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Updated: Apr 29, 2026

Scale-up Chemical Synthesis of Thermally-activated Delayed Fluorescence Emitters Based on the Dibenzothiophene-S,S-Dioxide Core
Published on: October 24, 2017
Blue-Emitting N,O-Coordinated Boron Difluoride Complexes with Benzochalcogenazole-Containing Donor-Acceptor
Hanna Zinchenko1,2, Enzo Jean-Woldemar3, Andrii Hotynchan2
1Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland.
Abstract:
Six novel N,O-coordinated benzochalcogenazole-based boron difluoride complexes (1a,b-3a,b) have been synthesized and spectroscopically characterized. The influence of the chalcogen atom (O, S, Se) in the benzochalcogenazole unit on the photophysical properties was systematically investigated. Although the complexes exhibit negligible fluorescence in solution, they display aggregation-induced emission and intense solid-state luminescence, achieving photoluminescence quantum yields of up to 85% in the crystalline state and 69% in poly(methyl methacrylate) films. The benzoxazole- and benzothiazole-based derivatives exhibit blue amplified spontaneous emission with maxima in the range of 429-455 nm (λex = 337 nm), thresholds as low as 12.4 μJ/cm2, and full widths at half-maximum as narrow as 9.5 nm. These compounds also display both prompt and delayed fluorescence, indicating efficient exciton utilization. The results demonstrate that rational chalcogen substitution effectively modulates the emission behavior, providing valuable design principles for next-generation organic photonic and optoelectronic materials.
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