Benzochalcogenazolo-based N,O-coordinated boron difluoride complexes as gain media for organic solid-state lasers

Radosław Pytlarz; Stepan Kutsiy; Andrii Hotynchan; Enzo Jean-Woldemar; Roman Luboradzki; Paulina H Marek-Urban; Georg Merklin; Sébastien Chénais; Dmytro Volyniuk; Juozas V Grazulevicius; Krzysztof Durka; Sébastien Forget; Mykhaylo A Potopnyk

doi:10.1039/d5tc02236c

Title	Benzochalcogenazolo-based N,O-coordinated boron difluoride complexes as gain media for organic solid-state lasers
Authors	Pytlarz, Radosław ; Kutsiy, Stepan ; Hotynchan, Andrii ; Jean-Woldemar, Enzo ; Luboradzki, Roman ; Marek-Urban, Paulina H ; Merklin, Georg ; Chénais, Sébastien ; Volyniuk, Dmytro ; Grazulevicius, Juozas V ; Durka, Krzysztof ; Forget, Sébastien ; Potopnyk, Mykhaylo A
DOI	10.1039/d5tc02236c
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Is Part of	Journal of materials chemistry C.. Cambridge : Royal Society of Chemistry. 2025, vol. 13, iss. 32, p. 16478-16488.. ISSN 2050-7526. eISSN 2050-7534
Abstract [eng]	Three N,O-coordinated benzochalcogenazolo-based boron difluoride complexes have been designed, synthesized, and spectroscopically characterized using their solutions, solid state, and the films of dye-doped polymers. The structural analysis demonstrated that dyes adopt twisted molecular structures with the torsion angle ranging from 24° to 37°, attributed to the steric effect of the cyano group. The obtained compounds exhibit aggregation-induced emission and blue to cyan emission (455-487 nm) in the solid state with a photoluminescence quantum yield ranging from 21% to 85% and a short excited-state lifetime of 0.80-2.27 ns. These characteristics facilitate the amplified spontaneous emission (ASE) with the progressive reduction in the full width at half maximum observed across the series of benzoxazole → benzothiazole → benzoselenazole derivatives up to 15 nm, 11 nm, and 8 nm, respectively, and also the low ASE threshold values of 18.7-40.3 μJ cm−2. The successful application of the dyes in the fabrication of organic solid-state lasers results in a laser threshold of 46.1 μJ cm−2, 28.0 μJ cm−2, and 58.6 μJ cm−2 for the devices based on benzoxazole, benzothiazole, and benzoselenazole-based boron difluoride complexes, respectively. Our work opens the pathway for a novel class of heavy atom-containing organic laser dyes, which can be used for both organic optically and electrically pumped lasers.
Published	Cambridge : Royal Society of Chemistry
Type	Journal article
Language	English
Publication date	2025
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„Benzochalcogenazolo-based N,O-coordinated boron difluoride complexes as gain media for organic solid-state lasers“