Achieving Efficient Organic Room-Temperature Phosphorescence through Acceptor Dendronization

作者：Chensen Li, Zhenchen Lou, Minghui Wu, Fulong Ma, Xinmeng Chen, Haozhe Tan, Zonghang Liu, Feng Gao, Zijie Qiu, Zheng Qing Zhao, Lianrui Hu, Guohua Xie, Maoqiu Li, Yumeng Guo, Zhongjie Ren, Song Zhang, Yuchao Liu, Shouke Yan, Zhen Li, Bo Xu, Ryan T. K. Kwok, Jacky W. Y. Lam, Ben Zhong Tang · 发表于：Journal of the American Chemical Society · 年份：2025 · DOI：10.1021/jacs.5c06288 · 被引用次数：58 · 研究领域：Luminescence and Fluorescent Materials、Organic Light-Emitting Diodes Research、Advanced biosensing and bioanalysis techniques

Organic room-temperature phosphorescence (RTP) materials hold significant promise for applications in optoelectronics, information security, and bioimaging. Recently, significant progress has been made in RTP materials and vacuum deposited organic light-emitting diode (OLED) devices. However, the performance of solution-processed OLEDs is seriously lagging be-hind, due to the lack of RTP molecular strategies that balance exciton stability and solution processability at the single-molecule scale. In this work, we propose an acceptor dendronization strategy for designing RTP materials, successfully achieving highly efficient and stable RTP emissions. This strategy can simultaneously enhance the various processes involved in RTP emission at the single-molecule level: increase the intersystem crossing channels, enhance the spin-orbit coupling con-stants between T1 and S0, and suppress molecular motion. Consequently, it promotes intersystem crossing and triplet radia-tive transition while inhibiting non-radiative transition, thereby efficiently enhancing RTP emission. A proof-of-concept ac-ceptor-dendronized dendrimer exhibits long phosphorescence lifetimes in the milliseconds 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 represent the state-of-the-art efficiency based ...