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Updated: Jan 10, 2026

Time-resolved Photophysical Characterization of Triplet-harvesting Organic Compounds at an Oxygen-free Environment Using an iCCD Camera
Published on: December 27, 2018
Observation of thermally activated intersystem crossing in room-temperature phosphorescence of weakly
Wenbin Huang1, Chenlong Wei2, Yuxin Zhu2
1School of Materials Science and Engineering, Harbin Institute of Technology Shenzhen Shenzhen Guangdong 518055 China zhangqf@hit.edu.cn hezikai@hit.edu.cn.
Abstract:
The direct observation of thermally activated intersystem crossing (TA-ISC) processes in room-temperature phosphorescence (RTP) has not been well investigated. Here, we reported four weakly donor-acceptor-donor π-ternary molecules featuring isomerism-dependent phosphorescence behaviors. The isomerism was modulated by changing the substitution position, offering tunable molecular planarity and π-conjugation. As a result, regulated energy levels and orbital configurations of the excited states facilitate additional TA-ISC channels as revealed by theoretical investigations. The temperature-dependent photoluminescence and fs- and ns-transient absorption spectra undoubtedly demonstrate their existence and effectiveness in promoting efficient and persistent RTP. The ISC rate constant achieves a breakthrough value of up to 1.93 × 109 s-1 within a poly(vinyl alcohol) matrix film, surpassing that in many existing afterglow systems containing heavy or hetero atoms. Abundant triplet excitons are populated and enable remarkable room-temperature phosphorescence performance, facilitating potential applications in constructing thermosensitive glasses and anti-counterfeiting patterns. This study offers a practical mechanism for developing novel RTP materials.
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