科研之友
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摘要
A universal thermally activated delayed beta uorescence (TADF) host, 4'-diphenyl phosphinoylspiro[fluorene-9,9'-xanthene] (SFXSPO), is constructed with a highly distorted and asymmetric configuration and disordered molecular packing in its solid state. SFXSPO successfully endows its full-color TADF diodes with state-of-the-art performance, e.g., the record external quantum efficiency of 22.5% and 19.1% and internal quantum efficiency of approximate to 100% for its yellow TADF diodes and single-host full-TADF nearly-white-emitting devices, respectively.
