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A phosphanthrene oxide host, 5,10‐diphenyl‐phosphanthrene 5,10‐dioxide (DPDPO2A), with intra‐ and intermolecular hydrogen bonds achieves spheroidal cis‐configuration and close sphere packing. DPDPO2A realizes effective exciton suppression and excellent and balanced carrier transporting ability, both at the same time, demonstrating favorable photoluminescence quantum yield of 84% from its blue thermally...
Highly efficient low‐voltage‐driven true‐blue thermally activated delayed fluorescence diodes are realized through employing a tri‐phosphine oxide host (2,2′,4‐tris(di(phenyl) phosphoryl)‐diphenylether (DPETPO)) with a record external quantum efficiency of 23.0% and the lowest onset voltage of 2.8 V to date.
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