Title Bright benzindolo-benzochalcogenazolo-based N,N-coordinated difluoroboron complexes exhibiting yellow electroluminescence targeting white organic light emitting diodes
Authors Kutsiy, Stepan ; Zinchenko, Hanna M ; Kovtun, Yurii ; Sadova, Yuliia ; Hotynchan, Andrii ; Volyniuk, Dmytro ; Mech-Piskorz, Justyna ; Stakhira, Pavlo ; Angulo, Gonzalo ; Grazulevicius, Juozas V ; Potopnyk, Mykhaylo A
DOI 10.1021/acsaelm.6c00557
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Is Part of ACS Applied electronic materials.. Washington, DC : American Chemical Society. 2026, vol. 8, iss. 13, p. 5372-5383.. ISSN 2637-6113
Keywords [eng] OLED ; difluoroboron dye ; chalcogen ; selenium ; benz[c,d]indolo ; electroluminescence ; solid-state luminescence ; optoelectronics
Abstract [eng] Three benzindolo−benzochalcogenazolo-based boron difluoride complexes (bI-NNB-bCh) incorporating benzoxazole, benzothiazole, and benzoselenazole acceptor units were synthesized and studied as emissive materials for organic light-emitting diodes (OLEDs). The compounds exhibit favorable electrochemical and photophysical properties, enabling their integration into vacuum-deposited OLEDs. Devices employing a conventional OLED host produce yellow−green electroluminescence with external quantum efficiencies (EQEmax) of 3.80%. Among the investigated emitters, the benzothiazole derivative delivers the best device performance, consistently with its higher photoluminescence quantum yield of 96% in the polymeric matrix. Replacing an OLED host exhibiting thermally activated delayed fluorescence results in near-white electroluminescence, demonstrating the critical influence of host−guest interactions and excited-state environments on emission characteristics. Under these conditions, close to 25% enhancement of EQEmax was achieved for the benzothiazole-based devices emitting near-white electroluminescence with color coordinates of (0.38; 0.42). These results highlight heteroaromatic acceptor engineering within the bI-NNB-bCh framework as an effective strategy for tuning photophysical properties and OLED performance.
Published Washington, DC : American Chemical Society
Type Journal article
Language English
Publication date 2026
CC license CC license description