期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 141, 期 12, 页码 5045-5050出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.9b00859
关键词
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资金
- Ministry of Science and Technology of China [2017YFA0206903]
- National Natural Science Foundation of China [21871280, 21861132004, 21525206]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17000000]
- Key Research Program of Frontier Sciences of the Chinese Academy of Sciences [QYZDY-SSW-JSC029]
- K. C. Wong Education Foundation
Pure organic room temperature phosphorescence (RTP) has unique advantages and various potential applications. However, it is challengeable to achieve organic RTP under visible and near-infrared (NIR)-light excitation, especially in aqueous solution. Herein we assemble difluoroboron beta-diketonate compounds to form organic nanoparticles (NPs) in water. The resulting NPs are able to show efficient RTP, effective uptake, and bright imaging of HeLa cells under both visible- and NIR-light excitation. More strikingly, spectroscopic study, single-crystal X-ray diffraction, and DFT calculation reveal that the efficient RTP in organic NPs is originated from dimers in their excited states. The multiple interactions and intermolecular charge transfer in the dimer structures are of significance in promoting the production of dimer triplet excited states and suppressing the nonradiative decays to boost the RTP under visible- and NIR-light irradiation in water.
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