Thermally-activated delayed fluorescent molecular materials, synthesis method thereof and electroluminescent device

Abstract

The invention provides thermally-activated delayed fluorescent molecular materials, a synthesis method thereof and an electroluminescent device. A series of nitrogen-containing sulfone-based thermally-activated delayed fluorescent molecules are synthesized. The luminescent spectra can be narrowed well due to an intramolecular multiple-resonance effect of the molecules, moreover, large rigidity ofthe molecules is exhibited due to super-large planes, and therefore the molecules have high intersystem crossing rate constants and inversely-intersystem crossing rate constants, so that reduction, caused by the energy gap rule, of a radiative transition rate is inhibited effectively, and high PLY is obtained; and meanwhile, the stability of a TADF material is increased, and the service life of the device can be improved. The structures of the molecules are confirmed through high-resolution mass spectrometry, the photophysical properties of the molecules are studied, and finally a series of high-performance deep-red-light TADF OLEDs are prepared based on the luminescent materials.

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 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. 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 gue...

AI Technical Summary

Problems solved by technology

However, at present, the half-maximum width (FWHM) of TADF materials is relatively wide, which is not conducive to the improvement of the efficiency of top-emitting devices.

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