Thermally activated delayed fluorescence material and its preparation method, organic electroluminescent device
A technology of thermally activated delayed and fluorescent materials, applied in luminescent materials, electro-solid devices, chemical instruments and methods, etc., can solve the problem that light cannot be taken out, and achieve the effect of improving synthesis efficiency, weak EQE, and improving luminous efficiency.
Active Publication Date: 2021-01-01
WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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However, most thermally activated delayed fluorescent materials have dipole orientations of only 67%-77% without the use of a light-coupling extraction layer, resulting in 20%-30% of the light not being extracted, making the external quantum efficiency of the device under 25%
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[0035] The following description of the embodiments refers to the accompanying drawings to illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "top", "bottom", etc., are only for reference to the attached drawings. direction. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention.
[0036] The invention provides a thermally activated delayed fluorescent material, which has an A-D-A structure, wherein A is an electron acceptor and D is an electron donor.
[0037] The structural formula of the electron donor includes at least one of the following structural formulas:
[0038]
[0039]
[0040] The electron acceptor structural formula includes at least one of the following structural formulas:
[0041]
[0042] When the structure of the electron donor is...
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Abstract
The invention discloses a thermally activated delayed fluorescent material, a preparation method thereof, and an organic electroluminescence device. The thermally activated delayed fluorescent material has an A-D-A structure, wherein A is an electron acceptor and D is an electron donor , the external quantum efficiency of the thermally activated delayed fluorescent material is higher than 40%. An A-D-A structure is formed in the thermally activated delayed fluorescent material, so that it has a high dipole orientation at the molecular level, so as to improve external quantum efficiency and simultaneously improve the synthesis efficiency of the thermally activated delayed fluorescent material.
Description
technical field [0001] The invention relates to the field of display technology, in particular to a thermally activated delayed fluorescent material, a preparation method thereof, and an organic electroluminescent device. Background technique [0002] Organic light-emitting diodes (organic lighting-emitting diodes, OLEDs), due to 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, and can The advantages of flexible display have shown great application prospects in the fields of OLED display and lighting, attracting the attention of researchers and companies. At present, Samsung and LG have realized the application of OLEDs in mobile phones. [0003] In organic electroluminescent devices, the quality of light-emitting layer materials plays a decisive role in the industrialization of organic electroluminescent devices. The usual light-e...
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IPC IPC(8): C07D471/04C09K11/06H01L51/50H01L51/54
CPCC09K11/06C07D471/04C09K2211/1007C09K2211/1029C09K2211/1074H10K85/654H10K85/6572H10K50/11
Inventor 王彦杰
Owner WUHAN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD