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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