Modulating Tri‐Mode Emission for Single‐Component White Organic Afterglow
Jibiao Jin, Peiran Xue, Longyan Zhang, He Jiang, Wuji Wang, Qingqing Yang, Ye Tao, Chao Zheng, Runfeng Chen, Wei Huang
Abstract
Abstract Achieving single‐component white organic afterglow remains a great challenge owing to the difficulties in simultaneously supporting long‐lived emissions from varied excited states of a molecule for complementary afterglow. Here, an extraordinary tri‐mode emission from the radiative decays of singlet (S 1 ), triplet (T 1 ), and stabilized triplet (T 1 * ) excited states was proposed to afford white afterglow through modulating the singlet–triplet splitting energy (ΔE ST ) and exciton trapping depth (E TD ). Low‐lying T 1 * for yellow afterglow was constructed by H‐aggregation engineering with large E TD and trace isomer doping, while high‐lying T 1 and S 1 for blue afterglow with thermally activated emission feature were realized by reducing ΔE ST through donor–acceptor molecular design. Therefore, the single‐component white afterglow with high efficiency of 14.1 % and a lifetime of 0.61 s was achieved by rationally regulating the afterglow intensity ratios of complementary emissions from S 1 , T 1 , and T 1 *.