ArticleChemical science2026
Simultaneous enhancement of photoluminescence efficiency and photostability in diphenylpyridylmethyl radicals by pentaphenylphenyl substitution.
Article in Chemical science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Sterically demanding substituents on phenyl donor groups are required to enhance the photoluminescence efficiency of weakly emissive diphenylpyridylmethyl stable radicals by suppressing non-radiative decay. However, the resulting reduction in π-conjugation compromises photostability, leading to a trade-off between photoluminescence quantum yield (PLQY) and photostability in these systems. Here, we report pentaphenylphenyl-substituted diphenylpyridylmethyl radicals that simultaneously exhibit PLQYs exceeding 60% and photostabilities approximately 500 times greater than that of tris(2,4,6-trichlorophenyl)methyl (TTM) radical. Furthermore, peripheral methyl substitution modulates molecular polarity and alters the solvent dependence of the emission properties. Theoretical analyses reveal that pentaphenylphenyl substitution improves emission efficiency by increasing the transition dipole moment and suppressing vibronic coupling at the D
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