Light-emitting film

Abstract

The present application relates to a light-emitting film, a method of manufacturing the same, a lighting device and a display device. The present application may provide a light-emitting film capable of providing a lighting device having excellent color purity and efficiency and an excellent color characteristic. The characteristics of the light-emitting film of the present application may be stably and excellently maintained for a long time. The light-emitting film of the present application may be used for various uses including photovoltaic applications, an optical filter or an optical converter, as well as various lighting devices.

Claims

1. A light-emitting film, comprising: an emulsion region dispersed in a matrix having a continuous phase; and a light-emitting layer including light-emitting nanoparticles, which are present in the continuous phase or emulsion region.

2. The film of claim 1, wherein the light-emitting nanoparticles are included in the emulsion region.

3. The film of claim 2, wherein a ratio of the light-emitting nanoparticles included in the emulsion region is 90 wt % or more with respect to a total of the light-emitting nanoparticles included in the light-emitting layer.

4. The film of claim 1, wherein the light-emitting nanoparticles are capable of absorbing light with any one wavelength in a range of 420 to 490 nm and emitting light with any one wavelength in a range of 490 to 580 nm or 580 to 780 nm.

5. The film of claim 1, wherein the light-emitting layer are quantum dots.

6. The film of claim 1, wherein the emulsion region is in a particle type.

7. The film of claim 6, wherein the particle type has an average diameter in a range of 1 to 200 m.

8. The film of claim 1, wherein the light-emitting layer includes 5 to 40 parts by weight of the emulsion region with respect to 100 parts by weight of the matrix.

9. The film of claim 1, wherein any one of the matrix and the emulsion region includes a polymer component having a solubility parameter of less than 10 (cal/cm.sup.3).sup.1/2, and the other includes a polymer component having a solubility parameter of 10 (cal/cm.sup.3).sup.1/2 or more.

10. The film of claim 1, wherein the matrix includes a polymerization unit of a compound of Formula 1, a compound of Formula 2, a compound of Formula 3, a compound of Formula 4, a nitrogen-containing radical polymerizable compound, or a radical polymerizable compound including an acrylic acid, a methacrylic acid or a salt thereof: ##STR00008## In Formula 1, Q is hydrogen or an alkyl group, U is an alkylene group, Z is hydrogen, an alkoxy group, an epoxy group or a monovalent hydrocarbon group, and m is an arbitrary number: ##STR00009## In Formula 2, Q is hydrogen or an alkyl group, U is an alkylene group, and m is an arbitrary number: ##STR00010## In Formula 3, Q is hydrogen or an alkyl group, A is an alkylene group which may be substituted with a hydroxyl group, and U is an alkylene group: ##STR00011## In Formula 4, Q is hydrogen or an alkyl group, A and U are each independently an alkylene group, and X is a hydroxyl group or a cyano group.

11. The film of claim 1, wherein the emulsion region includes a polymerization unit of a compound represented by any one of Formulas 5 to 7: ##STR00012## In Formula 5, Q is hydrogen or an alkyl group, and B is a linear or branched alkyl group or alicyclic hydrocarbon group, which has 5 or more carbon atoms: ##STR00013## In Formula 6, Q is hydrogen or an alkyl group, and U is an alkylene, alkenylene, alkynylene or arylene group: ##STR00014## In Formula 7, Q is hydrogen or an alkyl group, U is an alkylene group, Y is a carbon atom, an oxygen atom or a sulfur atom, X is an oxygen atom, a sulfur atom or an alkylene group, Ar is an aryl group, and n is an arbitrary number.

12. The film of claim 1, wherein the light-emitting layer further includes an antioxidant.

13. The film of claim 12, wherein the antioxidant includes oxidizable metal particles.

14. The film of claim 12, wherein the antioxidant is a phenol-based antioxidant, a thioether-based antioxidant, a phosphate-based antioxidant or an amine-based antioxidant.

15. A method of manufacturing the light-emitting layer of claim 1, comprising: polymerizing a layer including a mixture of a polymerizable compound capable of forming a polymer having a solubility parameter of 10 (cal/cm.sup.3).sup.1/2 or more and a polymerizable compound capable of forming a polymer having a solubility parameter of less than 10 (cal/cm.sup.3).sup.1/2.

16. A lighting device, comprising: a light source; and the light-emitting film of claim 1, wherein the light source and the light-emitting film are disposed such that light emitted from the light source is incident into the light-emitting film.

17. The device of claim 16, wherein the light source emits light with any one wavelength in a range of 420 to 490 nm.

18. A display device comprising the lighting device of claim 16.

Description

DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a cross-sectional view of an exemplary light-emitting film.

(2) FIGS. 2 and 3 are schematic diagrams of an exemplary lighting device.

(3) FIG. 4 is an image of the light-emitting layer manufactured according to Example 1.

(4) FIGS. 5 to 7 are evaluation results for light-emitting films according to examples and comparative examples.

EXPLANATION OF REFERENCE NUMERALS

(5) 101: light-emitting layer or light-emitting film 102a, 102b: barrier layer 201: light source 301: light guiding plate 302: reflective layer

MODES OF THE INVENTION

(6) Hereinafter, a light-emitting film of the present application will be described in detail with reference to an example and a comparative example, but the scope of the light-emitting film is not limited to the following examples.

Example 1

(7) Poly(ethyleneglycol) diacrylate (PEGDA; CAS No.: 26570-48-9, solubility parameter (HSP): about 18 (cal/cm.sup.3).sup.1/2), lauryl acrylate (LA; CAS No.: 2156-97-0, solubility parameter (HSP): about 8 (cal/cm.sup.3).sup.1/2), bisfluorene diacrylate (BD; CAS No.: 161182-73-6, solubility parameter (HSP): about 8 to 9 (cal/cm.sup.3).sup.1/2), green particles (quantum dot particles), a surfactant (polyvinylpyrrolidone) and SiO.sub.2 nanoparticles were mixed in a weight ratio of 9:1:1:0.1:0.05:0.05 (PEGDA:LA:BD:green particles:surfactant: SiO.sub.2 nanoparticles). Subsequently, as a radical initiator, about 1 wt % of Irgacure 2959 and Irgacure 907 each were added, mixed and stirred for about 6 hours, thereby preparing a mixture. The mixture was disposed between two barrier films (i-component) spaced apart from each other at regular intervals to have a thickness of about 100 m, UV rays were irradiated to induce radical polymerization, and the coating solution was cured, thereby forming a light-emitting layer. FIG. 4 is an image of the light-emitting layer formed by the above-described method. Referring to FIG. 4, it can be confirmed that emulsion regions in which the green particles are present are dispersed in a matrix.

Comparative Example 1

(8) A light-emitting layer was manufactured by the same method as described in the example, except that a mixture of lauryl acrylate (LA; CAS No.: 2156-97-0, solubility parameter (HSP): about 8 (cal/cm.sup.3).sup.1/2), bisfluorene diacrylate (BD; CAS No.: 161182-73-6, solubility parameter (HSP): about 8 to 9 (cal/cm.sup.3).sup.1/2), trimethylolpropane triacrylate (TMPTA; CAS No.: 15625-89-5), green particles (quantum dot particles) and SiO.sub.2 nanoparticles in a ratio of 10:1:0.1:0.05:0.05 (LA:BD:TMPTA:green particles:SiO.sub.2 nanoparticles) was used, and thus a light-emitting film was manufactured.

Experimental Example 1

(9) The light-emitting film manufactured in Example 1 or Comparative Example 1 was disposed on a surface of a light source emitting blue light, which emitted light, at room temperature, and the light emitted from the light source was incident for about 24 hours. Afterward, a region in which an intensity of the emitted light is reduced from an edge of the film (damaged region) was observed using a microscope. FIG. 5 is an observation result for Example 1, and a size of the damaged region (light intensity-decreased region) was about 200 m. FIG. 6 is an observation result for Comparative Example 1, and a size of the damaged region (light intensity-decreased region) was about 1000 m. FIG. 7 is a graph showing degrees of generation of the damaged regions (light intensity-decreased region) by time in Example 1 and Comparative Example 1.

(10) As described above, the exemplary embodiments of the present application have been described in detail. Therefore, it will be clearly understood by those of ordinary skill in the art that the detailed descriptions are merely exemplary embodiments, and the scope of the present application is not limited thereto. Accordingly, the actual range of the present application will be defined by the accompanying claims and equivalents thereof.