Photocured room temperature phosphorescent materials from lignosulfonate

Hongda Guo, Mengnan Cao, Ruixia Liu, Bing Tian, Shouxin Liu, Jian Li, Shujun Li, Bernd Strehmel, Tony D. James () and Zhijun Chen ()
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Hongda Guo: Northeast Forestry University, Ministry of Education
Mengnan Cao: Northeast Forestry University, Ministry of Education
Ruixia Liu: Northeast Forestry University, Ministry of Education
Bing Tian: Northeast Forestry University, Ministry of Education
Shouxin Liu: Northeast Forestry University, Ministry of Education
Jian Li: Northeast Forestry University, Ministry of Education
Shujun Li: Northeast Forestry University, Ministry of Education
Bernd Strehmel: Niederrhein University of Applied Sciences
Tony D. James: University of Bath
Zhijun Chen: Northeast Forestry University, Ministry of Education

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Photocured room temperature phosphorescent (RTP) materials hold great potential for practical applications but are scarcely reported. Here, we develop photocured RTP materials (P-Lig) using a combination of lignosulfonate, acrylamide, and ionic liquid (1-ethyl-3-methylimidazolium bromide). With this design, lignosulfonate simultaneously serves as RTP chromophore and photoinitiator. Specifically, lignosulfonate in the ionic liquid generates radicals to polymerize the acrylamide upon UV irradiation. The resulting lignosulfonate is automatically confined in an as-formed crosslinked matrix to provide RTP. As such RTP with an emission lifetime of ~110 ms is observed from the confined lignosulfonate in P-Lig. Additionally, energy transfer occur between P-Lig and Rhodamine B (RhB), triggering red afterglow emission when P-Lig is in situ loaded with RhB (P-Lig/RhB). As a demonstration of potential applications, the P-Lig and P-Lig/RhB are used as photocured RTP coatings and RTP inks for fabricating 3D materials and for information encryption.

Date: 2024
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DOI: 10.1038/s41467-024-45622-3

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