Light-emitting device having fluorescent and phosphorescent materials

Patent metadata

Field	Value
Publication number	US-11189676-B2
Application number	US-201916371583-A
Country	US
Kind code	B2
Filing date	Apr 1, 2019
Priority date	Oct 16, 2008
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

It is an object to provide a flexible light-emitting device with long lifetime in a simple way and to provide an inexpensive electronic device with long lifetime using the flexible light-emitting device. A flexible light-emitting device is provided, which includes a substrate having flexibility and a light-transmitting property with respect to visible light; a first adhesive layer over the substrate; an insulating film containing nitrogen and silicon over the first adhesive layer; a light-emitting element including a first electrode, a second electrode facing the first electrode, and an EL layer between the first electrode and the second electrode; a second adhesive layer over the second electrode; and a metal substrate over the second adhesive layer, wherein the thickness of the metal substrate is 10 μm to 200 μm inclusive. Further, an electronic device using the flexible light-emitting device is provided.

First claim

What is claimed is:

1. A light-emitting device comprising:
a substrate having light-transmitting property with respect to visible light;
a first insulating layer over the substrate;
a second insulating layer over the first insulating layer;
a third insulating layer over the second insulating layer;
a light-emitting element over the third insulating layer; and
a metal substrate over the light-emitting element,
wherein the light-emitting element comprises a first light-emitting layer and a second light-emitting layer over the first light-emitting layer,
wherein the first light-emitting layer comprises a fluorescent material,
wherein the second light-emitting layer comprises a phosphorescent material,
wherein oxygen content in the first insulating layer is larger than nitrogen content in the first insulating layer,
wherein nitrogen content in the second insulating layer is larger than oxygen content in the second insulating layer, and
wherein oxygen content in the third insulating layer is larger than nitrogen content in the third insulating layer.

2. The light-emitting device according to claim 1 , wherein the fluorescent material is a blue fluorescent material.

3. The light-emitting device according to claim 1 , wherein the phosphorescent material is a red phosphorescent material.

4. 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.

5. The light-emitting device according to claim 1 , wherein the light-emitting element emits white light.

6. The light-emitting device according to claim 1 , further comprising a color filter overlapping with the light-emitting element.

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

8. A light-emitting device comprising:
a substrate having light-transmitting property with respect to visible light;
a first insulating layer over the substrate;
a second insulating layer over the first insulating layer;
a third insulating layer over the second insulating layer;
a transistor over the third insulating layer;
a light-emitting element over the third insulating layer and the transistor;
a color filter between the transistor and the light-emitting element; and
a metal substrate over the light-emitting element,
wherein the light-emitting element comprises a first light-emitting layer and a second light-emitting layer over the first light-emitting layer,
wherein the first light-emitting layer comprises a fluorescent material, and
wherein the second light-emitting layer comprises a phosphorescent material,
wherein oxygen content in the first insulating layer is larger than nitrogen content in the first insulating layer,
wherein nitrogen content in the second insulating layer is larger than oxygen content in the second insulating layer, and
wherein oxygen content in the third insulating layer is larger than nitrogen content in the third insulating layer.

9. The light-emitting device according to claim 8 , wherein the fluorescent material is a blue fluorescent material.

10. The light-emitting device according to claim 8 , wherein the phosphorescent material is a red phosphorescent material.

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

12. The light-emitting device according to claim 8 , wherein the light-emitting element emits white light.

13. The light-emitting device according to claim 8 , wherein the light-emitting device is a bottom emission light-emitting device.

14. A light-emitting device comprising:
a substrate having light-transmitting property with respect to visible light;
a first insulating layer over the substrate;
a second insulating layer over the first insulating layer;
a third insulating layer over the second insulating layer;
a light-emitting element over the third insulating layer; and
a metal substrate over the light-emitting element,
wherein the light-emitting element comprises a first light-emitting layer and a second light-emitting layer over the first light-emitting layer,
wherein light emission from the first light-emitting layer and light emission from the second light-emitting layer have complementary colors to each other,
wherein the light emission from the first light-emitting layer is blue,
wherein oxygen content in the first insulating layer is larger than nitrogen content in the first insulating layer,
wherein nitrogen content in the second insulating layer is larger than oxygen content in the second insulating layer, and
wherein oxygen content in the third insulating layer is larger than nitrogen content in the third insulating layer.

15. The light-emitting device according to claim 14 , wherein the light emission from the second light-emitting layer is yellow.

16. The light-emitting device according to claim 14 ,
wherein the first light-emitting layer comprises a fluorescent material, and
wherein the second light-emitting layer comprises a phosphorescent material.

17. The light-emitting device according to claim 14 , wherein the light-emitting element emits white light.

18. The light-emitting device according to claim 14 , further comprising a color filter overlapping with the light-emitting element.

19. The light-emitting device according to claim 14 , wherein the light-emitting device is a bottom emission light-emitting device.

Assignees

• Semiconductor Energy Lab

Inventors

• Hatano Kaoru
• Seo Satoshi
• Nagata Takaaki
• Okano Tatsuya

Classifications

• G06F1/1641

  the display being formed by a plurality of foldable display components (G06F1/1647 takes precedence) · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/8722 Primary

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• H10K59/8721

  Metallic sealing arrangements · CPC title

• H10K59/80524

  Transparent cathodes, e.g. comprising thin metal layers · CPC title