Complexes of red light iridium by using nitrogen heterocycles in quinoline as ligand, and application

A technology of iridium complex and nitrogen heterocycle is applied to red light iridium complex with quinoline nitrogen heterocycle as ligand and its application field, which can solve the problem that it is not easy to synthesize in large quantities, the internal quantum efficiency cannot exceed 25%, and the synthetic The method is complicated and other problems, to achieve the effect of easy synthesis and purification, short life, high efficiency red light emission

Active Publication Date: 2005-11-16
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The triplet excitons exhibit non-radiative decay due to their long lifetime and spin-forbidden nature, which limits the internal quantum efficiency of the device to no more than 25%.
The synthesis methods of these ligands are complex and not easy to synthesize in large quantities

Method used

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  • Complexes of red light iridium by using nitrogen heterocycles in quinoline as ligand, and application
  • Complexes of red light iridium by using nitrogen heterocycles in quinoline as ligand, and application
  • Complexes of red light iridium by using nitrogen heterocycles in quinoline as ligand, and application

Examples

Experimental program
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Effect test

Embodiment 1

[0062] For the examples given, use the complex (1-NAPQ) 2 Ir(acac) is doped in the CBP host material to make organic EL devices. First, 50nm of N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-diphenyl-4,4'- is deposited on the surface coated with ITO glass. Diamine (NPB) serves as the hole transport layer. Then, CBP was deposited on the hole transport layer to form a 30nm light-emitting layer, which was doped with 3% (1-NAPQ) 2 Ir(acac). Finally, deposit a hole blocking layer (BCP: 10mm), an electron transport layer (Alq 3 : 40nm), interface layer (LiF: 1nm) and cathode (Al: 100nm).

[0063] The resulting EL device is at 100cd / m 2 The luminous efficiency is 2.2cd / A, the external quantum efficiency is 3.0%, the emission peak is 642nm, the half-value width is 35nm, the color coordinate CIE value x=0.71, y=0.29.

Embodiment 2

[0065] For this example, a complex (TPAPQ) is used 2 Ir(acac) is doped in the CBP host material to make organic EL devices. First, 50nm of N,N'-bis(1-naphthyl)-N,N'-diphenyl-1,1'-diphenyl-4,4'- is deposited on the surface coated with ITO glass. Diamine (NPB) serves as the hole transport layer. Then, CBP was deposited on the hole transport layer to form a 30nm light-emitting layer, which was doped with 7% (TPAPQ) 2 Ir(acac). Finally, a hole blocking layer (BCP: 10nm), an electron transport layer (Alq 3 : 40nim), interface layer (LiF: 1nm) and cathode (Al: 100nm).

[0066] The resulting EL device is at 100cd / m 2 The luminous efficiency is 12.2cd / A, the external quantum efficiency is 9.0%, the emission peak is 616nm, the half-value width is 48nm, the color coordinate CIE value x=0.67, y=0.32.

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Abstract

A red-light iridium match using quinoline-type azacyclic compound as its ligand is disclosed. It can be used to prepare the organic electroluminescent device emitting red light.

Description

Technical field [0001] The invention relates to an iridium complex based on a quinoline nitrogen heterocycle as a ligand and its application as a red light material in an organic electroluminescent device. technical background [0002] In 1987, C.W.Tang et al. first reported aluminum octahydroxyquinoline (Alq 3 Since the electroluminescence phenomenon of ), the research of organic light-emitting diode has aroused widespread interest in academia and industry. According to the spin statistics theory, in most organic light-emitting diodes, the ratio of singlet excitons to triplet excitons is 1:3. The triplet excitons exhibit non-radiative decay due to their long lifetime and the nature of spin forbidden, which limits the internal quantum efficiency of the device to not more than 25%. The transition metal complexes have strong spin-orbit coupling due to the heavy atom effect of the metal atoms, which increases the effective intersystem crossing between the singlet state and the tripl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F15/00
Inventor 王利祥丁军桥程延祥耿延候谢志元
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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