Dibenzothiophene-dioxide acceptor based thermally activated delayed fluorescent emitters for color tunable organic light-emitting diodes

Abstract

2,8-Bis(9,9-dimethylacridin-10(9H)-yl)dibenzo[b,d]thiophene 5,5-dioxide (AcDBTO) was developed as a dibenzothiophene-dioxide acceptor based emitter for use as a thermally activated delayed fluorescent emitter for color tunable organic light-emitting diodes. The dibenzothiophene-dioxide acceptor was modified with two strongly electron donating dimethylacridine donors, which enabled delayed fluorescence behavior in the AcDBTO emitter. The AcDBTO based device demonstrated quantum efficiency of 14.5% as a green delayed fluorescent device and wide emission wavelength from 502 nm to 525 nm with little change of the quantum efficiency.