IP Library › Granted Patent US 9,472,601

Granted Patent B2

US 9,472,601 · App. 14/683,695 · Granted Oct 18, 2016

Light-emitting device and display device

Inventors: Satoshi Seo (Kanagawa, JP); Toshiki Sasaki (Kanagawa, JP); Nobuharu Ohsawa (Kanagawa, JP); Takahiro Ushikubo (Kanagawa, JP); Shunpei Yamazaki (Tokyo, JP)

Assignee: Semiconductor Energy Laboratory Co., Ltd.

H01L27/322 H01L51/504 H01L51/5215 H01L51/5218 H01L51/5234 H01L51/5265 H01L51/5278 H01L2251/558

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Quick Facts

Patent No.: US 9,472,601
App. No.: 14/683,695
Granted: Oct 18, 2016
Kind: B2

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USPTO Patent Center↗ Full Patent PDF↗

Abstract

A technique of manufacturing a display device with high productivity is provided. In addition, a high-definition display device with high color purity is provided. By adjusting the optical path length between an electrode having a reflective property and a light-emitting layer by the central wavelength of a wavelength range of light passing through a color filter layer, the high-definition display device with high color purity is provided without performing selective deposition of light-emitting layers. In a light-emitting element, a plurality of light-emitting layers emitting light of different colors are stacked. The closer the light-emitting layer is to the electrode having a reflective property, the longer the wavelength of light emitted from the light-emitting layer is.

Claims (201)

1. A light-emitting device comprising:

a first element comprising:

a first color filter layer; and

a first light-emitting element,

wherein the first light-emitting element comprises:

a first electrode having a reflective property;

a first light-emitting layer over the first electrode; and

a second light-emitting layer over the first light-emitting layer; and

a second element comprising:

a second color filter layer; and

a second light-emitting element,

wherein the second light-emitting element comprises:

a second electrode having a reflective property;

the first light-emitting layer over the second electrode; and

the second light-emitting layer over the first light-emitting layer,

wherein a first optical path length is an optical path length between the first electrode and the first light-emitting layer, and the first optical path length is one-quarter of a first central wavelength of a first wavelength range in which the first color filter layer has a transmittance of 50% or higher in the visible light range,

wherein a second optical path length is an optical path length between the second electrode and the second light-emitting layer, and the second optical path length is m-quarters of a second central wavelength of a second wavelength range in which the second color filter layer has a transmittance of 50% or higher in the visible light range,

wherein m is an odd number of three or more, and

wherein a wavelength of a color of light emitted from the first light-emitting layer is longer than a wavelength of a color of light emitted from the second light-emitting layer.

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

wherein the first central wavelength is a median of the first wavelength range, and

wherein the second central wavelength is a median of the second wavelength range.

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

wherein the first central wavelength is longer than the second central wavelength.

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

wherein the second light-emitting element further comprises a first conductive layer having a light-transmitting property between the second electrode and the first light-emitting layer.

5. The light-emitting device according to claim 4 ,

wherein the first conductive layer comprises a material selected from a group consisting of indium oxide, indium tin oxide, an indium oxide-zinc oxide alloy, zinc oxide, zinc oxide to which gallium is added, graphene, polyaniline or a derivative thereof, polypyrrole or a derivative thereof, polythiophene or a derivative thereof, and a copolymer of two or more of aniline, pyrrole, and thiophene or a derivative thereof.

6. The light-emitting device according to claim 4 ,

wherein the first light-emitting element further comprises a second conductive layer having a light-transmitting property between the first electrode and the first light-emitting layer, and

wherein the second conductive layer has a different thickness from the first conductive layer.

7. The light-emitting device according to claim 6 ,

wherein the second conductive layer comprises a material selected from a group consisting of indium oxide, indium tin oxide, an indium oxide-zinc oxide alloy, zinc oxide, zinc oxide to which gallium is added, graphene, polyaniline or a derivative thereof, polypyrrole or a derivative thereof, polythiophene or a derivative thereof, and a copolymer of two or more of aniline, pyrrole, and thiophene or a derivative thereof.

8. The light-emitting device according to claim 1 , further comprising a charge generation layer between the first light-emitting layer and the second light-emitting layer.

9. The light-emitting device according to claim 1 , further comprising an electrode having a light-transmitting property over the second light-emitting layer.

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

wherein the light-emitting device is a display device.

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

wherein the visible light range is 380 nm to 680 nm.

12. A light-emitting device comprising:

a first element comprising:

a first color filter layer; and

a first light-emitting element,

wherein the first light-emitting element comprises:

a first electrode having a reflective property;

a first light-emitting layer over the first electrode; and

a second light-emitting layer over the first light-emitting layer; and

a second element comprising:

a second color filter layer; and

a second light-emitting element,

wherein the second light-emitting element comprises:

a second electrode having a reflective property;

the first light-emitting layer over the second electrode; and

the second light-emitting layer over the first light-emitting layer,

wherein a first optical path length is an optical path length between a surface of the first electrode and a lower surface of the first light-emitting layer or more and an optical path length between the surface of the first electrode and an upper surface of the first light-emitting layer or less,

wherein the first optical path length is one-quarter of a first central wavelength of a first wavelength range in which the first color filter layer has a transmittance of 50% or higher in the visible light range,

wherein a second optical path length is an optical path length between a surface of the second electrode and a lower surface of the second light-emitting layer or more and an optical path length between the surface of the second electrode and an upper surface of the second light-emitting layer or less,

wherein the second optical path length is m-quarters of a second central wavelength of a second wavelength range in which the second color filter layer has a transmittance of 50% or higher in the visible light range,

wherein m is an odd number of three or more, and

wherein a wavelength of a color of light emitted from the first light-emitting layer is longer than a wavelength of a color of light emitted from the second light-emitting layer.

13. The light-emitting device according to claim 12 ,

wherein the first central wavelength is a median of the first wavelength range, and

wherein the second central wavelength is a median of the second wavelength range.

14. The light-emitting device according to claim 12 ,

wherein the first central wavelength is longer than the second central wavelength.

15. The light-emitting device according to claim 12 ,

wherein the second light-emitting element further comprises a first conductive layer having a light-transmitting property between the second electrode and the first light-emitting layer.

16. The light-emitting device according to claim 15 ,

17. The light-emitting device according to claim 15 ,

wherein the first light-emitting element further comprises a second conductive layer having a light-transmitting property between the first electrode and the first light-emitting layer, and

wherein the second conductive layer has a different thickness from the first conductive layer.

18. The light-emitting device according to claim 17 ,

19. The light-emitting device according to claim 12 , further comprising a charge generation layer between the first light-emitting layer and the second light-emitting layer.

20. The light-emitting device according to claim 12 , further comprising an electrode having a light-transmitting property over the second light-emitting layer.

21. The light-emitting device according to claim 12 ,

wherein the light-emitting device is a display device.

22. The light-emitting device according to claim 12 ,

wherein the visible light range is 380 nm to 680 nm.

23. A light-emitting device comprising:

a first element comprising:

a first color filter layer; and

a first light-emitting element,

wherein the first light-emitting element comprises:

a first electrode having a reflective property;

a first light-emitting layer over the first electrode;

a second light-emitting layer over the first light-emitting layer; and

a third light-emitting layer over the second light-emitting layer;

a second element comprising:

a second color filter layer; and

a second light-emitting element,

wherein the second light-emitting element comprises:

a second electrode having a reflective property;

the first light-emitting layer over the second electrode;

the second light-emitting layer over the first light-emitting layer; and

the third light-emitting layer over the second light-emitting layer; and

a third element comprising:

a third color filter layer; and

a third light-emitting element,

wherein the third light-emitting element comprises:

a third electrode having a reflective property;

the first light-emitting layer over the third electrode;

the second light-emitting layer over the first light-emitting layer; and

the third light-emitting layer over the second light-emitting layer,

wherein a second optical path length is an optical path length between the second electrode having a reflective property and the second light-emitting layer in the second element, and the second optical path length is m-quarters of a second central wavelength of a second wavelength range in which the second color filter layer has a transmittance of 50% or higher in the visible light range,

wherein a third optical path length is an optical path length between the third electrode having a reflective property and the third light-emitting layer in the third element, and the third optical path length is n-quarters of a third central wavelength of a third wavelength range in which the third color filter layer has a transmittance of 50% or higher in the visible light range,

wherein m is an odd number of three or more, and n is an odd number of three or more,

wherein a wavelength of a color of light emitted from the first light-emitting layer is longer than a wavelength of a color of light emitted from the second light-emitting layer, and

wherein the wavelength of the color of light emitted from the second light-emitting layer is longer than a wavelength of a color of light emitted from the third light-emitting layer.

24. The light-emitting device according to claim 23 ,

wherein the first central wavelength is a median of the first wavelength range, and

wherein the second central wavelength is a median of the second wavelength range.

25. The light-emitting device according to claim 23 ,

wherein the first central wavelength is longer than the second central wavelength, and

wherein the second central wavelength is longer than the third central wavelength.

26. The light-emitting device according to claim 23 ,

wherein the second light-emitting element further comprises a first conductive layer having a light-transmitting property between the second electrode and the first light-emitting layer,

wherein the third light-emitting element further comprises a second conductive layer having a light-transmitting property between the third electrode and the first light-emitting layer, and

wherein the first conductive layer has a different thickness from the second conductive layer.

27. The light-emitting device according to claim 26 ,

28. The light-emitting device according to claim 26 ,

wherein the first light-emitting element further comprises a third conductive layer having a light-transmitting property between the first electrode and the first light-emitting layer, and

wherein the third conductive layer has a different thickness from the first conductive layer and the second conductive layer.

29. The light-emitting device according to claim 28 ,

wherein the third conductive layer comprises a material selected from a group consisting of indium oxide, indium tin oxide, an indium oxide-zinc oxide alloy, zinc oxide, zinc oxide to which gallium is added, graphene, polyaniline or a derivative thereof, polypyrrole or a derivative thereof, polythiophene or a derivative thereof, and a copolymer of two or more of aniline, pyrrole, and thiophene or a derivative thereof.

30. The light-emitting device according to claim 26 , further comprising a charge generation layer between the first light-emitting layer and the second light-emitting layer,

wherein the second light-emitting layer is in contact with the third light-emitting layer,

wherein a spectrum of light emitted from the first light-emitting layer has a peak in a range of 600 nm to 700 nm,

wherein a spectrum of light emitted from the second light-emitting layer has a peak in a range of 520 nm to 550 nm, and

wherein a spectrum of light emitted from the third light-emitting layer has a peak in a range of 430 nm to 470 nm.

31. The light-emitting device according to claim 26 , further comprising an electrode having a light-transmitting property over the third light-emitting layer.

32. The light-emitting device according to claim 23 ,

wherein the light-emitting device is a display device.

33. The light-emitting device according to claim 23 ,

wherein the visible light range is 380 nm to 680 nm.

34. A light-emitting device comprising:

a first element comprising:

a first color filter layer; and

a first light-emitting element,

wherein the first light-emitting element comprises:

a first electrode having a reflective property;

a first light-emitting layer over the first electrode;

a second light-emitting layer over the first light-emitting layer; and

a third light-emitting layer over the second light-emitting layer;

a second element comprising:

a second color filter layer; and

a second light-emitting element,

wherein the second light-emitting element comprises:

a second electrode having a reflective property;

the first light-emitting layer over the second electrode;

the second light-emitting layer over the first light-emitting layer; and

the third light-emitting layer over the second light-emitting layer; and

a third element comprising:

a third color filter layer; and

a third light-emitting element,

wherein the third light-emitting element comprises:

a third electrode having a reflective property;

the first light-emitting layer over the third electrode;

the second light-emitting layer over the first light-emitting layer; and

the third light-emitting layer over the second light-emitting layer,

wherein a third optical path length is an optical path length between a surface of the third electrode and a lower surface of the third light-emitting layer or more and an optical path length between the surface of the third electrode and an upper surface of the third light-emitting layer or less,

wherein the third optical path length is n-quarters of a third central wavelength of a third wavelength range in which the third color filter layer has a transmittance of 50% or higher in the visible light range,

wherein m is an odd number of three or more, and n is an odd number of three or more,

wherein a wavelength of a color of light emitted from the first light-emitting layer is longer than a wavelength of a color of light emitted from the second light-emitting layer, and

wherein the wavelength of the color of light emitted from the second light-emitting layer is longer than a wavelength of a color of light emitted from the third light-emitting layer.

35. The light-emitting device according to claim 34 ,

wherein the first central wavelength is a median of the first wavelength range, and

wherein the second central wavelength is a median of the second wavelength range.

36. The light-emitting device according to claim 34 ,

wherein the first central wavelength is longer than the second central wavelength, and

wherein the second central wavelength is longer than the third central wavelength.

37. The light-emitting device according to claim 34 ,

wherein the second light-emitting element further comprises a first conductive layer having a light-transmitting property between the second electrode and the first light-emitting layer,

wherein the third light-emitting element further comprises a second conductive layer having a light-transmitting property between the third electrode and the first light-emitting layer, and

wherein the first conductive layer has a different thickness from the second conductive layer.

38. The light-emitting device according to claim 37 ,

39. The light-emitting device according to claim 37 ,

wherein the first light-emitting element further comprises a third conductive layer having a light-transmitting property between the first electrode and the first light-emitting layer, and

wherein the third conductive layer has a different thickness from the first conductive layer and the second conductive layer.

40. The light-emitting device according to claim 39 ,

41. The light-emitting device according to claim 37 , further comprising a charge generation layer between the first light-emitting layer and the second light-emitting layer,

wherein the second light-emitting layer is in contact with the third light-emitting layer,

wherein a spectrum of light emitted from the first light-emitting layer has a peak in a range of 600 nm to 700 nm,

wherein a spectrum of light emitted from the second light-emitting layer has a peak in a range of 520 nm to 550 nm, and

wherein a spectrum of light emitted from the third light-emitting layer has a peak in a range of 430 nm to 470 nm.

42. The light-emitting device according to claim 37 , further comprising an electrode having a light-transmitting property over the third light-emitting layer.

43. The light-emitting device according to claim 34 ,

wherein the light-emitting device is a display device.

44. The light-emitting device according to claim 34 ,

wherein the visible light range is 380 nm to 680 nm.

Priority Claims (1)

JP 2011-027961 · Feb 11, 2011 · national

Continuity (2)

Continuation 13368834 · Feb 8, 2012

Related Publication 20150221703A1 · Aug 6, 2015