Delayed fluorescence material for organic electroluminescence device

A delayed fluorescence material with a general formula (1) as follows:

• wherein W independently represents an oxygen atom, a sulfur atom or a selenium atom;
• R1, R2 and R3 are independently selected from the group consisting of a hydrogen atom, a deuterium atom, a halide, formula (2) or formula (3):
• D is an electron donor represented from formula (1), a substituted or unsubstituted carbazolyl group, a substituted or unsubstituted biscarbazolyl group, a substituted or unsubstituted dihydroacridine group, a substituted or unsubstituted phenoxazine group and a substituted or unsubstituted diarylamine group;
• A is an electron acceptor selected from the group consisting of the following formulas:
• L represents a single bond or a substituted or unsubstituted divalent arylene group having 6 to 30 ring carbon atoms, p represents an integer of 0 to 4, q represents an integer of 0 to 5, r represents an integer of 1 to 4, Y1 to Y4 is a divalent bridge selected from the atom or group consisting from O, S, C(R22)(R23), NR24, and Si(R25)(R26), X1 to X7 represent a nitrogen atom or C(Rs), and each Rs represents a hydrogen, a phenyl, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, or a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, Z represents a cyano group or a fluorine atom, R4 to R26 are independently selected from the group consisting of a hydrogen atom, a halide, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted aryl group having 6 to 30 carbon atoms, and a substituted or unsubstituted aralkyl group having 6 to 30 carbon atoms.