Thermally activated delayed fluorescence molecular material, synthesis method thereof, and electroluminescent device

Abstract

The invention provides a thermally activated delayed fluorescence molecular material, a synthesis method thereof, and an electroluminescent device. Through synthesizing a thermally activated delayed fluorescence molecule containing a indolobenzo selenium-heteroaromatic aromatic ring donor, the electron donating ability of the donor is enhanced, and the rate of nonradiative jump can be effectivelyinhibited, thus increasing the luminescence quantum yield (PLQY) of the molecule, and increasing the torsion angle between the electron donor and an electron acceptor while reducing electron cloud overlap between the highest occupied molecular orbit (HOMO) and the lowest occupied molecular orbit (LUMO), resulting in a smaller [delta]EST. The electroluminescent device adopts the thermally activateddelayed fluorescence molecular material, and has a high luminous efficiency and long service lifetime.

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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