Efficient thermally activated delayed fluorescent emitter based on a spiro-type benzo[b]acridine donor and a benzophenone acceptor

A novel spiro-type donor 5 H -spiro[benzo[ b ]acridine-12,9′-fluorene] and a thermally activated delayed fluorescence emitter bis(4-(5 H -spiro[benzo[ b ]acridine-12,9′-fluoren]-5-yl)phenyl)methanone were synthesized for a high efficiency organic light-emitting diode.