Thermo-activating delayed fluorescent material allowing solution processing and preparation method thereof

A technology of thermally activated delayed and fluorescent materials, applied in the fields of luminescent materials, chemical instruments and methods, semiconductor/solid-state device manufacturing, etc. performance, the effect of reducing concentration quenching, and improving performance
CN108586318AActive Publication Date: 2018-09-28SOUTHEAST UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SOUTHEAST UNIV
Publication Date
2018-09-28

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Abstract

The invention discloses a thermo-activating delayed fluorescent material allowing solution processing and a preparation method thereof, wherein the molecular structure of the material is composed of two parts: one is a core having property of thermo-activating delayed fluorescence, the other is a group connected via an alkyl chain and having high triplet state energy level. The molecular structureis represented as the formula (I), wherein at most one of R1 and R2 is hydrogen, others being the group connected via an alkyl chain and having high triplet state energy level. The novel material hasthe following advantages: due to the steric-hinerance effect of surrounding branch chains, concentration quenching of a triplet-state exciton is effectively reduced, thus improving performance of a light-emitting device. By introducing the alkyl chain, dissolubility and film-forming performance of the material are effectively enhanced. A result proves that the thermo-activating delayed fluorescent material has large molecular weight and excellent film-forming performance, so that the material is suitable for preparing an organic light-emitting device in a wet process. With increase of the surrounding branch chains, the performance of the device can be improved greatly.
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Description

technical field

[0001] The invention belongs to the field of organic electroluminescent materials, and in particular relates to a novel organic luminescent material, that is, a solution-processable heat-activated delayed fluorescent material. Background technique

[0002] Organic light-emitting diodes (OLEDs) are known as the most promising next-generation displays due to their low driving voltage, fast response, high luminous efficiency, simple manufacturing process, and easy realization of full-color display. However, the thermally activated delayed fluorescence material (TADF) achieves 100% internal quantum efficiency because it can make full use of single triplet excitons. Therefore, TADF materials are widely used in organic light emitting diodes. So far, researchers of TADF materials have mainly focused on how to improve the performance of OLED devices and their color purity.

[0003] In small molecule TADF materials, researchers have made great achievements in these ...

Claims

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