Cocrystals Strategy towards Materials for Near‐Infrared Photothermal Conversion and Imaging |
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| Authors: | Yu Wang Dr. Weigang Zhu Dr. Wenna Du Prof. Xinfeng Liu Dr. Xiaotao Zhang Prof. Huanli Dong Prof. Wenping Hu |
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| Affiliation: | 1. Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University & Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, China;2. Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Science (ICCAS), Beijing, China;3. Division of Nanophotonics, CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, China |
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| Abstract: | A cocrystal strategy with a simple preparation process is developed to prepare novel materials for near‐infrared photothermal (PT) conversion and imaging. DBTTF and TCNB are selected as electron donor (D) and electron acceptor (A) to self‐assemble into new cocrystals through non‐covalent interactions. The strong D–A interaction leads to a narrow band gap with NIR absorption and that both the ground state and lowest‐lying excited state are charge transfer states. Under the NIR laser illumination, the temperature of the cocrystal sharply increases in a short time with high PT conversion efficiency (η=18.8 %), which is due to the active non‐radiative pathways and inhibition of radiative transition process, as revealed by femtosecond transient absorption spectroscopy. This is the first PT conversion cocrystal, which not only provides insights for the development of novel PT materials, but also paves the way of designing functional materials with appealing applications. |
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| Keywords: | charge transfer cocrystals near-IR absorption photothermal conversion photothermal imaging |
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