Electronic appliance and light-emitting device

• US 9,257,489 B2
• Filed: 04/07/2014
• Issued: 02/09/2016
• Est. Priority Date: 12/06/2004
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Sakata, Junichiro, Ikeda, Hisao, Kawakami, Takahiro
• Primary Examiner(s): Patel, Ashok
• Application Number:
  US14/246,456
• Publication Number:
  US 20140217387A1
• Time in Patent Office: 673 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 2211/1011 Condensed systems
• CPC Class Codes: C09K 2211/1029 containing one nitrogen atom as the heteroatom
• CPC Class Codes: C09K 2211/1033 with oxygen
• CPC Class Codes: C09K 2211/1044 containing two nitrogen atoms as heteroatoms
• CPC Class Codes: C09K 2211/185 of the platinum group, i.e. Os, Ir, Pt, Ru, Rh or Pd
• CPC Class Codes: C09K 2211/188 of other metals not provided for in one of the previous groups
• CPC Class Codes: H10K 2102/3031 Two-side emission, e.g. transparent OLEDs [TOLED]
• CPC Class Codes: H10K 2102/331 Nanoparticles used in non-emissive layers, e.g. in packaging layer
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/171 Electron injection layers
• CPC Class Codes: H10K 59/10 OLED displays
• CPC Class Codes: H10K 59/173 comprising banks or shadow masks
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/353 characterised by the geometrical arrangement of the RGB subpixels
• CPC Class Codes: H10K 71/841 Applying alternating current [AC] during manufacturing or treatment
• CPC Class Codes: Y10S 428/917 : Electroluminescent

Abstract

An EL element having a novel structure is provided, which is suitable for AC drive. A light-emitting element of the invention is provided with material layers (material layers each having approximately symmetric I-V characteristics with respect to the zero point in a graph having the abscissa axis showing current values and the ordinate axis showing voltage values) between a first electrode and a layer including an organic compound and between the layer including the organic compound and a second electrode respectively. Specifically, each of the material layers is a composite layer including a metal oxide and an organic compound.

Claims

1. A light-emitting device comprising:

a first substrate;

a first partition wall over the first substrate;

a second partition wall over the first partition wall;

a plurality of light-emitting elements over the first substrate, the plurality of light-emitting elements being partitioned by the first partition wall; and

a second substrate over the first substrate,

wherein a width of a top surface of the first partition wall is larger than a width of a bottom surface of the second partition wall,

wherein a width of a bottom surface of the first partition wall is larger than a width of a top surface of the second partition wall, and

wherein the plurality of light-emitting elements comprises;

a first element emitting red light;

a second element emitting green light;

a third element emitting blue light; and

a fourth element emitting white light.

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

wherein the first partition wall is a tapered partition wall, and

wherein the second partition wall is an inversely tapered partition wall.

3. The light-emitting device according to claim 1, wherein at least one of the first substrate and the second substrate comprises a material selected from the group of consisting of polyimide, polyamide, polyether sulfone, polycarbonate, polyethylene terephthalate, and polyethylene naphtalate.

4. The light-emitting device according to claim 1, wherein the second partition wall is formed using a positive photosensitive resin.

5. The light-emitting device according to claim 1, wherein each of the plurality of light-emitting elements comprises a composite layer comprising a metal oxide and an organic compound.

6. The light-emitting device according to claim 5, wherein the metal oxide is one or more of molybdenum oxide, tungsten oxide, and rhenium oxide.

7. The light-emitting device according to claim 1, wherein the light-emitting device is a lighting device.

8. A light-emitting device comprising:

a first substrate;

a first partition wall over the first substrate;

a second partition wall over the first partition wall;

a plurality of light-emitting elements over the first substrate, the plurality of light-emitting elements being partitioned by the first partition wall; and

a second substrate over the first substrate,

wherein a width of a top surface of the first partition wall is larger than a width of a bottom surface of the second partition wall,

wherein a width of a bottom surface of the first partition wall is larger than a width of a top surface of the second partition wall,

wherein each of the plurality of light-emitting elements emits white light,

wherein red light, green light, and blue light are obtained through color filters, and

wherein red light, green light, blue light, and white light are extracted to an outside.

9. The light-emitting device according to claim 8,

wherein the first partition wall is a tapered partition wall, and

wherein the second partition wall is an inversely tapered partition wall.

10. The light-emitting device according to claim 8, wherein at least one of the first substrate and the second substrate comprises a material selected from the group of consisting of polyimide, polyamide, polyether sulfone, polycarbonate, polyethylene terephthalate, and polyethylene naphtalate.

11. The light-emitting device according to claim 8, wherein the second partition wall is formed using a positive photosensitive resin.

12. The light-emitting device according to claim 8, wherein each of the plurality of light-emitting elements comprises a composite layer comprising a metal oxide and an organic compound.

13. The light-emitting device according to claim 12, wherein the metal oxide is one or more of molybdenum oxide, tungsten oxide, and rhenium oxide.

14. The light-emitting device according to claim 8, wherein the light-emitting device is a lighting device.

15. A light-emitting device comprising:

a first substrate;

a first partition wall over the first substrate, the first partition wall being a tapered partition wall;

a second partition wall over the first partition wall, the second partition wall being an inversely tapered partition wall;

a plurality of light-emitting elements over the first substrate, the plurality of light-emitting elements being partitioned by the first partition wall; and

a second substrate over the first substrate,

wherein a width of a top surface of the first partition wall is larger than a width of a bottom surface of the second partition wall,

wherein a width of a bottom surface of the first partition wall is larger than a width of a top surface of the second partition wall, and

wherein the plurality of light-emitting elements comprises;

a first element emitting red light;

a second element emitting green light;

a third element emitting blue light; and

a fourth element emitting white light.

16. The light-emitting device according to claim 15, wherein at least one of the first substrate and the second substrate comprises a material selected from the group of consisting of polyimide, polyamide, polyether sulfone, polycarbonate, polyethylene terephthalate, and polyethylene naphtalate.

17. The light-emitting device according to claim 15, wherein the second partition wall is formed using a positive photosensitive resin.

18. The light-emitting device according to claim 15, wherein each of the plurality of light-emitting elements comprises a composite layer comprising a metal oxide and an organic compound.

19. The light-emitting device according to claim 18, wherein the metal oxide is one or more of molybdenum oxide, tungsten oxide, and rhenium oxide.

20. The light-emitting device according to claim 15, wherein the light-emitting device is a lighting device.