As for the thermally activated delayed fluorescence materials, a high reaction rate constant of reverse intersystem enthalpy constant (k_RISC) and a high photoluminescence quantum yield (PLQY) are necessary for fabricating OLED display devices having high luminescent efficiency. Currently, the thermally activated delayed fluorescence materials with the above features are still relatively lacking as compared with heavy metal complexes.

A novel deep blue thermally activated delayed fluorescent material having high thermal stability and a high ratio of thermally activated delayed fluorescent materials to photoluminescence quantum yield to solve the problems in the prior art.

A thermally activated delayed fluorescent material includes a structural formula (I) as follows:

and D1 and D2 are different electron donors.

In one embodiment, the D1 includes one of following chemical structural formulas:

and R1 is selected one from an oxygen or a C1-C3 alkyl group;

and the R2 selected one from a C1-C3 alkyl or a silane group;