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Clustering‐Triggered Efficient Room‐Temperature Phosphorescence from Nonconventional Luminophores
Author(s) -
Zheng Shuyuan,
Hu Taiping,
Bin Xin,
Wang Yunzhong,
Yi Yuanping,
Zhang Yongming,
Yuan Wang Zhang
Publication year - 2020
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201901024
Subject(s) - phosphorescence , intersystem crossing , phosphor , luminescence , persistent luminescence , nanotechnology , chemistry , photochemistry , materials science , optoelectronics , fluorescence , atomic physics , physics , thermoluminescence , quantum mechanics , singlet state , excited state
Abstract Pure organic room‐temperature phosphorescence (RTP) and luminescence from nonconventional luminophores have gained increasing attention. However, it remains challenging to achieve efficient RTP from unorthodox luminophores, on account of the unsophisticated understanding of the emission mechanism. Herein, we propose a strategy to realize efficient RTP in nonconventional luminophores through incorporation of lone pairs together with clustering and effective electronic interactions. The former promotes spin‐orbit coupling and boosts the consequent intersystem crossing, whereas the latter narrows energy gaps and stabilizes the triplets, thus synergistically affording remarkable RTP. Experimental and theoretical results of urea and its derivatives verify the design rationale. Remarkably, RTP from thiourea solids with unprecedentedly high efficiency of up to 24.5 % is obtained. Further control experiments testify the crucial role of through‐space delocalization on the emission. These results will spur the future fabrication of nonconventional phosphors and advance the understanding of the underlying emission mechanism.