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Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
Published on: October 24, 2017
Suppression of Nonradiative Decay in TADF Emitters via a Macrocyclic Strategy: An Experimental Study
Xin Xie1,2, Teng Gao1,2, Shaogang Shen1,2
1Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
Abstract:
To experimentally investigate the impact of macrocyclic structures on the nonradiative decay rate constants (knrs) of thermally activated delayed fluorescence (TADF), a macrocyclic molecule L-ring and its analogue NL-ring were designed and synthesized. The photophysical measurements reveal their TADF characteristics, and the knrs of the L-ring (4.19 × 106 s-1) is slower than that of the NL-ring (1.96 × 107 s-1), endowing the L-ring with a photoluminescence quantum yield of 92.00%. Therefore, the L-ring device exhibited a high external quantum efficiency of 25.61%.
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