Thermally activated delayed fluorescent molecular material and its synthesis method, electroluminescent device

Abstract

The invention provides a heat-activated delayed fluorescence molecular material and its synthesis method, and an organic electroluminescent device. By synthesizing a heat-activated delayed fluorescence molecule containing an indolobenzoselenium heteroaromatic ring donor, the donor's donor can be increased. The electronic ability can effectively suppress the non-radiative transition rate, thereby improving the luminescence quantum yield (PLQY) of the molecule; it can also increase the torsion angle between the electron donor and the electron acceptor, and at the same time reduce the highest occupied molecular orbital (HOMO) and The electron clouds between the lowest occupied molecular orbitals (LUMO) overlap, resulting in a small ΔEST. The organic electroluminescence device of the present invention adopts the thermally activated delayed fluorescent molecular material prepared by the present invention, and has high luminous efficiency and long service life.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a thermally activated delayed fluorescent molecular material, a synthesis method thereof, and an electroluminescence 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. In OLED, the pros and cons of the light-emitting layer material will play a decisive role in whether the OLED can be industrialized. The usual light-emitting layer material consists of host and gu...

AI Technical Summary

Problems solved by technology

The torsion angle of carbazole and acceptor A is appropriate, but the electron donating ability of carbazole is too weak; the electron donating ability of diphenylamine is moderate, but the torsion angle with acceptor A is too small; the electron donating ability of acridine is strong, but The torsion angle with the acceptor is too large

If the twist angle is large, although the RISC rate will be increased, the photoluminescence quantum efficiency (PLQY) of the material will be reduced; if the electron donating ability is too weak, the charge transfer between D and A will be poor, and the HOMO between D and A will be reduced. Too much overlap with LUMO, resulting in a large ΔEST

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