Color conversion layer and display apparatus having the same

Abstract

Disclosed is a color conversion layer including at least one light emitting material including at least one composite particle surrounded partially or totally by at least one surrounding medium; wherein the light emitting material is configured to emit light in response to an excitation and the at least one composite particle includes a plurality of nanoparticles encapsulated in an inorganic material; and wherein the inorganic material has a difference of refractive index compared to the at least one surrounding medium superior or equal to 0.02 at 450 nm. Also disclosed is a display apparatus.

Claims

1. A color conversion layer (4) comprising at least one light emitting material (7) comprising at least one composite particle (1) surrounded partially or totally by at least one surrounding medium (71); wherein said at least one light emitting material (7) is configured to emit a secondary light in response to an excitation and the at least one composite particle (1) comprises a plurality of nanoparticles (3) encapsulated in an inorganic material (2); wherein said inorganic material (2) has a difference of refractive index compared to the at least one surrounding medium (71) superior or equal to 0.02 at 450 nm; and wherein a loading charge of nanoparticles (3) in a composite particle (1) is at least 10%, said loading charge being the mass ratio between the mass of nanoparticles comprised in a composite particle and the mass of said composite particle.

2. The color conversion layer (4) according to claim 1, wherein the inorganic material (2) limits or prevents the diffusion of outer molecular species or fluids (liquid or gas) into said inorganic material (2).

3. The color conversion layer (4) according to claim 1, wherein the at least one composite particle (1) in the at least one surrounding medium (71) is configured to scatter light.

4. The color conversion layer (4) according to claim 1, wherein the at least one composite particle (1) in the at least one surrounding medium (71) is configured to serve as a waveguide.

5. The color conversion layer (4) according to claim 1, wherein the color conversion layer (4) absorbs at least 70% of incident light on a thickness less or equal to 5 pm, wherein the incident light has a wavelength ranging from 370 to 470 nm.

6. The color conversion layer (4) according to claim 1, wherein the nanoparticles (3) comprised in the at least one composite particle (1) are semiconductor nanocrystals comprising a material of formula M.sub.xN.sub.yE.sub.zA.sub.w, wherein: M is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; N is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; E is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; A is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; and x, y, z and w are independently a decimal number from 0 to 5; x, y, z and w are not simultaneously equal to 0; x and y are not simultaneously equal to 0; z and w may not be simultaneously equal to 0.

7. The color conversion layer (4) according to claim 1, wherein the nanoparticles (3) comprised in the at least one composite particle (1) are semiconductor nanocrystals comprising at least one shell (34) comprising a material of formula M.sub.xN.sub.yE.sub.zA.sub.w, wherein: M is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; N is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; E is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; A is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; and x, y, z and w are independently a decimal number from 0 to 5; x, y, z and w are not simultaneously equal to 0; x and y are not simultaneously equal to 0; z and w may not be simultaneously equal to 0.

8. The color conversion layer (4) according to claim 1, wherein the nanoparticles (3) comprised in the at least one composite particle (1) are semiconductor nanocrystals comprising at least one crown (37) comprising a material of formula M.sub.xN.sub.yE.sub.zA.sub.w, wherein: M is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; N is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; E is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; A is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; and x, y, z and w are independently a decimal number from 0 to 5; x, y, z and w are not simultaneously equal to 0; x and y are not simultaneously equal to 0; z and w may not be simultaneously equal to 0.

9. The color conversion layer (4) according to claim 1, wherein the nanoparticles (3) comprised in the at least one composite particle (1) are semiconductor nanoplatelets.

10. The color conversion layer (4) according to claim 1, wherein the at least one surrounding medium (71) is optically transparent.

11. The color conversion layer (4) according to claim 1, wherein the at least one surrounding medium (71) has a thermal conductivity at standard conditions of at least 0.1 W/(m.Math.K).

12. The color conversion layer (4) according to claim 1, wherein the at least one surrounding medium (71) is a solid host material or a fluid.

13. A display apparatus (230) comprising: a. at least one light source (231); b. a rotating wheel (233) comprising at least two zones, wherein at least one zone comprises at least one color conversion layer (4) comprising at least one light emitting material (7) comprising at least one composite particle (1) surrounded partially or totally by at least one surrounding medium (71); wherein said at least one light emitting material (7) is configured to emit a secondary light in response to an excitation and the at least one composite particle (1) comprises a plurality of nanoparticles (3) encapsulated in an inorganic material (2); wherein said inorganic material (2) has a difference of refractive index compared to the at least one surrounding medium (71) superior or equal to 0.02 at 450 nm; and wherein a loading charge of nanoparticles (3) in a composite particle (1) is at least 10%, said loading charge being the mass ratio between the mass of nanoparticles comprised in a composite particle and the mass of said composite particle; and c. a modulating optical system (236); wherein the light source (231) is configured to provide excitation for the at least one color conversion layer (4) and wherein the modulating optical system (236) is configured to reflect the light emitted by the rotating wheel (233).

14. The display apparatus (230) according to claim 13, wherein the inorganic material (2) limits or prevents the diffusion of outer molecular species or fluids (liquid or gas) into said inorganic material (2).

15. The display apparatus (230) according to claim 13, wherein the at least one composite particle (1) in the at least one surrounding medium (71) is configured to scatter light.

16. The display apparatus (230) according to claim 13, wherein the at least one composite particle (1) in the at least one surrounding medium (71) is configured to serve as a waveguide.

17. The display apparatus (230) according to claim 13, wherein the color conversion layer (4) absorbs at least 70% of incident light on a thickness less or equal to 5 pm, wherein the incident light has a wavelength ranging from 370 to 470 nm.

18. The display apparatus (230) according to claim 13, wherein the nanoparticles (3) comprised in the at least one composite particle (1) are semiconductor nanocrystals comprising a material of formula M.sub.xN.sub.yE.sub.zA.sub.w, wherein: M is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; N is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; E is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; A is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; and x, y, z and w are independently a decimal number from 0 to 5; x, y, z and w are not simultaneously equal to 0; x and y are not simultaneously equal to 0; z and w may not be simultaneously equal to 0.

19. The display apparatus (230) according to claim 13, wherein the nanoparticles (3) comprised in the at least one composite particle (1) are semiconductor nanocrystals comprising at least one shell (34) comprising a material of formula M.sub.xN.sub.yE.sub.zA.sub.w, wherein: M is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; N is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; E is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; A is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; and x, y, z and w are independently a decimal number from 0 to 5; x, y, z and w are not simultaneously equal to 0; x and y are not simultaneously equal to 0; z and w may not be simultaneously equal to 0.

20. The display apparatus (230) according to claim 13, wherein the nanoparticles (3) comprised in the at least one composite particle (1) are semiconductor nanocrystals comprising at least one crown (37) comprising a material of formula M.sub.xN.sub.yE.sub.zA.sub.w, wherein: M is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; N is selected from the group consisting of Zn, Cd, Hg, Cu, Ag, Au, Ni, Pd, Pt, Co, Fe, Ru, Os, Mn, Tc, Re, Cr, Mo, W, V, Nd, Ta, Ti, Zr, Hf, Be, Mg, Ca, Sr, Ba, Al, Ga, In, Tl, Si, Ge, Sn, Pb, As, Sb, Bi, Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Cs or a mixture thereof; E is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; A is selected from the group consisting of O, S, Se, Te, C, N, P, As, Sb, F, Cl, Br, I, or a mixture thereof; and x, y, z and w are independently a decimal number from 0 to 5; x, y, z and w are not simultaneously equal to 0; x and y are not simultaneously equal to 0; z and w may not be simultaneously equal to 0.

21. The display apparatus (230) according to claim 13, wherein the nanoparticles (3) comprised in the at least one composite particle (1) are semiconductor nanoplatelets.

22. The display apparatus (230) according to claim 13, wherein the at least one surrounding medium (71) is optically transparent.

23. The display apparatus (230) according to claim 13, wherein the at least one surrounding medium (71) has a thermal conductivity at standard conditions of at least 0.1 W/(m.Math.K).

24. The display apparatus (230) according to claim 13, wherein the at least one surrounding medium (71) is a solid host material or a fluid.

25. The display apparatus (230) according to claim 13, wherein the modulating optical system (236) is configured to reflect the light emitted by the rotating wheel (233) to a screen.

26. The display apparatus (230) according to claim 13, further comprising a screen (238).

27. The display apparatus (230) according to claim 13, wherein the modulating optical system (236) is a digital micromirror device.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 illustrates a composite particle comprising a plurality of nanoparticles encapsulated in an inorganic material.

(2) FIG. 2A illustrates a composite particle comprising a plurality of spherical nanoparticles encapsulated in an inorganic material.

(3) FIG. 2B illustrates a composite particle comprising a plurality of 2D nanoparticles encapsulated in an inorganic material.

(4) FIG. 3 illustrates a composite particle comprising a plurality of spherical nanoparticles and a plurality of 2D nanoparticles encapsulated in an inorganic material.

(5) FIG. 4 illustrates a composite particle comprising a core comprising a plurality of 2D nanoparticles encapsulated in an inorganic material, and a shell comprising a plurality of spherical nanoparticles encapsulated in an inorganic material.

(6) FIG. 5A illustrates a core nanoparticle 33 without a shell.

(7) FIG. 5B illustrates a core 33/shell 34 nanoparticle 3 with one shell 34.

(8) FIG. 5C illustrates a core 33/shell (34, 35) nanoparticle 3 with two different shells (34, 35).

(9) FIG. 5D illustrates a core 33/shell (34, 35, 36) nanoparticle 3 with two different shells (34, 35) surrounded by an oxide insulator shell 36.

(10) FIG. 5E illustrates a core 33/crown 37 nanoparticle 32.

(11) FIG. 5F illustrates a sectional view of a core 33/shell 34 nanoparticle 32 with one shell 34.

(12) FIG. 5G illustrates a sectional view of a core 33/shell (34, 35) nanoparticle 32 with two different shells (34, 35).

(13) FIG. 5H illustrates a sectional view of a core 33/shell (34, 35, 36) nanoparticle 32 with two different shells (34, 35) surrounded by an oxide insulator shell 36.

(14) FIG. 6A illustrates a light emitting material 7 comprising a surrounding medium 71 and at least one composite particle 1 of the invention comprising a plurality of 2D nanoparticles 32 encapsulated in an inorganic material 2.

(15) FIG. 6B illustrates a light emitting material 7 comprising a surrounding medium 71; at least one composite particle 1 of the invention comprising a plurality of 2D nanoparticles 32 encapsulated in an inorganic material 2; a plurality of particles comprising an inorganic material 21; and a plurality of 2D nanoparticles 32.

(16) FIG. 7A illustrates a color conversion layer as described in the invention.

(17) FIG. 7B illustrates a color conversion layer as described in the invention.

(18) FIG. 7C illustrates a light emitting material comprising at least two surrounding media.

(19) FIG. 7D illustrates a light emitting material comprising at least two surrounding media.

(20) FIG. 8 illustrates a display apparatus wherein the color conversion layer is deposited onto a rotation wheel and is excited by a light source.

(21) FIG. 9 illustrates a display apparatus wherein the color conversion layer is deposited onto a rotation wheel and is excited by a light source.

(22) FIG. 10 illustrates a display apparatus wherein the color conversion layer is deposited onto a rotation wheel and is excited by a light source. Said rotation wheel is configured to work in a reflective mode.

(23) FIG. 11A illustrates a display apparatus comprising a digital micromirror device according to the invention.

(24) FIG. 11B illustrates a digital micromirror device according to the invention.

(25) FIG. 12A illustrates a a rotation wheel, wherein the color conversion layer forms a ring on said rotation wheel.

(26) FIG. 12B illustrates a a rotation wheel, wherein the color conversion layer forms a ring on said rotation wheel.

(27) FIG. 13A illustrates a display apparatus wherein the color conversion layer is deposited onto a rotation wheel to form a ring and is excited by a light source.

(28) FIG. 13B illustrates a display apparatus wherein the color conversion layer is deposited onto a rotation wheel to form a ring and is excited by a light source.

(29) FIG. 14A is TEM images showing CdSe/CdZnS nanoplatelets (dark contrast) uniformly dispersed in SiO.sub.2 (bright contrast—@SiO.sub.2).

(30) FIG. 14B is TEM images showing CdSe/CdZnS nanoplatelets (dark contrast) uniformly dispersed in SiO.sub.2 (bright contrast—@SiO.sub.2).

(31) FIG. 14C is TEM images showing CdSe/CdZnS nanoplatelets (dark contrast) uniformly dispersed in Al.sub.2O.sub.3 (bright contrast—@Al.sub.2O.sub.3).

(32) FIG. 15A shows the N.sub.2 adsorption isotherm of composite particles 1 CdSe/CdZnS@SiO.sub.2 prepared from a basic aqueous solution and from an acidic solution.

(33) FIG. 15B shows the N.sub.2 adsorption isotherm of composite particles 1 CdSe/CdZnS@Al.sub.2O.sub.3 obtained by heating droplets at 150° C., 300° C. and 550° C.

EXAMPLES

Example 1: Inorganic Nanoparticles Preparation

(34) Nanoparticles used in the examples herein were prepared according to methods of the art (Lhuillier E. et al., Acc. Chem. Res., 2015, 48 (1), pp 22-30; Pedetti S. et al., J. Am. Chem. Soc., 2014, 136 (46), pp 16430-16438; Ithurria S. et al., J. Am. Chem. Soc., 2008, 130, 16504-16505; Nasilowski M. et al., Chem. Rev. 2016, 116, 10934-10982).

(35) Nanoparticles used in the examples herein were selected in the group comprising CdSe/CdZnS, CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots.

Example 2: Exchange Ligands for Phase Transfer in Basic Aqueous Solution

(36) 100 μL of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with 3-mercaptopropionic acid and heated at 60° C. for several hours. The nanoparticles were then precipitated by centrifugation and redispersed in dimethylformamide. Potassium tert-butoxide were added to the solution before adding ethanol and centrifugate. The final colloidal nanoparticles were redispersed in water.

Example 3: Exchange Ligands for Phase Transfer in Acidic Aqueous Solution

(37) 100 μL of CdSe/CdZnS nanoplatelets suspended in a basic aqueous solution were mixed with ethanol and centrifugated. A PEG-based polymer was solubilized in water and added to the precipitated nanoplatelets. Acetic acid was dissolved in the colloidal suspension to control the acidic pH.

Example 4: Composite Particles Preparation from a Basic Aqueous Solution CdSe/CdZnS@SiO.SUB.2

(38) 100 μL of CdSe/CdZnS nanoplatelets suspended in a basic aqueous solution were mixed with a basic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded on a spray-drying set-up. The liquid mixture was sprayed towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(39) FIG. 14 A-B show TEM images of the resulting particles.

(40) FIG. 15 A shows the N.sub.2 adsorption isotherm of the resulting particles. Said resulting particles are porous.

(41) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(42) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 5: Composite Particles Preparation from an Acidic Aqueous Solution CdSe/CdZnS@SiO.SUB.2

(43) 100 μL of CdSe/CdZnS nanoplatelets suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded on a spray-drying set-up. The liquid mixture was sprayed towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(44) FIG. 15 A shows the N.sub.2 adsorption isotherm of the resulting particles. Said resulting particles are not porous.

(45) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(46) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 6: Composite Particles Preparation from a Basic Aqueous Solution with Hetero-Elements-CdSe/CdZnS@Si.SUB.x.Cd.SUB.y.Zn.SUB.z.O.SUB.w

(47) 100 μL of CdSe/CdZnS nanoplatelets suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours in presence of cadmium acetate at 0.01M and zinc oxide at 0.01M, then loaded on a spray-drying set-up. The liquid mixture was sprayed towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(48) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(49) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 7: Composite Particles Preparation from an Organic Solution and an Aqueous Solution CdSe/CdZnS@Al.SUB.2.O.SUB.3

(50) 100 μL of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with aluminium tri-sec butoxide and 5 mL of pentane, then loaded on a spray-drying set-up. On another side, a basic aqueous solution was prepared and loaded the same spray-drying set-up, but at a different location than the first heptane solution. The two liquids were sprayed simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(51) FIG. 14 C shows TEM images of the resulting particles.

(52) FIG. 15 B show N.sub.2 adsorption isotherms for particles obtained after heating the droplets at 150° C., 300° C. and 550° C. Increasing the heating temperature results in a loss of the porosity. Thus, particles obtained by heating at 150° C. are porous, whereas the particles obtained by heating at 300° C. and 550° C. are not porous.

(53) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(54) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

(55) The same procedure was carried out by replacing Al.sub.2O.sub.3 with ZnTe, SiO.sub.2, TiO.sub.2, HfO.sub.2, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

(56) The same procedure was carried out by replacing Al.sub.2O.sub.3 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 8: Composite Particles Preparation from an Organic Solution and an Aqueous Solution InP/ZnS@Al.SUB.2.O.SUB.3

(57) 4 mL of InP/ZnS nanoparticles suspended in heptane were mixed with aluminium tri-sec butoxide and 400 mL of heptane, then loaded in a spray-drying set-up. On another side, an acidic aqueous solution was prepared and loaded in the same spray-drying set-up, but at a different location than the first hexane solution. The two liquids were sprayed simultaneously with two different means for forming droplets towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(58) The same procedure was carried out by replacing InP/ZnS nanoparticles with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(59) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

(60) The same procedure was carried out by replacing Al.sub.2O.sub.3 with SiO.sub.2, TiO.sub.2, HfO.sub.2, ZnTe, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

(61) The same procedure was carried out by replacing Al.sub.2O.sub.3 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 9: Composite Particles Preparation from an Organic Solution and an Aqueous Solution CH.SUB.5.N.SUB.2.—PbBr.SUB.3.@Al.SUB.2.O.SUB.3

(62) 100 μL of CH.sub.5N.sub.2—PbBr.sub.3 nanoparticles suspended in hexane were mixed with aluminium tri-sec butoxide and 5 mL of hexane, then loaded in a spray-drying set-up. On another side, an acidic aqueous solution was prepared and loaded in the same spray-drying set-up, but at a different location than the first hexane solution. The two liquids were sprayed simultaneously with two different means for forming droplets towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(63) The same procedure was carried out by replacing Al.sub.2O.sub.3 with SiO.sub.2, TiO.sub.2, HfO.sub.2, ZnTe, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

(64) The same procedure was carried out by replacing Al.sub.2O.sub.3 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 10: Composite Particles Preparation from an Organic Solution and an Aqueous Solution CdSe/CdZnS—Au@SiO.SUB.2

(65) On one side, 100 μL of gold nanoparticles and 100 μL of CdSe/CdZnS nanoplatelets suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded in a spray-drying set-up. The supension was sprayed towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The composite particles were collected at the surface of a GaN substrate. The GaN substrate with the deposited composite particles was then cut into pieces of 1 mm×1 mm and electricaly connected to get a LED emitting a mixture of the blue light and the light emitted by the fluorescent nanoparticles.

(66) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(67) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

(68) The same procedure was carried out by replacing SiO.sub.2 with Al.sub.2O.sub.3, TiO.sub.2, HfO.sub.2, ZnTe, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

(69) The same procedure was carried out by replacing SiO.sub.2 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 11: Composite Particles Preparation from an Organic Solution and an Aqueous Solution Fe.SUB.3.O.SUB.4.@Al.SUB.2.O.SUB.3.—CdSe/CdZnS@SiO.SUB.2

(70) On one side, 100 μL of Fe.sub.3O.sub.4 nanoparticles suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours. On another side, 100 μL of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with aluminium tri-sec butoxide and 5 mL of heptane, then loaded on the same spray-drying set-up, but at a different location than the first aqueous solution. The two liquids were sprayed simultaneously with two different means for forming droplets towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The composite particles were collected at the surface of a filter. The composite particles comprise a core of silica containing Fe.sub.3O.sub.4 nanoparticles and a shell of alumina containing CdSe/CdZnS nanoplatelets.

(71) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(72) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

(73) The same procedure was carried out by replacing Al.sub.2O.sub.3 and/or SiO.sub.2 with TiO.sub.2, SiO.sub.2, Al.sub.2O.sub.3, HfO.sub.2, ZnTe, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

(74) The same procedure was carried out by replacing Al.sub.2O.sub.3 and/or SiO.sub.2 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 12: Composite Particles Preparation from an Organic Solution and an Aqueous Solution CdS/ZnS Nanoplatelets@Al.SUB.2.O.SUB.3

(75) 4 mL of CdS/ZnS nanoplatelets suspended in heptane were mixed with aluminium tri-sec butoxide and 400 mL of heptane, then loaded in a spray-drying set-up. On another side, an acidic aqueous solution was prepared and loaded in the same spray-drying set-up, but at a different location than the first hexane solution. The two liquids were sprayed simultaneously with two different means for forming droplets towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(76) The same procedure was carried out by replacing CdS/ZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/CdZnS, CdTe/ZnS, CdSe/CdZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(77) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

(78) The same procedure was carried out by replacing Al.sub.2O.sub.3 with SiO.sub.2, HfO.sub.2, TiO.sub.2, ZnTe, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

(79) The same procedure was carried out by replacing Al.sub.2O.sub.3 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 13: Composite Particles Preparation from an Organic Solution and an Aqueous Solution InP/ZnS@SiO.SUB.2

(80) 4 mL of InP/ZnS nanoparticles suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded in a spray-drying set-up. The suspension was sprayed for forming droplets towards a tube furnace heated a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(81) The same procedure was carried out by replacing InP/ZnS nanoparticles with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, CdSe/CdZnS, InP/CdS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(82) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

(83) The same procedure was carried out by replacing SiO.sub.2 with Al.sub.2O.sub.3, HfO.sub.2, TiO.sub.2, ZnTe, ZnSe, ZnO, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

(84) The same procedure was carried out by replacing SiO.sub.2 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 14: Particles Preparation from an Organic Solution and an Aqueous Solution, Followed by a Treatment of Ammonia Vapors CdSe/CdZnS@ZnO

(85) 100 μL of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with zinc methoxyethoxide and 5 mL of pentane, then loaded on a spray-drying set-up as described in the invention. On another side, a basic aqueous solution was prepared and loaded on the same spray-drying set-up, but at a different location than the first heptane solution. On another side, an ammonium hydroxide solution was loaded on the same spray-drying system, between the tube furnace and the filter. The two first liquids were sprayed while the third one was heated at 35° C. by an external heating system to produce ammonia vapors, simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The particles were collected at the surface of a filter.

(86) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(87) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

(88) The same procedure was carried out by replacing ZnO with SiO.sub.2, HfO.sub.2, TiO.sub.2, Al.sub.2O.sub.3, ZnTe, ZnSe, ZnS or MgO, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

(89) The same procedure was carried out by replacing ZnO with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the inorganic material chosen.

Example 15: Particles Preparation from an Organic Solution and an Aqueous Solution, Followed by an Extra Shell Coating CdSe/CdZnS@Al.SUB.2.O.SUB.3.@MgO

(90) 100 μL of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with zinc methoxyethoxide and 5 mL of pentane, then loaded on a spray-drying set-up as described in the invention. On another side, a basic aqueous solution was prepared and loaded on the same spray-drying set-up, but at a different location than the first heptane solution. The two liquids were sprayed simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The particles were directed towards a tube where an extra MgO shell was coated at the surface of the particles by an ALD process, said particles being suspended in the gas. The particles were finally collected on the inner wall of the tube where the ALD was performed.

(91) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(92) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 16: Particles Preparation from an Organic Solution and an Aqueous Solution CdSe/CdZnS—Fe.SUB.3.O.SUB.4.@SiO.SUB.2

(93) On one side, 100 μL of Fe.sub.3O.sub.4nanoparticles and 100 μL of CdSe/CdZnS nanoplatelets suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded in a spray-drying set-up as described in the invention. On another side, an acidic aqueous solution was prepared and loaded on the same spray-drying set-up, but at a different location than the first heptane solution. The two liquids were sprayed simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The particles were collected at the surface of a filter.

(94) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(95) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 17: Core/Shell Particles Preparation from an Organic Solution and an Aqueous Solution Au@Al.SUB.2.O.SUB.3 .in the Core and CdSe/CdZnS@SiO.SUB.2 .in the Shell

(96) On one side, 100 μL of CdSe/CdZnS nanoplatelets suspended in an acidic aqueous solution were mixed with an acidic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded on a spray-drying set-up as described in the invention. On another side, 100 μL of Au nanoparticles suspended in heptane were mixed with aluminium tri-sec butoxide and 5 mL of heptane, then loaded on the same spray-drying set-up, but at a different location than the first aqueous solution. The two liquids were sprayed simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The particles were collected at the surface of a filter. The particles comprise a core of alumina containing gold nanoparticles and a shell of silica containing CdSe/CdZnS nanoplatelets.

(97) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(98) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 18: Composite Particles Preparation—Phosphor Nanoparticles@SiO.SUB.2

(99) Phosphor nanoparticles were suspended in a basic aqueous solution were mixed with a basic aqueous solution of TEOS at 0.13M previously hydrolyzed for 24 hours, then loaded on a spray-drying set-up. The liquid mixture was sprayed towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(100) Phosphor nanoparticles used for this example were: Yttrium aluminium garnet nanoparticles (YAG, Y.sub.3Al.sub.5O.sub.12), (Ca,Y)-α-SiAlON:Eu nanoparticles, ((Y,Gd).sub.3(Al,Ga).sub.5O.sub.12:Ce) nanoparticles, CaAlSiN.sub.3:Eu nanoparticles, sulfide-based phosphor nanoparticles, PFS:Mn.sup.4+ nanoparticles (potassium fluorosilicate).

Example 19: Composite Particles Preparation—Phosphor Nanoparticles@Al.SUB.2.O.SUB.3

(101) Phosphor nanoparticles were suspended in heptane were mixed with aluminium tri-sec butoxide and 400 mL of heptane, then loaded in a spray-drying set-up. On another side, an acidic aqueous solution was prepared and loaded in the same spray-drying set-up, but at a different location than the first hexane solution. The two liquids were sprayed simultaneously with two different means for forming droplets towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(102) Phosphor nanoparticles used for this example were: Yttrium aluminium garnet nanoparticles (YAG, Y.sub.3Al.sub.5O.sub.12), (Ca,Y)-α-SiAlON:Eu nanoparticles, ((Y,Gd).sub.3(Al,Ga).sub.5O.sub.12:Ce) nanoparticles, CaAlSiN.sub.3:Eu nanoparticles, sulfide-based phosphor nanoparticles, PFS:Mn.sup.4+ nanoparticles (potassium fluorosilicate).

Example 20: Composite Particles Preparation—CdSe/CdZnS@HfO.SUB.2

(103) 100 μL of CdSe/CdZnS nanoplatelets suspended in heptane (10 mg/mL) were mixed with Hafnium n-butoxide and 5 mL of pentane, then loaded on a spray-drying set-up. On another side, a basic aqueous solution was prepared and loaded on the same spray-drying set-up, but at a different location than the first heptane solution. The two liquids were sprayed simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. Composite particles were collected at the surface of a filter.

(104) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(105) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

Example 21: Composite Particles Preparation—Phosphor Nanoparticles@HfO.SUB.2

(106) 1 μm of phosphor nanoparticles (cf. list below) suspended in heptane (10 mg/mL) were mixed with hafnium n-butoxide and 5 mL of pentane, then loaded on a spray-drying set-up. On another side, an aqueous solution was prepared and loaded on the same spray-drying set-up, but at a different location than the first heptane solution. The two liquids were sprayed simultaneously towards a tube furnace heated at a temperature ranging from the boiling point of the solvent to 1000° C. with a nitrogen flow. The resulting particles phosphors particles@HfO.sub.2 were collected at the surface of a filter.

(107) Phosphor nanoparticles used for this example were: Yttrium aluminium garnet nanoparticles (YAG, Y.sub.3Al.sub.5O.sub.12), (Ca,Y)-α-SiAlON:Eu nanoparticles, ((Y,Gd).sub.3(Al,Ga).sub.5O.sub.12:Ce) nanoparticles, CaAlSiN.sub.3:Eu nanoparticles, sulfide-based phosphor nanoparticles, PFS:Mn.sup.4+ nanoparticles (potassium fluorosilicate).

Example 22: Composite Particles Preparation from an Organometallic Precursor

(108) 100 μL of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with an organometallic precursor selected in the group below in pentane under controlled atmosphere, then loaded on a spray-drying set-up. On another side, an aqueous solution was prepared and loaded on the same spray-drying set-up, but at a different location than the first heptane solution. The two liquids were sprayed simultaneously towards a tube furnace heated from room temperature to 300° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(109) The procedure was carried out with an organometallic precursor selected in the group comprising: Al[N(SiMe.sub.3).sub.2].sub.3, trimethyl aluminium, triisobutylaluminum, trioctylaluminum, triphenylaluminum, dimethyl aluminium, trimethyl zinc, dimethyl zinc, diethylzinc, Zn[(N(TMS).sub.2].sub.2, Zn[(CF.sub.3SO.sub.2).sub.2N].sub.2, Zn(Ph).sub.2, Zn(C.sub.6F.sub.5).sub.2, Zn(TMHD).sub.2 (β-diketonate), Hf[C.sub.5H.sub.4(CH.sub.3)].sub.2(CH.sub.3).sub.2, HfCH.sub.3(OCH.sub.3)[C.sub.5H.sub.4(CH.sub.3)].sub.2, [[(CH.sub.3).sub.3Si].sub.2N].sub.2HfCl.sub.2, (C.sub.5H.sub.5).sub.2Hf(CH.sub.3).sub.2, [(CH.sub.2CH.sub.3).sub.2N].sub.4Hf, [(CH.sub.3).sub.2N].sub.4Hf, [(CH.sub.3).sub.2N].sub.4Hf, [(CH.sub.3)(C.sub.2H.sub.5)N].sub.4Hf, [(CH.sub.3)(C.sub.2H.sub.5)N].sub.4Hf, 2,2′,6,6′-tetramethyl-3,5-heptanedione zirconium (Zr(THD).sub.4), C.sub.10H.sub.12Zr, Zr(CH.sub.3C.sub.5H.sub.4).sub.2CH.sub.3OCH.sub.3, C.sub.22H.sub.36Zr, [(C.sub.2H.sub.5).sub.2N].sub.4Zr, [(CH.sub.3).sub.2N].sub.4Zr, [(CH.sub.3).sub.2N].sub.4Zr, Zr(NCH.sub.3C.sub.2H.sub.5).sub.4, Zr(NCH.sub.3C.sub.2H.sub.5).sub.4, C.sub.18H.sub.32O.sub.6Zr, Zr(C.sub.8H.sub.15O.sub.2).sub.4, Zr(OCC(CH.sub.3).sub.3CHCOC(CH.sub.3).sub.3).sub.4, Mg(C.sub.5H.sub.5).sub.2, or C.sub.20H.sup.30Mg, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the organometallic precursor chosen.

(110) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(111) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

(112) The same procedure was carried out by replacing Al.sub.2O.sub.3 with ZnO, MgO, TiO.sub.2, HfO.sub.2 or ZrO.sub.2. The same procedure was carried out by replacing Al.sub.2O.sub.3 with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof.

(113) The same procedure was carried out by replacing the aqueous solution with another liquid or vapor source of oxidation.

Example 23: Composite Particles Preparation from an Organometallic Precursor CdSe/CdZnS@ZnTe

(114) 100 μL of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with two organometallic precursors selected in the group below in pentane under inert atmosphere then loaded on a spray-drying set-up. The suspension was sprayed towards a tube furnace heated from RT to 300° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(115) The procedure was carried out by with a first organometallic precursor selected in the group comprising: dimethyl telluride, diethyl telluride, diisopropyl telluride, di-t-butyl telluride, diallyl telluride, methyl allyl telluride, or dimethyl sulfur, or a mixture thereof. Reaction temperature of the above procedure is adapted according to the organometallic precursor chosen.

(116) The procedure was carried out by with a second organometallic precursor selected in the group comprising: dimethyl zinc, trimethyl zinc, diethylzinc, Zn[(N(TMS).sub.2].sub.2, Zn[(CF.sub.3SO.sub.2).sub.2N].sub.2, Zn(Ph).sub.2, Zn(C.sub.6F.sub.5).sub.2, or Zn(TMHD).sub.2 (β-diketonate), or a mixture thereof. Reaction temperature of the above procedure is adapted according to the organometallic precursor chosen.

(117) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS2/ZnS, CuInSe2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnSe, InP/CdZnS, CdSe/CdZnS/ZnS, CdSe/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(118) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

(119) The same procedure was carried out by replacing ZnTe with ZnS or ZnSe, or a mixture thereof.

(120) The same procedure was carried out by replacing ZnTe with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof.

Example 24: Composite Particles Preparation from an Organometallic Precursor CdSe/CdZnS@ZnS

(121) 100 μL of CdSe/CdZnS nanoplatelets suspended in heptane were mixed with an organometallic precursor selected in the group below in pentane under inert atmosphere, then loaded on a spray-drying set-up. On another side, a vapor source of H.sub.2S was inserted in the same spray-drying set-up. The suspension was sprayed towards a tube furnace heated from RT to 300° C. with a nitrogen flow. The composite particles were collected at the surface of a filter.

(122) The procedure was carried out with an organometallic precursor selected in the group omprising: dimethyl zinc, trimethyl zinc, diethylzinc, Zn[(N(TMS).sub.2].sub.2, Zn[(CF.sub.3SO.sub.2).sub.2N].sub.2, Zn(Ph).sub.2, Zn(C.sub.6F.sub.5).sub.2, Zn(TMHD).sub.2 (β-diketonate), or a mixture thereof. Reaction temperature of the above procedure is adapted according to the organometallic precursor chosen.

(123) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with CdSe, CdS, CdTe, CdSe/CdS, CdSe/ZnS, CdSe/CdZnS, CdS/ZnS, CdS/CdZnS, CdTe/ZnS, CdTe/CdZnS, CdSeS/ZnS, CdSeS/CdS, CdSeS/CdZnS, CuInS.sub.2/ZnS, CuInSe.sub.2/ZnS, InP/CdS, InP/ZnS, InZnP/ZnS, InP/ZnSeS, InP/ZnS e, InP/CdZnS, CdSe/CdZnS/ZnS, CdS e/ZnS/CdZnS, CdSe/CdS/ZnS, CdSe/CdS/CdZnS, CdSe/ZnSe/ZnS, CdSeS/CdS/ZnS, CdSeS/CdS/CdZnS, CdSeS/CdZnS/ZnS, CdSeS/ZnSe/ZnS, CdSeS/ZnSe/CdZnS, CdSeS/ZnS/CdZnS, CdSe/ZnS/CdS, CdSeS/ZnS/CdS, CdSe/ZnSe/CdZnS, InP/ZnSe/ZnS, InP/CdS/ZnSe/ZnS, InP/CdS/ZnS, InP/ZnS/CdS, InP/GaP/ZnS, InP/GaP/ZnSe, InP/CdZnS/ZnS, InP/ZnS/CdZnS, InP/CdS/CdZnS, InP/ZnSe/CdZnS, InP/ZnS/ZnSe, InP/GaP/ZnSe/ZnS, InP/ZnS/ZnSe/ZnS, nanoplatelets or quantum dots, or a mixture thereof.

(124) The same procedure was carried out by replacing CdSe/CdZnS nanoplatelets with organic nanoparticles, inorganic nanoparticles such as metal nanoparticles, halide nanoparticles, chalcogenide nanoparticles, phosphide nanoparticles, sulfide nanoparticles, metalloid nanoparticles, metallic alloy nanoparticles, phosphor nanoparticles, perovskite nanoparticles, ceramic nanoparticles such as for example oxide nanoparticles, carbide nanoparticles, nitride nanoparticles, or a mixture thereof.

(125) The same procedure was carried out by replacing ZnS with ZnSe or ZnTe, or a mixture thereof.

(126) The same procedure was carried out by replacing ZnS with a metal material, halide material, chalcogenide material, phosphide material, sulfide material, metalloid material, metallic alloy material, ceramic material such as for example oxide, carbide, nitride, glass, enamel, ceramic, stone, precious stone, pigment, cement and/or inorganic polymer, or a mixture thereof.

(127) The same procedure was carried out by replacing H.sub.2S with H.sub.2Se, H.sub.2Te or other gas.

Example 25: Color Conversion Layer Preparation

(128) Blue emitting composite particles comprising core-shell CdS/ZnS nanoplatelets encapsulated in Al.sub.2O.sub.3, green emitting composite particles comprising CdSeS/CdZnS nanoplatelets encapsulated in Al.sub.2O.sub.3, and red emitting composite particles comprising core-shell CdSe/CdZnS nanoplatelets encapsulated in Al.sub.2O.sub.3 were dispersed separately in silicone and successively deposited onto an optically transparent rotating wheel with a ring shape, such that the film of composite particles is around 50-150 μm in thickness and were equally distributed in three zones along the ring to obtain one zone coated with green emitting composite particles, one zone coated with blue emitting composite particles and one zone coated with red emitting composite particles. The rotating wheel was then annealed at 150° C. for 2 hours before it was introduced in the display apparatus described in the invention, wherein a UV laser source was used as excitation source. The resulting lights were blue, green and red depending on the zone illuminated with the UV light form the laser source.

(129) The same procedure was carried out by replacing silicone with a resin, ZnO, MgO, PMMA, Polystyrene, Al.sub.2O.sub.3, TiO.sub.2, HfO.sub.2 or ZrO.sub.2, or a mixture thereof.

(130) The same procedure was carried out with composite particles prepared in the examples hereabove.

Example 26: Color Conversion Layer Preparation

(131) Green emitting core-shell CdSeS/CdZnS nanoplatelets and red emitting core-shell CdSe/CdZnS nanoplatelets were dispersed separately in silicone and successively deposited onto an optically transparent rotating wheel with a ring shape, such that the film of composite particles is around 50-150 μm in thickness and were equally distributed in three zones along the ring, to obtain one zone not coated, one zone coated with green emitting core-shell CdSe/CdZnS nanoplatelets and one zone coated with red emitting core-shell CdSe/CdZnS nanoplatelets. The rotating wheel was then annealed at 150° C. for 2 hours before it was introduced in the display apparatus described in the invention, where a blue laser source was used as excitation source. The resulting lights were blue, green and red depending on the zone illuminated with the blue light form the laser source.

(132) The same procedure was carried out by replacing silicone with a resin, ZnO, MgO, PMMA, Polystyrene, Al.sub.2O.sub.3, TiO.sub.2, HfO.sub.2 or ZrO.sub.2, or a mixture thereof.

(133) The same procedure was carried out with composite particles prepared in the examples hereabove.

Example 27: Color Conversion Layer Preparation

(134) Green emitting composite particles comprising core-shell CdSeS/CdZnS nanoplatelets encapsulated in Al.sub.2O.sub.3, and red emitting composite particles comprising core-shell CdSe/CdZnS nanoplatelets encapsulated in Al.sub.2O.sub.3 were dispersed separately in a zinc oxide matrix and successively deposited onto an optically transparent rotating wheel with a ring shape, such that the film of composite particles is around 50-150 μm in thickness and were equally distributed in three zones along the ring, to obtain one zone not coated, one zone coated with green emitting composite particles and one zone coated with red emitting composite particles. The rotating wheel was then annealed at 150° C. for 2 hours before it was introduced in the display apparatus described in the invention, where a blue laser source was used as excitation source. The resulting lights were blue, green and red depending on the zone illuminated with the blue light form the laser source.

(135) The same procedure was carried out by replacing ZnO with a resin, silicone, MgO, PMMA, Polystyrene, Al.sub.2O.sub.3, TiO.sub.2, HfO.sub.2 or ZrO.sub.2, or a mixture thereof.

(136) The same procedure was carried out with composite particles prepared in the examples hereabove.

Example 28: Color Conversion Layer Preparation

(137) Green emitting composite particles comprising a core with gold nanoparticles encapsulated in SiO.sub.2 and a shell with core-shell CdSeS/ZnS nanoplatelets encapsulated in Al.sub.2O.sub.3, and red emitting composite particles comprising a core with gold nanoparticles encapsulated in SiO.sub.2 and a shell with core-shell CdSeS/CdZnS nanoplatelets encapsulated in Al.sub.2O.sub.3 were dispersed separately in a resin matrix and successively deposited onto an optically transparent rotating wheel with a ring shape, such that the film of composite particles is around 50-150 μm in thickness and were equally distributed in three zones along the ring, to obtain one zone not coated, one zone coated with green emitting composite particles and one zone coated with red emitting composite particles. The rotating wheel was then annealed at 150° C. for 2 hours before it was introduced in the display apparatus described in the invention, where a blue laser source was used as excitation source. The resulting lights were blue, green and red depending on the zone illuminated with the blue light form the laser source.

(138) The same procedure was carried out by replacing the resin with silicone, ZnO, MgO, PMMA, Polystyrene, Al.sub.2O.sub.3, TiO.sub.2, HfO.sub.2 or ZrO.sub.2, or a mixture thereof.

(139) The same procedure was carried out with composite particles prepared in the examples hereabove.

Example 29: Color Conversion Layer Preparation

(140) Green emitting composite particles comprising core-shell CdSeS/CdZnS nanoplatelets encapsulated in SiO.sub.2, yellow emitting composite particles comprising core-shell InP/ZnS quantum dots encapsulated in SiO.sub.2, orange emitting composite particles comprising core-shell CdSeS/CdZnS nanoplatelets encapsulated in SiO.sub.2, and red emitting composite particles comprising core-shell InP/ZnSe/ZnS quantum dots encapsulated in SiO.sub.2 were dispersed separately in silicone and deposited onto an optically transparent rotating wheel with a ring shape, such that the film of composite particles is around 50-150 μm in thickness and were equally distributed in five zones along the ring, to obtain one zone not coated, one zone coated with green emitting composite particles, one zone coated with yellow emitting composite particles, one zone coated with orange emitting composite particles and one zone coated with red emitting composite particles. The rotating wheel was then annealed at 150° C. for 2 hours before it was introduced in the display apparatus described in the invention, where a blue laser source was used as excitation source. The resulting lights were blue, green, yellow, orange and red depending on the zone illuminated with the blue light form the laser source.

(141) The same procedure was carried out by replacing silicone with a resin, ZnO, MgO, PMMA, Polystyrene, Al.sub.2O.sub.3, TiO.sub.2, HfO.sub.2 or ZrO.sub.2, or a mixture thereof.

(142) The same procedure was carried out with composite particles prepared in the examples hereabove.

REFERENCES

(143) 1—Composite particle 11—Core of composite particle 12—Shell of composite particle 2—Inorganic material 21—Inorganic material 3—Nanoparticle 31—Spherical nanoparticle 32—2D nanoparticle 33—Core of a nanoparticle 34—Shell of a nanoparticle 35—Shell of a nanoparticle 36—Insulator shell of a nanoparticle 37—Crown of a nanoparticle 4—Color conversion layer 7—Light emitting material 71—Surrounding medium 72—Surrounding medium 230—Display apparatus 231—Light source 232—Possible light path of primary light from the light source 233—Rotating wheel comprising at least a zone comprising a color conversion layer 234—Possible light paths of secondary or primary light 235—Optical component 236—Modulating optical system 237—Possible path of the formed image 238—Screen 239—Digital micromirror device 2391—Microscopic mirror of the digital micromirror device 2392—Microscopic mirror of the digital micromirror device free of light emitting material, empty or optically transparent 2393—Support of a microscopic mirror 24—Wavelength splitter system 25—Wavelength combiner system 26—Mirror