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Updated: Feb 13, 2026

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
Published on: October 24, 2017
A Methodological Study on Tuning the Thermally Activated Delayed Fluorescent Performance by Molecular Constitution in
Rongjuan Yang1, Qian Guan1, Zhiyang Liu1
1Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, P.R. China.
Abstract:
Thermally activated delayed fluorescent (TADF) emitters are usually designed as donor-acceptor structures with large dihedral angles, which tend to incur low fluorescent efficiency, and therefore, through molecular design various strategies have been proposed to increase the efficiency of emitters; however, few studies have compared these strategies in one TADF system. In this study, a novel TADF molecule, [4-(9,9-diphenylacridin-10-yl)phenyl](phenyl)methanone (BP-DPAC), was designed as a prototype, and two derivatives, BP-Ph-DPAC and DPAC-BP-DPAC, were also prepared to represent two common approaches to enhance TADF performance. Compared with the maximum external quantum efficiency (EQE) of 6.82 % for BP-DPAC, organic light-emitting diodes (OLED) devices based on DPAC-BP-DPAC exhibited enhanced TADF properties with the highest maximum EQE of 18.67 %, owing to an additional diphenylacridine donor, whereas BP-Ph-DPAC showed non-TADF properties and exhibited the lowest EQE of 4.25 %, owing to the insertion of a phenyl ring between donor and acceptor.
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