2,7-substituted N-carbazole donors on tris (2,4,6-trichlorophenyl) methyl radicals with high quantum yield

Lisa Chen; Mona Arnold; Yonca Kittel; Rémi Blinder; Fedor Jelezko; Alexander J. C. Kuehne

doi:10.1117/12.2641779

26 September 2022 2,7-substituted N-carbazole donors on tris (2,4,6-trichlorophenyl) methyl radicals with high quantum yield

Lisa Chen, Mona Arnold, Yonca Kittel, Rémi Blinder, Fedor Jelezko, Alexander J. C. Kuehne

Author Affiliations +

Proceedings Volume PC12208, Organic and Hybrid Light Emitting Materials and Devices XXVI; PC122081E (2022) https://doi.org/10.1117/12.2641779
Event: SPIE Organic Photonics + Electronics, 2022, San Diego, California, United States

Conference Poster

Abstract

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.

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Lisa Chen, Mona Arnold, Yonca Kittel, Rémi Blinder, Fedor Jelezko, and 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

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