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Thermally-activated delayed fluorescent compound, and preparation method and application thereof

A fluorescent compound, thermal activation delay technology, applied in chemical instruments and methods, luminescent materials, organic chemistry, etc., can solve problems such as inability to obtain device performance, and achieve the effects of high rigidity, increased stability, and improved lifespan

Inactive Publication Date: 2019-08-16
WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, green and sky blue TADF materials have achieved an external quantum efficiency (EQE) of more than 30%; however, long-wavelength TADF materials cannot obtain excellent device performance due to the energy gap law.

Method used

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  • Thermally-activated delayed fluorescent compound, and preparation method and application thereof
  • Thermally-activated delayed fluorescent compound, and preparation method and application thereof
  • Thermally-activated delayed fluorescent compound, and preparation method and application thereof

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Embodiment Construction

[0037] A thermally activated delayed fluorescence (TADF) compound involved in the present invention, its preparation method and technical solutions for its application will be further described in detail below with reference to the accompanying drawings and examples.

[0038] One aspect of the present invention is to provide a thermally activated delayed fluorescence compound comprising a donor unit D and an acceptor unit A, wherein the donor unit D and the acceptor unit A are combined as D n - A structure wherein n=1, 2 or 3. Wherein the structure of the donor unit D includes a diphenylamino molecular structure, and the structure of the acceptor unit A includes a trimeric dioxybenzothiophene molecular structure.

[0039] Specifically, the molecular structure general formula adopted by the donor unit D is the following formula or one of the derivatives of the following formula:

[0040]

[0041] Further, in different embodiments, the molecular structure general formula ado...

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Abstract

The present invention provides a thermally-activated delayed fluorescent compound. The thermally-activated delayed fluorescent compound comprises a donor unit D and an acceptor unit A, and the structural general formula is Dn-A (n = 1 or 2 or 3), wherein the molecular structure of the donor unit D comprises a diphenylamino molecular structure, and the molecular structure of the acceptor unit A comprises a trimeric dioxobenzothiophene molecular structure. The novel structure between the donor and the acceptor of the thermally-activated delayed fluorescent compound makes the compound molecule have a high intersystem crossing rate constant and an inverse intersystem crossing rate constant, so the decrease of the radiation transition rate due to the energy gap rule is effectively inhibited, thereby a high PLQY is obtained, and the application of a deep red light TADF compound material with a high-efficiency and weak roll-off in electroluminescent devices is achieved.

Description

technical field [0001] The present invention relates to the field of materials used in functional layers in OLED display panels, in particular, the light-emitting layer involves thermally activated delayed fluorescence (TADF) compound materials used. Background technique [0002] It is known that organic light-emitting diodes (organic lighting-emitting diodes, OLEDs) have active light emission, large viewing angle, fast response speed, wide temperature range, low driving voltage, low power consumption, high brightness, simple production process, light and thin, Moreover, it has the advantages of flexible display and other advantages, showing huge application prospects, and attracting the attention of scientific researchers and companies. [0003] At present, Samsung and LG have realized the application of OLEDs on mobile phone screens. Furthermore, in the OLED display panel, the quality of the material used for the light-emitting layer plays a decisive role in whether the O...

Claims

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Application Information

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IPC IPC(8): C07D495/14C09K11/06H01L51/54
CPCC07D495/14C09K11/06C09K2211/1007C09K2211/1014C09K2211/1092H10K85/631H10K85/6576
Inventor 王彦杰
Owner WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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