Light emitting diode and display device including the same

Patent metadata

Field	Value
Publication number	US-12356795-B2
Application number	US-202318347995-A
Country	US
Kind code	B2
Filing date	Jul 6, 2023
Priority date	Jan 21, 2020
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

A light emitting diode of an embodiment includes a first electrode, a hole transport region disposed on the first electrode, an emission layer disposed on the hole transport region, an electron transport region disposed on the emission layer, and a second electrode disposed on the electron transport region. The hole transport region includes a first hole transport layer disposed adjacent to the first electrode and having a first refractive index, a second hole transport layer disposed adjacent to the emission layer and having a second refractive index, and a third hole transport layer disposed between the first hole transport layer and the second hole transport layer and having a third refractive index which is greater than each of the first refractive index and the second refractive index, thereby showing high light extraction efficiency and high emission efficiency properties.

First claim

What is claimed is:

1. An amine compound represented by Formula 1:

wherein in Formula 1,
Ar a to Ar c are each independently a substituted or unsubstituted aryl group of 6 to 30 ring-forming carbon atoms, or a substituted or unsubstituted heteroaryl group of 3 to 30 ring-forming carbon atoms,
at least two of R a to R c are each independently an adamantyl group or a cyclohexyl group, and
the remainder of R a to R c is a hydrogen atom, a deuterium atom, a halogen atom, a cyano group, a substituted or unsubstituted oxy group, a substituted or unsubstituted thio group, a substituted or unsubstituted amine group, or a substituted or unsubstituted alkyl group of 1 to 20 carbon atoms.

2. The amine compound of claim 1 , wherein Ar a to Ar c are each independently a substituted or unsubstituted phenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted biphenyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted fluorenyl group, a substituted or unsubstituted carbazole group, a substituted or unsubstituted dibenzofuranyl group, or a substituted or unsubstituted dibenzothiophenyl group.

3. The amine compound of claim 1 , wherein Formula 1 is represented by any one selected from Formula 1A to 1C:

wherein in Formula 1A to Formula 1C, R a , Ar a , Ar b , and Ar c are each independently the same as defined in Formula 1.

4. The amine compound of claim 1 , wherein a refractive index is in a range of 1.30 to 1.80 at a wavelength of 460 nm.

5. The amine compound of claim 1 , wherein the amine compound is a material for hole transport layer of a light emitting diode.

6. The amine compound of claim 1 , wherein Formula 1 is any one selected from the compounds represented by Compound Group 1:

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Bora
• Ko Hyomin
• Cho Illhun
• Jeong Eunjae
• Kim Minji
• Jo Sohee
• Kim Dongjun
• Pak Hankyu
• Han Sanghyun

Classifications

• H10K59/879

  comprising refractive means, e.g. lenses · CPC title

• H10K59/80518

  Reflective anodes, e.g. ITO combined with thick metallic layers · CPC title

• C07D333/76

  Dibenzothiophenes · CPC title

• C07D307/91

  Dibenzofurans; Hydrogenated dibenzofurans · CPC title

• C07D209/88

  with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to carbon atoms of the ring system · CPC title