Benzochalcogenazolo-based N,O-coordinated boron difluoride complexes as gain media for organic solid-state lasers
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Benzochalcogenazolo-based N,O-coordinated boron difluoride complexes as gain media for organic solid-state lasers.pdf (2.34 MB)
0000-0001-8910-230X Date
2025
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Royal Society of Chemistry
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Abstract
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 polymer. 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 cyano group. The obtained compounds exhibit aggregation-induced emission and blue to cyan emission (455–487 nm) in solid state with photoluminescence quantum yield ranging from 21% to 85% and short excited-state lifetime of 0.80–2.27 ns. These characteristics facilitate the amplified spontaneous emission (ASE) with the progressive reduction in full width at half maximum observed across the series of benzoxazole→benzothiazole→benzoselenazole derivatives up to 15 nm, 11 nm, and 8 nm, respectively, as well as the low ASE threshold values of 18.7–40.3 μJ/cm2. The successful application of the dyes in the fabrication of organic solid-state lasers results in the laser threshold of 46.1 µJ/cm2, 28.0 µJ/cm2, and 58.6 µJ/cm2 for the devices based on benzoxazole, benzothiazole, and benzoselenazole-based boron difluoride complexes, respectively. Our work opens the pathway for the novel class of heavy atom-containing organic laser dyes, which can be used for both organic optically and electrically pumped lasers.
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R. Pytlarz, S. Kutsiy, A. Hotynchan, E. Jean-Woldemar, R. Luboradzki, P. H. Marek-Urban, G. Merklin, S. Chénais, D. Volyniuk, J. V. Grazulevicius, K. Durka, S. Forget and M. A. Potopnyk, J. Mater. Chem. C, 2025, DOI: 10.1039/D5TC02236C.