| abstract |
The invention belongs to the technical field of preparation and application of organic photoelectric materials, and in particular relates to a luminescent material with thermally induced delayed fluorescence, its application and an electroluminescent device. The luminescent material with thermally induced delayed fluorescence provided by the present invention uses carbazole derivatives as donor groups to achieve a smaller singlet triplet energy gap through molecular twisting, thereby realizing the transition from triplet excitons to singlet excitons. Reverse intersystem jumping improves exciton utilization and improves device efficiency. Using the luminescent material with thermally induced delayed fluorescence provided by the present invention as the host luminescent material can reduce the efficiency roll-off of the device, and as the guest luminescent material, the luminescent layer has high brightness, good stability, high luminous efficiency and long service life . Using the luminescent material with thermally induced delayed fluorescence provided by the invention as the organic luminescent medium, the efficiency of the device is reduced, the luminous efficiency is high, and the service life is long. |