Photoactivated room temperature phosphorescence from lignin

Jingyi Zhou, Bing Tian, Yingxiang Zhai, Min Wang, Shouxin Liu, Jian Li, Shujun Li, Tony D. James () and Zhijun Chen ()
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Jingyi Zhou: Ministry of Education
Bing Tian: Ministry of Education
Yingxiang Zhai: Ministry of Education
Min Wang: Ministry of Education
Shouxin Liu: Ministry of Education
Jian Li: Ministry of Education
Shujun Li: Ministry of Education
Tony D. James: University of Bath
Zhijun Chen: Ministry of Education

Nature Communications, 2024, vol. 15, issue 1, 1-7

Abstract: Abstract Sustainable photoactivated room temperature phosphorescent materials exhibit great potential but are difficult to obtain. Here, we develop photoactivated room temperature phosphorescent materials by covalently attaching lignin to polylactic acid, where lignin and polylactic acid are the chromophore and matrix, respectively. Initially the phosphorescence of the lignin is quenched by residual O2. However, the phosphorescence is switched on when the residual oxygen is consumed by the triplet excitons of lignin under continuous UV light irradiation. As such, the lifetime increases from 3.0 ms to 221.1 ms after 20 s of UV activation. Interestingly, the phosphorescence is quenched again after being kept under an atmosphere of air for 2 h in the absence of UV irradiation due to the diffusion of oxygen into the materials. Using these properties, as-developed material is successfully used as a smart anti-counterfeiting logo for a medicine bottle and for information recording.

Date: 2024
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DOI: 10.1038/s41467-024-51545-w

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