Granted Patent B2

US 12,364,115 · App. 17/780,247 · Granted Jul 15, 2025

Inventors: Takeyoshi Watabe (Kanagawa, JP); Airi Ueda (Kanagawa, JP); Nobuharu Ohsawa (Kanagawa, JP); Satoshi Seo (Kanagawa, JP)

Assignee: Semiconductor Energy Laboratory Co., Ltd.

H10K59/126H10K50/858H10K50/81H10K50/828H10K59/65

Abstract

Claims (59)

1. A light-emitting device comprising:

a first electrode;

a second electrode;

an EL layer between the first electrode and the second electrode; and

a first layer,

wherein the EL layer emits light having a peak of an emission spectrum in a wavelength range of greater than or equal to 750 nm and less than or equal to 1000 nm,

wherein one of the first electrode and the second electrode is an electrode having a transmitting property with respect to light with a peak wavelength of the emission spectrum of the EL layer,

wherein the first layer is in contact with a surface of the electrode having a transmitting property, which is opposite to a surface where the EL layer is formed,

wherein the first layer contains an organic compound, and

wherein the first layer has the local maximum value of an extinction coefficient k in a visible light region.

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

wherein a refractive index n of the first layer is greater than or equal to 1.9 in the peak wavelength of the emission spectrum of the EL layer.

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

wherein the other of the first electrode and the second electrode is an electrode having a reflective property with respect to light with the peak wavelength of the emission spectrum of the EL layer.

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

wherein the electrode having a transmitting property is a transflective electrode further having a reflective property with respect to light with the peak wavelength of the emission spectrum of the EL layer.

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

wherein the second electrode is the electrode having a transmitting property, and

wherein the second electrode is a cathode.

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

wherein the first electrode is the electrode having a transmitting property, and

wherein the first electrode is an anode.

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

wherein one kind of the organic compound is contained in the first layer.

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

wherein the organic compound contained in the first layer is a substance that is evaporated by resistance heating.

9. An electronic device comprising the light-emitting device according to claim 1 , and at least one of a sensor, an operation button, a speaker, and a microphone.

10. A light-emitting apparatus comprising the light-emitting device according to claim 1 , and at least one of a transistor and a substrate.

11. A lighting device comprising the light-emitting device according to claim 1 and a housing.

12. A light-emitting device comprising:

a first electrode;

a second electrode;

an EL layer between the first electrode and the second electrode; and

a first layer,

wherein the EL layer emits light having a peak of an emission spectrum in a wavelength range of greater than or equal to 750 nm and less than or equal to 1000 nm,

wherein one of the first electrode and the second electrode is an electrode having a transmitting property with respect to light with a peak wavelength of the emission spectrum of the EL layer,

wherein the first layer is in contact with a surface of the electrode having a transmitting property, which is opposite to a surface where the EL layer is formed,

wherein the first layer contains an organic compound, and

wherein the maximum value of an extinction coefficient k in a visible light region of the first layer is greater than or equal to 0.05.

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

wherein a refractive index n of the first layer is greater than or equal to 1.9 in the peak wavelength of the emission spectrum of the EL layer.

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

wherein the organic compound contained in the first layer is a substance that is evaporated by resistance heating.

15. An electronic device comprising the light-emitting device according to claim 12 , and at least one of a sensor, an operation button, a speaker, and a microphone.

16. A light-emitting device comprising:

a first electrode;

a second electrode;

an EL layer between the first electrode and the second electrode; and

a first layer,

wherein the EL layer emits light having a peak of an emission spectrum in a wavelength range of greater than or equal to 750 nm and less than or equal to 1000 nm,

wherein one of the first electrode and the second electrode is an electrode having a transmitting property with respect to light with a peak wavelength of the emission spectrum of the EL layer,

wherein the first layer is in contact with a surface of the electrode having a transmitting property, which is opposite to a surface where the EL layer is formed,

wherein the first layer contains an organic compound, and

wherein the maximum value of an extinction coefficient k in a visible light region of the first layer is greater than or equal to 0.2.

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

wherein a refractive index n of the first layer is greater than or equal to 1.9 in the peak wavelength of the emission spectrum of the EL layer.

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

wherein the organic compound contained in the first layer is a substance that is evaporated by resistance heating.

19. An electronic device comprising the light-emitting device according to claim 16 , and at least one of a sensor, an operation button, a speaker, and a microphone.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (23)