Stepwise taming of triplet excitons via multiple confinements in intrinsic polymers for long-lived room-temperature phosphorescence

Liang Gao, Jiayue Huang, Lunjun Qu, Xiaohong Chen, Ying Zhu, Chen Li, Quanchi Tian, Yanli Zhao () and Chaolong Yang ()
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Liang Gao: Chongqing University of Technology
Jiayue Huang: Chongqing University of Technology
Lunjun Qu: Chongqing University of Technology
Xiaohong Chen: Chongqing University of Technology
Ying Zhu: Chongqing University of Technology
Chen Li: Chongqing University of Technology
Quanchi Tian: Chongqing University of Technology
Yanli Zhao: Nanyang Technological University
Chaolong Yang: Chongqing University of Technology

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Polymeric materials exhibiting room temperature phosphorescence (RTP) show a promising application potential. However, the conventional ways of preparing such materials are mainly focused on doping, which may suffer from phase separation, poor compatibility, and lack of effective methods to promote intersystem crossing and suppress the nonradiative deactivation rates. Herein, we present an intrinsically polymeric RTP system producing long-lived phosphorescence, high quantum yields and multiple colors by stepwise structural confinement to tame triplet excitons. In this strategy, the performance of the materials is improved in two aspects simultaneously: the phosphorescence lifetime of one polymer (9VA-B) increased more than 4 orders of magnitude, and the maximum phosphorescence quantum yield reached 16.04% in halogen-free polymers. Moreover, crack detection is realized by penetrating steam through the materials exposed to humid surroundings as a special quenching effect, and the information storage is carried out by employing the Morse code and the variations in lifetimes. This study provides a different strategy for constructing intrinsically polymeric RTP materials toward targeted applications.

Date: 2023
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DOI: 10.1038/s41467-023-43133-1

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