LIGHT-EMITTING BODY, LIGHT-EMITTING LAYER, AND LIGHT-EMITTING DEVICE

• US 20120205687A1
• Filed: 02/10/2012
• Published: 08/16/2012
• Est. Priority Date: 02/16/2011
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: YAMAZAKI, Shunpei, SEO, Satoshi, OHSAWA, Nobuharu, SHITAGAKI, Satoko, INOUE, Hideko, KADOMA, Hiroshi, OSAKA, Harue, SUZUKI, Kunihiko
• Granted Patent: US 9,203,044 B2
• Time in Patent Office: Days
• US Class Current: 257/89
• CPC Class Codes: H10K 2101/10 Triplet emission
• CPC Class Codes: H10K 2101/90 Multiple hosts in the emissive layer
• CPC Class Codes: H10K 50/11 characterised by the electroluminescent [EL] layers
• CPC Class Codes: H10K 50/13 comprising stacked EL layers within one EL unit

Abstract

An organic light-emitting element having high efficiency and long lifetime is provided. An organic light-emitting body is provided which includes a host having a high electron-transport property (n-type host), a host having a high hole-transport property (p-type host), and a guest such as an iridium complex and in which the n-type host and the p-type host are located so as to be adjacent to each other. When an electron and a hole are injected to such a light-emitting body, the electron is trapped by the n-type host and the hole is trapped by the p-type host. Then, both the electron and the hole are injected to the guest, and thus the guest is brought into an excited state. In this process, less thermal deactivation occurs and the working rate of the guest is high; thus, highly efficient light emission can be obtained.

Claims

1. An organic light-emitting body comprising:

a guest cluster including at least one guest molecule;

an n-type host cluster including at least one n-type host molecule; and

a p-type host cluster including at least one p-type host molecule,

wherein the guest cluster is sandwiched between the n-type host cluster and the p-type host cluster.

2. A light-emitting layer comprising the organic light-emitting body according to claim 1.

3. A light-emitting element comprising the light-emitting layer according to claim 2.

4. The light-emitting element according to claim 3, comprising two or more light-emitting layers.

5. The light-emitting element according to claim 3, wherein at least two light-emitting layers emit light with different wavelengths.

6. The organic light-emitting body according to claim 1, wherein the guest molecule is an iridium complex.

7. An organic light-emitting body comprising:

a plurality of guest clusters, wherein each of the guest clusters includes at least one guest molecule;

a plurality of n-type host clusters, wherein each of the n-type host clusters includes at least one n-type host molecule; and

a plurality of p-type host clusters, wherein each of the p-type host clusters includes at least one p-type host molecule,

wherein the n-type host clusters and the p-type host clusters are linearly arranged with the guest clusters sandwiched therebetween.

8. A light-emitting layer comprising the organic light-emitting body according to claim 7.

9. A light-emitting element comprising the light-emitting layer according to claim 8.

10. The light-emitting element according to claim 9, comprising two or more light-emitting layers.

11. The light-emitting element according to claim 9, wherein at least two light-emitting layers emit light with different wavelengths.

12. The organic light-emitting body according to claim 7, wherein the guest molecule is an iridium complex.

13. A light-emitting layer comprising a plurality of the organic light-emitting bodies according to claim 7,

wherein the organic light-emitting bodies are arranged parallel each other.

14. An organic light-emitting body comprising:

a guest cluster including at least one guest molecule;

a n-type host cluster including at least one n-type host molecule; and

a p-type host cluster including at least one p-type host molecule,

wherein the guest cluster is next to the n-type host cluster, and

wherein the guest cluster is next to the p-type host cluster.

15. A light-emitting layer comprising the organic light-emitting body according to claim 14.

16. A light-emitting element comprising the light-emitting layer according to claim 15.

17. The light-emitting element according to claim 16, comprising two or more light-emitting layers.

18. The light-emitting element according to claim 16, wherein at least two light-emitting layers emit light with different wavelengths.

19. The organic light-emitting body according to claim 14, wherein the guest molecule is an iridium complex.

20. A light-emitting layer comprising a plurality of the organic light-emitting bodies according to claim 14,

wherein the guest cluster, the n-type host cluster and the p-type host cluster are linearly arranged, and

wherein the organic light-emitting bodies are arranged parallel each other.