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, and suppress molecular motion. Consequently, it promotes intersystem crossing and triplet radiative transition while inhibiting nonradiative transition, thereby efficiently enhancing RTP emission. A proof-of-concept acceptor-dendronized dendrimer exhibits long phosphorescence lifetimes in the millisecond range in ambient solution and near 100% photoluminescent quantum yields in the doped films. This is the first reported RTP dendrimer to date. An OLED fabricated using this dendrimer in a sky-blue emission achieves an external quantum efficiency of 25.1%, which represents the state-of-the-art efficiency based on solution-processed RTP-OLEDs to date. Our findings offer definitive guidelines for the molecular engineering of RTP materials and pave the way for innovative RTP systems in diverse optoelectronic applications.
Li et al. (2025) studied this question.