IP Library › Granted Patent US 9,755,001
Granted Patent B2
US 9,755,001 · App. 14/710,115 · Granted Sep 5, 2017

Light-emitting device comprising films having different optical path lengths

Inventors: Satoshi Seo (Kanagawa, JP); Nobuharu Ohsawa (Kanagawa, JP); Toshiki Sasaki (Kanagawa, JP)
Assignee: Semiconductor Energy Laboratory Co., Ltd.
H01L27/3211H01L27/156H01L27/3213H01L33/405H01L33/42H01L33/44H01L51/504H01L51/5265H01L51/5278H01L27/322H01L2251/558
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Quick Facts
Patent No.
US 9,755,001
App. No.
14/710,115
Granted
Sep 5, 2017
Kind
B2
Abstract

A light-emitting device includes a first light-emitting element emitting blue light, a second light-emitting element emitting green light, and a third light-emitting element emitting red light. A first reflective electrode and a first transparent conductive film, a second reflective electrode and a second transparent conductive film, and a third reflective electrode and a third transparent conductive film are stacked in the first to third light-emitting elements, respectively. A first light-emitting layer, a charge-generation layer, a second light-emitting layer, and an electrode are stacked in this order over each of the first transparent conductive film, the second transparent conductive film, and the third transparent conductive film. The electrode has functions of transmitting and reflecting light. The first to third reflective electrodes contain silver. The first transparent conductive film is thicker than the third transparent conductive film. The third transparent conductive film is thicker than the second transparent conductive film.

Claims (183)

1. A light-emitting device comprising:

a first light-emitting element being capable of emitting blue light, the first light-emitting element comprising:

a first transparent conductive film;

a first light-emitting layer over the first transparent conductive film;

a charge-generation layer over the first light-emitting layer;

a second light-emitting layer over the charge-generation layer; and

an electrode over the second light-emitting layer,

a second light-emitting element being capable of emitting green light, the second light-emitting element comprising:

a second transparent conductive film;

the first light-emitting layer over the second transparent conductive film;

the charge-generation layer over the first light-emitting layer;

the second light-emitting layer over the charge-generation layer; and

the electrode over the second light-emitting layer, and

a third light-emitting element being capable of emitting red light, the third light-emitting element comprising:

a third transparent conductive film;

the first light-emitting layer over the third transparent conductive film;

the charge-generation layer over the first light-emitting layer;

the second light-emitting layer over the charge-generation layer; and

the electrode over the second light-emitting layer,

wherein the first transparent conductive film has a first region,

wherein the second transparent conductive film has a second region,

wherein the third transparent conductive film has a third region,

wherein the first region is thicker than the third region, and

wherein the third region is thicker than the second region.

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

wherein the first light-emitting layer comprises a first light-emitting substance emitting light of at least one of violet, blue, and blue green, and

wherein the second light-emitting layer comprises a second light-emitting substance emitting light of at least one of green, yellow green, yellow, orange, and red.

3. The light-emitting device according to claim 1 , further comprising a first reflective electrode in contact with the first transparent conductive film,

wherein an optical path length between the first reflective electrode and the first light-emitting layer is greater than or equal to 3/4λ B , λ B being a wavelength range of greater than or equal to 420 nm and less than or equal to 480 nm, and

wherein the first reflective electrode comprises silver.

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

a second reflective electrode in contact with the second transparent conductive film; and

a third reflective electrode in contact with the third transparent conductive film,

wherein an optical path length between the second reflective electrode and the first light-emitting layer is less than 3/4λ G , λ G being a wavelength range of greater than or equal to 500 nm and less than 550 nm,

wherein an optical path length between the third reflective electrode and the first light-emitting layer is less than 3/4λ R , λ R being a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm,

wherein the second reflective electrode comprises silver, and

wherein the third reflective electrode comprises silver.

5. The light-emitting device according to claim 1 , further comprising:

a second reflective electrode in contact with the second transparent conductive film; and

a third reflective electrode in contact with the third transparent conductive film,

wherein an optical path length between the second reflective electrode and the second light-emitting layer is around 3/4λ G , λ G being a wavelength range of greater than or equal to 500 nm and less than 550 nm,

wherein an optical path length between the third reflective electrode and the second light-emitting layer is around 3/4λ R , λ R being a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm,

wherein the second reflective electrode comprises silver, and

wherein the third reflective electrode comprises silver.

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

wherein the electrode is capable of transmitting light and reflecting light.

7. The light-emitting device according to claim 1 , further comprising:

a first optical element overlapping with the first light-emitting element;

a second optical element overlapping with the second light-emitting element; and

a third optical element overlapping with the third light-emitting element,

wherein the first optical element is capable of transmitting blue light,

wherein the second optical element is capable of transmitting green light, and

wherein the third optical element is capable of transmitting red light.

8. An electronic device comprising:

the light-emitting device according to claim 1 , and

a housing or a touch sensor.

9. A lighting device comprising:

the light-emitting device according to claim 1 , and

a housing or a touch sensor.

10. A light-emitting device comprising:

a first light-emitting element being capable of emitting blue light, the first light-emitting element comprising:

a first transparent conductive film;

a first light-emitting layer over the first transparent conductive film;

a charge-generation layer over the first light-emitting layer;

a second light-emitting layer over the charge-generation layer; and

an electrode over the second light-emitting layer,

a second light-emitting element being capable of emitting green light, the second light-emitting element comprising:

a second transparent conductive film;

the first light-emitting layer over the second transparent conductive film;

the charge-generation layer over the first light-emitting layer;

the second light-emitting layer over the charge-generation layer; and

the electrode over the second light-emitting layer,

a third light-emitting element being capable of emitting red light, the third light-emitting element comprising:

a third transparent conductive film;

the first light-emitting layer over the third transparent conductive film;

the charge-generation layer over the first light-emitting layer;

the second light-emitting layer over the charge-generation layer; and

the electrode over the second light-emitting layer, and

a fourth light-emitting element being capable of emitting yellow light, the fourth light-emitting element comprising:

a fourth transparent conductive film;

the first light-emitting layer over the fourth transparent conductive film;

the charge-generation layer over the first light-emitting layer;

the second light-emitting layer over the charge-generation layer; and

the electrode over the second light-emitting layer,

wherein the first transparent conductive film has a first region,

wherein the second transparent conductive film has a second region,

wherein the third transparent conductive film has a third region,

wherein the fourth transparent conductive film has a fourth region,

wherein the first region is thicker than the third region,

wherein the third region is thicker than the fourth region, and

wherein the fourth region is thicker than the second region.

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

wherein the first light-emitting layer comprises a first light-emitting substance emitting blue light, and

wherein the second light-emitting layer comprises a second light-emitting substance emitting light of at least one of green, yellow, and red.

12. The light-emitting device according to claim 10 , further comprising a first reflective electrode in contact with the first transparent conductive film,

wherein an optical path length between the first reflective electrode and the first light-emitting layer is greater than or equal to 3/4λ B , λ B being a wavelength range of greater than or equal to 420 nm and less than or equal to 480 nm, and

wherein the first reflective electrode comprises silver.

13. The light-emitting device according to claim 10 , further comprising:

a second reflective electrode in contact with the second transparent conductive film;

a third reflective electrode in contact with the third transparent conductive film; and

a fourth reflective electrode in contact with the fourth transparent conductive film,

wherein an optical path length between the second reflective electrode and the first light-emitting layer is less than 3/4λ G , λ G being a wavelength range of greater than or equal to 500 nm and less than 550 nm,

wherein an optical path length between the third reflective electrode and the first light-emitting layer is less than 3/4λ R , λ R being a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm, and

wherein an optical path length between the fourth reflective electrode and the first light-emitting layer is less than 3/4λ Y , λ Y being a wavelength range of greater than or equal to 550 nm and less than or equal to 580 nm,

wherein the second reflective electrode comprises silver,

wherein the third reflective electrode comprises silver, and

wherein the fourth reflective electrode comprises silver.

14. The light-emitting device according to claim 10 , further comprising:

a second reflective electrode in contact with the second transparent conductive film;

a third reflective electrode in contact with the third transparent conductive film; and

a fourth reflective electrode in contact with the fourth transparent conductive film,

wherein an optical path length between the second reflective electrode and the second light-emitting layer is around 3/4λ G , λ G being a wavelength range of greater than or equal to 500 nm and less than 550 nm,

wherein an optical path length between the third reflective electrode and the second light-emitting layer is around 3/4λ R , λ R being a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm, and

wherein an optical path length between the fourth reflective electrode and the second light-emitting layer is around 3/4λ Y , λ Y being a wavelength range of greater than or equal to 550 nm and less than or equal to 580 nm,

wherein the second reflective electrode comprises silver,

wherein the third reflective electrode comprises silver, and

wherein the fourth reflective electrode comprises silver.

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

wherein the electrode is capable of transmitting light and reflecting light.

16. The light-emitting device according to claim 10 , further comprising:

a first optical element overlapping with the first light-emitting element;

a second optical element overlapping with the second light-emitting element; and

a third optical element overlapping with the third light-emitting element,

wherein the first optical element is capable of transmitting blue light,

wherein the second optical element is capable of transmitting green light, and

wherein the third optical element is capable of transmitting red light.

17. An electronic device comprising:

the light-emitting device according to claim 10 , and

a housing or a touch sensor.

18. A lighting device comprising:

the light-emitting device according to claim 10 , and

a housing or a touch sensor.

19. A light-emitting device comprising:

a first light-emitting element being capable of emitting blue light, the first light-emitting element comprising:

a first reflective electrode;

a first transparent conductive film over the first reflective electrode;

a first light-emitting layer over the first transparent conductive film;

a charge-generation layer over the first light-emitting layer;

a second light-emitting layer over the charge-generation layer; and

an electrode over the second light-emitting layer,

a second light-emitting element being capable of emitting green light, the second light-emitting element comprising:

a second reflective electrode;

a second transparent conductive film over the second reflective electrode;

the first light-emitting layer over the second transparent conductive film;

the charge-generation layer over the first light-emitting layer;

the second light-emitting layer over the charge-generation layer; and

the electrode over the second light-emitting layer, and

a third light-emitting element being capable of emitting red light, the third light-emitting element comprising:

a third reflective electrode;

a third transparent conductive film over the third reflective electrode;

the first light-emitting layer over the third transparent conductive film;

the charge-generation layer over the first light-emitting layer;

the second light-emitting layer over the charge-generation layer; and

the electrode over the second light-emitting layer,

wherein the first to third electrodes each comprise silver,

wherein an optical path length between the first reflective electrode and the first light-emitting layer is longer than an optical path length between the third reflective electrode and the first light-emitting layer, and

wherein the optical path length between the third reflective electrode and the first light-emitting layer is longer than an optical path length between the second reflective electrode and the second light-emitting layer.

20. The light-emitting device according to claim 19 ,

wherein the first light-emitting layer comprises a first light-emitting substance emitting light of at least one of violet, blue, and blue green, and

wherein the second light-emitting layer comprises a second light-emitting substance emitting light of at least one of green, yellow green, yellow, orange, and red.

21. The light-emitting device according to claim 19 ,

wherein an optical path length between the first reflective electrode and the first light-emitting layer is greater than or equal to 3/4λ B , λ B being a wavelength range of greater than or equal to 420 nm and less than or equal to 480 nm.

22. The light-emitting device according to claim 19 ,

wherein an optical path length between the second reflective electrode and the first light-emitting layer is less than 3/4λ G , λ G being a wavelength range of greater than or equal to 500 nm and less than 550 nm, and

wherein an optical path length between the third reflective electrode and the first light-emitting layer is less than 3/4λ R , λ R being a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm.

23. The light-emitting device according to claim 19 ,

wherein an optical path length between the second reflective electrode and the second light-emitting layer is around 3/4λ G , λ G being a wavelength range of greater than or equal to 500 nm and less than 550 nm, and

wherein an optical path length between the third reflective electrode and the second light-emitting layer is around 3/4λ R , λ R being a wavelength range of greater than or equal to 600 nm and less than or equal to 740 nm.

24. The light-emitting device according to claim 19 ,

wherein the electrode is capable of transmitting light and reflecting light.

25. The light-emitting device according to claim 19 , further comprising:

a first optical element overlapping with the first light-emitting element;

a second optical element overlapping with the second light-emitting element; and

a third optical element overlapping with the third light-emitting element,

wherein the first optical element is capable of transmitting blue light,

wherein the second optical element is capable of transmitting green light, and

wherein the third optical element is capable of transmitting red light.

26. An electronic device comprising:

the light-emitting device according to claim 19 , and

a housing or a touch sensor.

27. A lighting device comprising:

the light-emitting device according to claim 19 , and

a housing or a touch sensor.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded May 18, 2015
From: SEO, SATOSHI; OHSAWA, NOBUHARU; SASAKI, TOSHIKI
To: SEMICONDUCTOR ENERGY LABORATORY CO., LTD.
Reel/Frame 035655/0778 →
Priority Claims (1)
JP 2014-101116 · May 15, 2014 · national
Continuity (1)
Related Publication 20150333229A1 · Nov 19, 2015