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Updated: Aug 18, 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 sterically hindered asymmetric D-A-D' thermally activated delayed fluorescence emitter for highly efficient
Zhan Yang1, Zhu Mao1, Chao Xu2
1PCFM Lab , GDHPPC Lab , Guangdong Engineering Technology , Research Center for High-performance Organic and Polymer Photo-electric, Functional Films , State Key Laboratory of OEMT , School of Chemistry , Sun Yat-Sen University , Guangzhou 510275 , China . Email: zhaoj95@mail.sysu.edu.cn ; Email: ceszy@mail.sysu.edu.cn ;
Abstract:
Thermally activated delayed fluorescence (TADF) materials have opened a new chapter for high-efficiency and low-cost organic light-emitting diodes (OLEDs). Herein, we describe a novel and effective design strategy for TADF emitters which includes introducing a carbazole donor unit at the ortho-position, at which the donor and acceptor groups are spatially in close proximity to guarantee the existence of intramolecular electrostatic attraction and through-space charge transfer, leading to reduced structural vibrations, suppressed non-radiative decay and rapid radiative decay to avoid excited state energy loss. As a result, a green TADF emitter (2Cz-DPS) showing high solid-state photoluminescence quantum efficiency (91.9%) and excellent OLED performance was produced. Theoretical simulations reveal that the non-adiabatic coupling accelerates the reverse intersystem crossing of 2Cz-DPS, resulting in a state-of-the-art non-doped OLED with an extremely high external quantum efficiency of 28.7%.
