Light-emitting device, production method therefor, and display containing the same

• US 8,492,783 B2
• Filed: 09/02/2009
• Issued: 07/23/2013
• Est. Priority Date: 09/22/2008
• Status: Active Grant

• Current Assignee: UDC Ireland Limited
• Original Assignee: UDC Ireland Limited
• Inventors: Usami, Yoshihisa
• Primary Examiner(s): Lee, Hsien Ming
• Assistant Examiner(s): Fan, Michele
• Application Number:
  US13/120,139
• Publication Number:
  US 20110175116A1
• Time in Patent Office: 1,420 Days
• Field of Search: 257/79, 257/98, 257/E33.005, 257/E33.067, 257/E33.074, 438/22, 438/29, 438/39, 438/42
• US Class Current: 257/98
• 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. A light-emitting device comprising, in the order mentioned:

a light-emitting layer containing a plurality of light-emitting portions,

an intermediate layer,

a reflective layer, and

a fine concavo-convex pattern, the fine concavo-convex pattern comprises a reflective material,

wherein the intermediate layer is disposed over a planar 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 planar second surface of the light-emitting layer and the reflective layer is disposed between the intermediate layer and fine concavo-convex pattern 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.

2. The light-emitting device according to claim 1, 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.

3. The light-emitting device according to claim 1, wherein the light-emitting layer contains two or more light-emitting portions.

4. The light-emitting device according to claim 1, wherein the fine concavo-convex pattern is made of heat-mode resist.

5. The light-emitting device according to claim 1, wherein the reflective layer has a thickness of 10 nm to 10,000 nm.

6. The light-emitting device according to claim 1, wherein the intermediate layer has a refractive index of 1.55 to 3.0.

7. The light-emitting device according to claim 1, wherein the fine concavo-convex pattern has a pitch interval of 50 nm to 10 μ

m.

8. The light-emitting device according to claim 1, wherein the light-emitting layer further comprises a seal layer for sealing the light-emitting portions, 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.

9. 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 planar 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 comprising a reflective material and having a cross-sectional shape which has portions projected and recessed with respect to the planar second surface of the light-emitting layer, and a reflective layer is disposed between the fine concavo-convex pattern and intermediate layer for 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.

10. The production method according to claim 9, 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.

11. The production method according to claim 9, wherein the intermediate layer has a refractive index of 1.55 to 3.0.

12. The production method according to claim 9, wherein the fine concavo-convex pattern has a pitch interval of 50 nm to 10 μ

m.

13. 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,

a reflective layer,

a fine concavo-convex pattern comprising a reflective material, and

wherein the intermediate layer is disposed over a planar 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 planar second surface of the light-emitting layer and the reflective layer is disposed between the intermediate layer and fine concavo-convex pattern 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.

14. The display according to claim 13, 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.

15. The display according to claim 13, wherein the intermediate layer has a refractive index of 1.55 to 3.0.

16. The display according to claim 13, wherein the fine concavo-convex pattern has a pitch interval of 50 nm to 10 μ

m.