LIGHT-EMITTING DEVICE, PRODUCTION METHOD THEREFOR, AND DISPLAY CONTAINING THE SAME

• US 20110175116A1
• Filed: 09/02/2009
• Published: 07/21/2011
• Est. Priority Date: 09/22/2008
• Status: Active Grant

• Current Assignee: UDC Ireland Limited
• Original Assignee: UDC Ireland Limited
• Inventors: Usami, Yoshihisa
• Granted Patent: US 8,492,783 B2
• Time in Patent Office: Days
• US Class Current: 257/88
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H05B 33/14 characterised by the chemical or physical composition or the arrangement of the electroluminescent material , or by the simultaneous addition of the electroluminescent material in or onto the light source
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/854 comprising scattering means
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 59/878 comprising reflective means

Abstract

The present invention provides a light-emitting device which includes, in the order mentioned, a light-emitting layer containing a light-emitting portion, an intermediate layer, and a fine concavo-convex pattern, wherein the intermediate layer is disposed over a second surface of the light-emitting layer which surface is opposite to a first surface of the light-emitting layer, wherein the fine concavo-convex pattern has a cross-sectional shape which has portions projected and recessed with respect to the light-emitting layer, and reflects light emitted from the light-emitting layer, and wherein at least part of the intermediate layer has a refractive index of 0.9n to 1.1n, where n denotes a refractive index of the light-emitting portion with respect to light which has a main light-emitting wavelength.

Claims

1-11. -11. (canceled)

12. A light-emitting device comprising, in the order mentioned:

a light-emitting layer containing a light-emitting portion,

an intermediate layer, and

a fine concavo-convex pattern,

wherein the intermediate layer is disposed over a second surface of the light-emitting layer which surface is opposite to a first surface of the light-emitting layer,

wherein the fine concavo-convex pattern has a cross-sectional shape which has portions projected and recessed with respect to the light-emitting layer and reflects light emitted from the light-emitting layer, and

wherein at least part of the intermediate layer has a refractive index of 0.9n to 1.1n, where n denotes a refractive index of the light-emitting portion with respect to light which has a main light-emitting wavelength.

13. The light-emitting device according to claim 12, wherein the fine concavo-convex pattern has a pitch interval of 0.01λ

to 100λ

, where λ

denotes a main light-emitting wavelength of light emitted from the light-emitting layer.

14. The light-emitting device according to claim 12, wherein the light-emitting layer contains two or more of the light-emitting portion.

15. The light-emitting device according to claim 12, wherein the fine concavo-convex pattern is made of heat-mode resist.

16. The light-emitting device according to claim 12, wherein the fine concavo-convex pattern comprises a reflective layer.

17. The light-emitting device according to claim 16, wherein the reflective layer has a thickness of 10 nm to 10,000 nm.

18. The light-emitting device according to claim 12, wherein the intermediate layer has a refractive index of 1.55 to 3.0.

19. The light-emitting device according to claim 12, wherein the fine concavo-convex pattern has a pitch interval of 50 nm to 10 μ

m.

20. The light-emitting device according to claim 12, wherein the light-emitting layer further comprises a seal layer for sealing the light-emitting portion, and wherein a material of the seal layer is any of an acrylic resin, an epoxy resin, a fluorine-containing resin, a silicone resin, a rubber resin and an ester resin.

21. A production method for a light-emitting device, comprising:

forming a light-emitting layer containing a light-emitting portion,

forming an intermediate layer over a second surface of the light-emitting layer which surface is opposite to a first surface of the light-emitting layer, and

forming, over the intermediate layer, a fine concavo-convex pattern having a cross-sectional shape which has portions projected and recessed with respect to the light-emitting layer, the fine concavo-convex pattern reflecting light emitted from the light-emitting layer,

wherein the fine concavo-convex pattern is formed through heat-mode lithography,

wherein the light-emitting device comprises, in the order mentioned;

the light-emitting layer containing the light-emitting portion,

the intermediate layer, and

the fine concavo-convex pattern,

wherein the intermediate layer is disposed over the second surface of the light-emitting layer which surface is opposite to the first surface of the light-emitting layer,

wherein the fine concavo-convex pattern has the cross-sectional shape which has the portions projected and recessed with respect to the light-emitting layer and reflects the light emitted from the light-emitting layer, and

wherein at least part of the intermediate layer has a refractive index of 0.9n to 1.1n, where n denotes a refractive index of the light-emitting portion with respect to light which has a main light-emitting wavelength.

22. The production method according to claim 21, wherein the fine concavo-convex pattern has a pitch interval of 0.01λ

to 100λ

, where λ

denotes a main light-emitting wavelength of light emitted from the light-emitting layer.

23. The production method according to claim 21, wherein the fine concavo-convex pattern comprises a reflective layer.

24. The production method according to claim 21, wherein the intermediate layer has a refractive index of 1.55 to 3.0.

25. The production method according to claim 21, wherein the fine concavo-convex pattern has a pitch interval of 50 nm to 10 μ

m.

26. A display comprising:

a light-emitting device which comprises, in the order mentioned;

a light-emitting layer containing a light-emitting portion,

an intermediate layer, and

a fine concavo-convex pattern,

wherein the intermediate layer is disposed over a second surface of the light-emitting layer which surface is opposite to a first surface of the light-emitting layer,

wherein the fine concavo-convex pattern has a cross-sectional shape which has portions projected and recessed with respect to the light-emitting layer and reflects light emitted from the light-emitting layer, and

wherein at least part of the intermediate layer has a refractive index of 0.9n to 1.1n, where n denotes a refractive index of the light-emitting portion with respect to light which has a main light-emitting wavelength.

27. The display according to claim 26, wherein the fine concavo-convex pattern has a pitch interval of 0.01λ

to 100λ

, where λ

denotes a main light-emitting wavelength of light emitted from the light-emitting layer.

28. The display according to claim 26, wherein the fine concavo-convex pattern comprises a reflective layer.

29. The display according to claim 26, wherein the intermediate layer has a refractive index of 1.55 to 3.0.

30. The display according to claim 26, wherein the fine concavo-convex pattern has a pitch interval of 50 nm to 10 μ

m