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While open-shell luminophores with doublet spin properties are considered highly promising for next generation organic-light emitting devices, most radicals are associated with poor photostability and photoluminescence quantum yield (PLQYs). We establish certain structure-performance interrelations to improve the optical properties of radicals specifically. Two series of trityl radicals functionalized with one to three 2,7-disubstituted carbazole units are studied, carrying either nitriles or bromines as substituents. The electron-withdrawing substituents in 2,7-position induce a blue-shift of emission and exceptional PLQYs up to 87 %. Quantum mechanical calculations further elucidate the electronic and steric properties of the molecules responsible for the outstanding optical performance.
Lisa Chen,Mona Arnold,Yonca Kittel,Rémi Blinder,Fedor Jelezko, andAlexander J. C. Kuehne
"2,7-substituted N-carbazole donors on tris (2,4,6-trichlorophenyl) methyl radicals with high quantum yield", Proc. SPIE PC12208, Organic and Hybrid Light Emitting Materials and Devices XXVI, PC122081E (26 September 2022); https://doi.org/10.1117/12.2641779
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Lisa Chen, Mona Arnold, Yonca Kittel, Rémi Blinder, Fedor Jelezko, Alexander J. C. Kuehne, "2,7-substituted N-carbazole donors on tris (2,4,6-trichlorophenyl) methyl radicals with high quantum yield," Proc. SPIE PC12208, Organic and Hybrid Light Emitting Materials and Devices XXVI, PC122081E (26 September 2022); https://doi.org/10.1117/12.2641779