| abstract |
The invention provides an improved heat-activated delayed fluorescent material, a preparation method and a fluorescent device. The electron donor and the electron acceptor in the fluorescent material are connected through a dibenzo eight-membered ring, and replaced by an electron-withdrawing group F and a cyano group. , and then connect different electron-donating units, synthesized a series of blue-light thermally activated delayed fluorescent materials with lower single-triplet energy level difference, high luminous efficiency, and fast reverse intersystem crossing constant, and realized the electron-donating unit at the same time The fine-tuning of the structure enables the fine-tuning of the spectrum to realize the synthesis of ultrafast reverse intersystem crossing rate, high luminous efficiency TADF material and its application in light-emitting devices. |