Organic light-emitting element

• US 10,483,488 B2
• Filed: 12/18/2014
• Issued: 11/19/2019
• Est. Priority Date: 12/26/2013
• Status: Active Grant

• Current Assignee: Toray Industries Incorporated
• Original Assignee: Toray Industries Incorporated
• Inventors: Jin, Guangnan, Wang, Peng, Xu, Fangrong, Zhong, Lingzhi, Ishigaki, Takeshi, Tanaka, Daisaku, Ikeda, Takeshi, Nishiyama, Takuya
• Primary Examiner(s): Yang, Jay
• Application Number:
  US15/108,149
• Publication Number:
  US 20170018733A1
• Time in Patent Office: 1,797 Days
• Field of Search: None
• CPC Class Codes: G02F 1/133602 Direct backlight
• CPC Class Codes: H10K 50/818 Reflective anodes, e.g. ITO combined with thick metallic layers
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/858 comprising refractive means, e.g. lenses
• CPC Class Codes: H10K 85/622 containing four rings, e.g. pyrene
• CPC Class Codes: H10K 85/626 containing more than one polycyclic condensed aromatic rings, e.g. bis-anthracene
• CPC Class Codes: H10K 85/633 comprising polycyclic condensed aromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/636 comprising heteroaromatic hydrocarbons as substituents on the nitrogen atom
• CPC Class Codes: H10K 85/653 comprising only oxygen as heteroatom
• CPC Class Codes: H10K 85/654 comprising only nitrogen as heteroatom H10K85/652 takes precedence
• CPC Class Codes: H10K 85/655 comprising only sulfur as heteroatom
• CPC Class Codes: H10K 85/6572 comprising only nitrogen in the heteroaromatic polycondensed ring system, e.g. phenanthroline or carbazole

Abstract

An organic light-emitting element, including a substrate, a first electrode, a light-emitting layer containing one organic or more layer film, and a light-emitting element of a second electrode are disclosed. The light-emitting element is provided with a covering layer. For the organic material contained in covering layer, at least one point in the wavelength range between 430 nm and 460 nm the attenuation coefficient is greater than 0.10 while in the wavelength range of 460 nm to 500 nm its attenuation coefficient is 0.10 or below. The organic light-emitting element achieves high light-emitting efficiency and color reproducibility, and can be used as organic EL display, backlight source for liquid crystal display, illumination, light source for measurement devices, indication board or identification lamp etc.

Claims

1. An organic light-emitting element, comprising a substrate, a first electrode, one layer or more of organic film including a light-emitting layer, and a second electrode element;

the light-emitting element comprising a covering layer;

the covering layer containing an organic material;

at least one point in the wavelength range between 430 nm and 460 nm the attenuation coefficient being greater than 0.10 while in the wavelength range of 460 nm to 500 nm its attenuation coefficient being 0.10 or below.

2. The organic light-emitting element of claim 1, wherein at least one point in the wavelength range between 430 nm and 460 nm its attenuation coefficient is greater than 0.12 while in the wavelength range of 460 nm to 500 nm its attenuation coefficient is 0.10 or below.

3. The organic light-emitting element of claim 1, wherein the organic material contained in the covering layer is one or more compounds that have thiophene-based structure, furan-based structure or pyrrole-based structure.

4. The organic light-emitting element of claim 3, wherein the compound having thiophene-based structure, furan-based structure or pyrrole-based structure is as expressed in Formula (1):

5. The organic light-emitting element of claim 3, wherein the compound having thiophene-based structure, furan-based structure or pyrrole-based structure is as expressed in Formula (2):

6. The organic light-emitting element of claim 5, wherein n₁ is 1 or 2.

7. The organic light-emitting element of claim 6, wherein the compound having thiophene-based structure, furan-based structure or pyrrole-based structure is as expressed in Formula (3):

8. The organic light-emitting element of claim 1, wherein the covering layer contains a compound having pyrene-based structure.

9. The organic light-emitting element of claim 8, wherein the compound having pyrene-based structure is as expressed in Formula (4):

10. The organic light-emitting element of claim 9, wherein the compound having pyrene-based structure is as expressed in Formula (5):

11. The organic light-emitting element of claim 10, wherein n₂ is 1 or 2.

12. The organic light-emitting element of claim 11, wherein the compound having pyrene-based structure is as expressed in Formula (6):

13. The organic light-emitting element of claim 1, wherein the covering layer contains a compound having anthracene-based structure.

14. The organic light-emitting element of claim 13, wherein the compound having anthracene-based structure is as expressed in Formula (7):

15. The organic light-emitting element of claim 14, wherein the compound having anthracene-based structure is as expressed in Formula (8):

16. The organic light-emitting element of claim 15, wherein n₃ is 1 or 2.

17. The organic light-emitting element of claim 16, wherein the compound having anthracene-based structure is as expressed in Formula (9):