There are provided green-emitting quantum dots (QDs) including I-III-VI type ternary CuGaS core QDs and ZnS multishell wherein Cu:Ga is 1:10 to 1:1, and a fabricating method thereof. Integration of these QDs and red-emitting QDs into a blue LED leads to the fabrication of a white light-emitting device with high color rendering index. There are also provided blue-emitting QDs including I-III-VI type quaternary ZnCuGaS or CuGaAlS core QDs and ZnS multishell, and a fabricating method thereof. An electrically-driven blue light-emitting device with a QD emitting layer including these QDs interposed between a hole transport layer and an electron transport layer is fabricated.

The invention relates to a mineral wool product comprising mineral fibers that is marked with an UV or IR active substance and can therefore be identified under exposure to suitable radiation.

Disclosed herein are composite materials that comprise one or more nanophosphors capable of converting higher frequency, lower wavelength radiation into visible light. As used, the produced visible light enhances the amount of visible light already present from natural or artificial sources.

A semiconductor nanocrystal can have a photoluminescent quantum yield of at least 90%, at least 95%, or at least 98%. The nanocrystal can be made by sequentially contacting a nanocrystal core with an M-containing compound and an X donor, where at least one of the M-containing compound and the X donor is substoichiometric with respect to forming a monolayer on the nanocrystal core.

A security feature is presented for a security or value document. The security feature comprises a zinc sulfide luminophore in the form of particles. The zinc sulfide luminophore has the general chemical formula ZnS:Cu.sub.x, M.sub.y, X.sub.z; here, M represents one or more elements from a group comprising the chemical elements Co, In and Ni; X represents one or more elements from a group comprising the halides F, Cl, Br and I; and the following applies: 0<x<0.002 and 0::; y<0.00015 and 0::; z<0.00050. The particles each have cubic phase portions and hexagonal phase portions. When excited by an electrical field, the zinc sulfide luminophore emits a first radiation in the range of the light spectrum between 580 nm and 780 nm. When excited by heating the luminophore to a temperature between 100? C. and 150? C., the zinc sulfide luminophore emits a second radiation in the light spectrum.

The present invention provides a CuInS.sub.2/In.sub.2S.sub.3/ZnS fluorescent quantum dot with a double-layer core-shell structure, aiming to overcome the defects of the existing CuInS.sub.2 quantum dots. CuInS.sub.2 serves as a core, In.sub.2S.sub.3 serves as a first shell for cladding the core, and ZnS serves as a second shell for cladding the first shell. The present invention further provides a preparation method for the CuInS.sub.2/In.sub.2S.sub.3/ZnS fluorescent quantum dot with a double-layer core-shell structure. The CuInS.sub.2 quantum dot is synthesized using two stabilizers, and indium thiophosphate serves as a monomolecular precursor of the In.sub.2S.sub.3 shell.

There are provided green-emitting quantum dots (QDs) including I-III-VI type ternary CuGaS core QDs and ZnS multishell wherein Cu:Ga is 1:10 to 1:1, and a fabricating method thereof. Integration of these QDs and red-emitting QDs into a blue LED leads to the fabrication of a white light-emitting device with high color rendering index. There are also provided blue-emitting QDs including I-III-VI type quaternary ZnCuGaS or CuGaAlS core QDs and ZnS multishell, and a fabricating method thereof. An electrically-driven blue light-emitting device with a QD emitting layer including these QDs interposed between a hole transport layer and an electron transport layer is fabricated.

The present disclosure describes luminescent solar concentrators that include photoluminescent nanoparticles. The photoluminescent nanoparticles include a semiconductor nanocrystal that sensitizes the luminescence of a defect. The defect can include, for example, an atom, a cluster of atoms, or a lattice vacancy. The defect can be incorporated into the semiconductor nanocrystal, adsorbed onto, or otherwise associated with the surface of the semiconductor nanocrystal.

In various embodiments the present disclosure provides a core/shell nanocrystal comprising a core and a shell formed on the core, wherein the core/shell nanocrystal is co-doped with at least one metal dopant and at least one trivalent cation. In some embodiments, the trivalent cation is a Group 13 element. Methods of making and using the core/shell nanocrystal are also described.

A method of forming an alkaline-earth metal selenide and/or sulfide compound is disclosed as including reacting a carbonate of an alkaline-earth metal with zinc selenide (ZnSe) and/or zinc sulfide (ZnS) in a mixture atmosphere of hydrogen gas (H.sub.2) (10 vol. %) and nitrogen gas (N.sub.2) at a temperature between about 1,100? C. and about 1,400? C. for not more than about 1 hour.