Light-emitting element, display and display device

• US 8,796,719 B2
• Filed: 10/28/2010
• Issued: 08/05/2014
• Est. Priority Date: 02/25/2010
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Ohe, Masahito, Fujita, Yoshimasa, Kobayashi, Yuhki, Okamoto, Ken, Ogata, Hidenori, Yamada, Makoto
• Primary Examiner(s): Lee, Calvin
• Application Number:
  US13/579,874
• Publication Number:
  US 20120326180A1
• Time in Patent Office: 1,377 Days
• Field of Search: 257/13, 257/79, 257/98, 313498-506, 438 29- 32
• US Class Current: 257/98
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 11/77342 Silicates
• CPC Class Codes: C09K 11/7736 Vanadates; Chromates; Molybdates; Tungstates
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133617 Illumination with ultraviolet light; Luminescent elements or materials associated to the cell
• CPC Class Codes: H10K 2102/331 Nanoparticles used in non-emissive layers, e.g. in packaging layer
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair

Abstract

A light-emitting element of the present invention includes (i) a light-emitting layer (109), (ii) an electrode layer (110) being transparent to part of light emitted from the light-emitting layer (109), (iii) color converting layers (113, 114), and (iv) a transparent layer (115). The color converting layers (113, 114) and the transparent layer (115) sandwich the transparent electrode layer (110) with the light-emitting layer (109). The color converting layers (113, 114) and the transparent electrode layer (115) contain particles (116, 117, 118) expressing a surface plasmon phenomenon, respectively.

Claims

1. A light-emitting element, comprising:

a light-emitting layer;

a transparent electrode layer being transparent to at least part of light emitted from the light-emitting layer; and

a converting layer for converting color of the light, the converting layer and the light-emitting layer sandwiching the transparent electrode layer therebetween,

the converting layer containing particles that contains metal expressing a surface plasmon phenomenon.

2. The light-emitting element as set forth in claim 1, comprising:

a pair of electrode layers sandwiching the light-emitting layer,

one of the pair of electrode layers being a semi-transparent electrode layer provided as the transparent electrode layer,

the other one of the pair of electrode layers being a reflective electrode layer, and

the light-emitting layer having a thickness that matches a wavelength of the light emitted from the light-emitting layer.

3. The light-emitting element as set forth in claim 1, wherein the particles are made from the metal.

4. The light-emitting element as set forth in claim 1, wherein the particles are spherical.

5. The light-emitting element as set forth in claim 1, wherein the particles have two different-shaped cross sections being orthogonal with each other.

6. The light-emitting element as set forth in claim 1, wherein the particles are agglomerations of a plurality of particles.

7. The light-emitting element as set forth in claim 1, wherein the particles are made from the metal and a dielectric material.

8. The light-emitting element as set forth in claim 1, wherein the light-emitting layer is an organic electroluminescence light-emitting layer.

9. A display comprising a light-emitting element as set forth in claim 1.

10. A display device comprising a display as set forth in claim 9.

11. The light-emitting element as set forth in claim 1, wherein the light-emitting layer emits blue light, and the converting layer is a fluorescent layer for performing fluorescent conversion of the blue light.

12. The light-emitting element as set forth in claim 11, wherein the particles contained in the fluorescent layer are mixed with fluorescent particles in the fluorescent layer.

13. The light-emitting element as set forth in claim 11, wherein the particles contained in the fluorescent layer are located on a surface of the fluorescent layer, which surface faces the light emitting layer.

14. The light-emitting element as set forth in claim 11, wherein the fluorescent layer includes a film of the particles contained in the fluorescent layer on the surface of the fluorescent layer, which surface faces the light emitting layer.

15. The light-emitting element as set forth in claim 11, wherein the fluorescent layer includes a red fluorescent layer and a green fluorescent layer,

the red fluorescent layer being configured to convert, into red, the blue light emitted from the light-emitting layer, and

the green fluorescent layer being configured to convert, into green, the blue light emitted from the light-emitting layer.

16. The light-emitting element as set forth in claim 15, wherein the particles contained in the red fluorescent layer and the particles contained in the green fluorescent layer are different in size from each other.

17. The light-emitting element as set forth in claim 11, further comprising a transparent layer being transparent to the blue light without converting the blue light, the transparent layer containing the particles.

18. The light-emitting element as set forth in claim 17, wherein

the fluorescent layer includes a red fluorescent layer and a green fluorescent layer,

the red fluorescent layer is configured to convert, into red, the blue light emitted from the light-emitting layer,

the green fluorescent layer is configured to convert, into green, the blue light emitted from the light-emitting layer, and

the particles contained in the red fluorescent layer, the particles contained in the green fluorescent layer, and the particles contained in the transparent layer are different in size from each other.

19. The light-emitting element as set forth in claim 17, wherein the particles contained in the transparent layer are located on a surface of the transparent layer, which surface faces the light emitting layer.

20. The light-emitting element as set forth in claim 17, the transparent layer includes a film of the particles contained in the transparent layer on the surface of the transparent layer, which surface faces the light emitting layer.