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

Abstract

The invention provides a thermally activated delayed fluorescent molecular material and a synthesis method thereof, and an organic electroluminescent device. The thermally activated delayed fluorescent molecular material comprises an electron donor and an electron acceptor, wherein the electron acceptor contains an indenyl. By substituting the phenyl in diphenylamine or triphenylamine in a donor molecule with indenyl, the electron donating ability of the donor can be increased, and the non-radiative transition rate can be effectively suppressed, thereby increasing the molecular photoluminescence quantum yield (PLQY), also increasing the torsion angle between the electron donor and the electron acceptor, at the same time reducing the electron cloud overlapping between a highest occupied molecular orbital (HOMO) and a lowest unoccupied molecular orbital (LUMO), and accordingly acquiring small delta EST.

Description

technical field [0001] The invention relates to the technical field of organic photoelectric materials, in particular to a heat-activated delayed fluorescence single-molecule white light material, a synthesis method thereof, and an organic 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-em...

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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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