COMPOSITE LIGHT-EMITTING MATERIAL AND LIGHT-EMITTING DEVICE COMPRISING THE SAME

• US 20080121844A1
• Filed: 01/09/2007
• Published: 05/29/2008
• Est. Priority Date: 08/21/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Original Assignee: Samsung Electronics Co. Ltd. (Samsung Group)
• Inventors: LIM, Jung Eun, JANG, Eun Joo, JUN, Shin Ae
• Granted Patent: US 8,237,154 B2
• Time in Patent Office: Days
• US Class Current: 252/301.33
• CPC Class Codes: C09K 11/025 non-luminescent particle coatings or suspension media
• CPC Class Codes: C09K 11/565 with zinc cadmium
• CPC Class Codes: C09K 11/881 Chalcogenides
• CPC Class Codes: C09K 11/883 with zinc or cadmium
• CPC Class Codes: C09K 11/89 containing mercury
• CPC Class Codes: C09K 11/892 Chalcogenides
• CPC Class Codes: H01L 33/502 Wavelength conversion materials
• CPC Class Codes: Y10T 428/2949 Glass, ceramic or metal oxide in coating

Abstract

Disclosed herein are a composite light-emitting material, which includes two or more light-emitting materials selected from an inorganic phosphor, a semiconductor nanocrystal and an organic dye in which the surfaces of the two or more light-emitting materials are coated; and a light-emitting device comprising the same, so as to improve the luminous efficiency and lifetime.

Claims

1. A composite light-emitting material comprising two or more light-emitting materials selected from an inorganic phosphor, a semiconductor nanocrystal and an organic dye, in which surfaces of the two or more light-emitting materials are coated.

2. The composite light-emitting material according to claim 1, comprising the organic dye and the semiconductor nanocrystal disposed in a transparent metal oxide matrix.

3. The composite light-emitting material according to claim 1, comprising a core material and a transparent coating layer.

4. The composite light-emitting material according to claim 3, wherein the core material is an inorganic phosphor or a semiconductor nanocrystal.

5. The composite light-emitting material according to claim 3, wherein the transparent coating layer comprises one or both of a semiconductor nanocrystal and an organic dye in a matrix.

6. The composite light-emitting material according to claim 5, wherein the matrix comprises a metal oxide or a polymer.

7. The composite light-emitting material according to claim 3, wherein the transparent coating layer comprises a semiconductor nanocrystal in a transparent metal oxide matrix.

8. The composite light-emitting material according to claim 3, wherein the transparent coating layer comprises an organic dye in a transparent metal oxide matrix.

9. The composite light-emitting material according to claim 3, wherein the transparent coating layer comprises an organic dye and a semiconductor nanocrystal in a transparent metal oxide matrix.

10. The composite light-emitting material according to claim 1, wherein the semiconductor nanocrystal is coated with a transparent metal oxide.

11. The composite light-emitting material according to claim 10, wherein the transparent coating layer comprises a semiconductor nanocrystal coated with the transparent metal oxide in a transparent metal oxide matrix.

12. The composite light-emitting material according to claim 1, wherein the semiconductor nanocrystal is coated with a transparent metal oxide containing an organic dye.

13. The composite light-emitting material according to claim 12, wherein the transparent coating layer comprises a semiconductor nanocrystal coated with the transparent metal oxide containing an organic dye in a transparent metal oxide matrix.

14. The composite light-emitting material according to claim 12, wherein the transparent coating layer comprises a semiconductor nanocrystal and an organic dye coated with the transparent metal oxide containing an organic dye in a transparent metal oxide matrix.

15. The composite light-emitting material according to claim 10, wherein the transparent coating layer comprises a semiconductor nanocrystal coated with the transparent metal oxide in a transparent metal oxide matrix containing an organic dye.

16. The composite light-emitting material according to claim 2, wherein the transparent metal oxide is selected from the group consisting of titanium oxide, niobium oxide, hafnium oxide, indium oxide, tungsten oxide, tin oxide and zinc oxide.

17. The composite light-emitting material according to claim 6, wherein the polymer is one or more selected from the group consisting of polycarbonate, polyvinyl carbazole, polymethyl methacrylate, polystyrene, and polyethylene terephthalate.

18. The composite light-emitting material according to claim 1, wherein the semiconductor nanocrystal is selected from the group consisting of a II-VI family compound, a III-V family compound, a IV-VI family compound, a IV family compound, and a mixture thereof.

19. The composite light-emitting material according to claim 18, wherein the II-VI family compound is selected from the group consisting of CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTe, HgSeS, HgSeTe, HgSTe, CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, HgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe, CdHgSTe, HgZnSeS, HgZnSeTe, and HgZnSTe.

20. The composite light-emitting material according to claim 18, wherein the III-V family compound is selected from the group consisting of GaN, GaP, GaAs, GaSb, AlN, AlP, AlAs, AlSb, InN, InP, InAs, InSb, GaNP, GaNAs, GaNSb, GaPAs, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, GaInNSb, GaInPAs, GaInPSb, InAlNP, InAlNAs, InAlNSb, InAlPAs, and InAlPSb.

21. The composite light-emitting material according to claim 18, wherein the IV-VI family compound is selected from the group consisting of SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, SnPbSSe, SnPbSeTe, and SnPbSTe.

22. The composite light-emitting material according to claim 18, wherein the IV family compound is selected from the group consisting of Si, Ge, SiC, and SiGe.

23. The composite light-emitting material according to claim 1, wherein the organic dye is an organic metal complex or an organic substance dye.

24. The composite light-emitting material according to claim 23, wherein the organic substance dye is selected from the group consisting of coumarin, Rhodamine, phenoxazone, stilbene, terphenyl and quarterphenyl.

25. A light-emitting device comprising the composite light-emitting material according to claim 1.

26. The light-emitting device according to claim 25, wherein the light-emitting device is a light-emitting diode.