Organic electroluminescent material and light-emitting device thereof

An electroluminescent material and luminescent technology, applied in the direction of organic light-emitting devices, luminescent materials, organic semiconductor device materials, etc., can solve the problems of spectral Stokes shift, inability to obtain narrow peak width optical characteristics, etc.

Inactive Publication Date: 2017-12-22
AAC TECH NANJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The molecular structure of traditional TADF materials determines that it cannot obtain narrow-band optical properties. This is because the traditional TADF materials are D-A separation, HOMO-LUMO separation chemical structure, resulting in excited state molecular (S1, T1) structure Structural relaxation occurs, causing Stokes shift in the spectrum, thus forming a FWHM of 60-100nm

Method used

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  • Organic electroluminescent material and light-emitting device thereof
  • Organic electroluminescent material and light-emitting device thereof
  • Organic electroluminescent material and light-emitting device thereof

Examples

Experimental program
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preparation example

[0149] 1. Synthesis and characterization of CZP2B-1:

[0150]

[0151] The chlorine substituent A of dicarbazole was used as raw material to prepare CZP2B-1. First, take 1mol of compound A, add 1.2mol tert-butyllithium, tert-butylbenzene, keep warm at 60°C for 2 hours, cool down to room temperature, add dropwise 1.2mol BBr 3 After fully reacting for half an hour, water was added to precipitate a solid, which was washed with n-hexane in sequence and recrystallized with ethanol to obtain compound CZP2B-1 with a yield of 40%.

[0152] CZP2B-1 in CH 2 Cl 2 The UV absorption spectrum of the solution is as image 3 As shown, 422.6nm is mainly the absorption peak of S0-S1, the maximum molar absorption main peak of CZP2B-1 is at 422.6nm, and the absorption intensity ε reaches 2900, corresponding to the electronic transition of HOMO→LUMO; the second main absorption peak is located at 290nm Nearby, the absorption intensity ε reaches 4000.

[0153] The carbon NMR spectrum of CZP2...

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Abstract

The present invention relates to the technical field of organic light-emitting materials, and in particular relates to an organic electroluminescent material and a light-emitting device thereof. The organic electroluminescent material is selected from the compounds as shown in Formula I. A rigid molecular structure is obtained by forming of a push-pull electron coplane of electron donating Donor and electron-withdrawing acceptor, certain separation of HOMO-LUMO is obtained so as to obtain narrow FWHM and high transition rate constant Kr.

Description

technical field [0001] The invention relates to the technical field of organic light-emitting materials, in particular to an organic electroluminescence material and a light-emitting device thereof. Background technique [0002] According to the mechanism of electroluminescence, OLED materials are divided into fluorescent OLED materials and phosphorescent OLEDs. Fluorescent OLED materials are purely organic materials that do not contain heavy metals. Therefore, in theory, they can only achieve an internal quantum efficiency of 25%, resulting in a theoretical upper limit of 5% for the external quantum efficiency of fluorescence. Phosphorescent luminescent materials can theoretically achieve 100% quantum luminous efficiency due to the effect of heavy metals. [0003] Recently, thermally activated delayed fluorescence (TADF) material has received widespread attention, which is a kind of OLED material that uses energy up-conversion mechanism to emit light. Due to the separatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F5/02C09K11/06H01L51/50H01L51/54
CPCC09K11/06C07F5/02C09K2211/1096H10K85/322H10K85/657H10K50/11H10K2102/00H10K2102/301
Inventor 谢再锋
Owner AAC TECH NANJING
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