Thermally activated delayed fluorescent material, organic electroluminescent device and display device

The embodiment of the invention provides a thermally activated delayed fluorescent material, an organic electroluminescent device and a display device. The TADF material has the following general formula (1), a molecular structure composed of X1, X2 and M1-M8 in the general formula (1) is a receptor, and X1 comprises any one of carbonyl, sulfuryl and boron atoms; at least one of M3 and M4 is not CH, and at least one of M6 and M7 is not CH; when X2 is not bonded, M1 to M8 independently comprise a nitrogen atom or CR1, and R1 is a hydrogen atom or a C1-C12 alkyl group; when X2 is bonded, M1, M3, M4, M5, M6 and M7 respectively and independently comprise a nitrogen atom or CR2, R2 is a hydrogen atom or a C1-C12 alkyl group, and M2 and M8 are both carbon atoms; a1 and A2 are donors and are the same. According to the embodiment of the invention, the TADF material has a distorted and rigid donor-acceptor-donor structure, and the luminous efficiency and the luminous purity of the organic electroluminescent device con