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Title: Cross-linked polyphosphazene nanospheres boosting long-lived organic room-temperature phosphorescence
Authors: Zhang, Yongfeng
Chen, Xiaohong
Xu, Jianrong
Zhang, Qinglun
Gao, Liang
Wang, Zhonghao
Qu, Lunjun
Wang, Kaiti
Li, Youbing
Cai, Zhengxu
Zhao, Yanli
Yang, Chaolong
Keywords: Science::Chemistry
Issue Date: 2022
Source: Zhang, Y., Chen, X., Xu, J., Zhang, Q., Gao, L., Wang, Z., Qu, L., Wang, K., Li, Y., Cai, Z., Zhao, Y. & Yang, C. (2022). Cross-linked polyphosphazene nanospheres boosting long-lived organic room-temperature phosphorescence. Journal of the American Chemical Society, 144(13), 6107-6117.
Project: RG3/21
Journal: Journal of the American Chemical Society
Abstract: Long-lived organic room-temperature phosphorescence (RTP) has sparked intense explorations, owing to the outstanding optical performance and exceptional applications. Because triplet excitons in organic RTP experience multifarious relaxation processes resulting from their high sensitivity, spin multiplicity, inevitable nonradiative decay, and external quenchers, boosting RTP performance by the modulated triplet-exciton behavior is challenging. Herein, we report that cross-linked polyphosphazene nanospheres can effectively promote long-lived organic RTP. Through molecular engineering, multiple carbonyl groups (C═O), heteroatoms (N and P), and heavy atoms (Cl) are introduced into the polyphosphazene nanospheres, largely strengthening the spin-orbit coupling constant by recalibrating the electronic configurations between singlet (Sn) and triplet (Tn) excitons. In order to further suppress nonradiative decay and avoid quenching under ambient conditions, polyphosphazene nanospheres are encapsulated with poly(vinyl alcohol) matrix, thus synchronously prompting phosphorescence lifetime (173 ms longer), phosphorescence efficiency (∼12-fold higher), afterglow duration time (more than 20 s), and afterglow absolute luminance (∼19-fold higher) as compared with the 2,3,6,7,10,11-hexahydroxytriphenylene precursor. By measuring the emission intensity of the phosphorescence, an effective probe based on the nanospheres is developed for visible, quantitative, and expeditious detection of volatile organic compounds. More significantly, the obtained films show high selectivity and robustness for anisole detection (7.1 × 10-4 mol L-1). This work not only demonstrates a way toward boosting the efficiency of RTP materials but also provides a new avenue to apply RTP materials in feasible detection applications.
ISSN: 0002-7863
DOI: 10.1021/jacs.2c02076
Schools: School of Physical and Mathematical Sciences 
Rights: © 2022 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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