Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 30, Issue 13, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201907282
Keywords
aqueous solution; micelle-assisted self-assembly; nanocrystal; pure organic compounds; room temperature phosphorescence
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Funding
- Ministry of Science and Technology of China [2017YFA0206903]
- National Natural Science Foundation of China [21871280, 21861132004]
- 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
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Pure organic room temperature phosphorescence (RTP) is highly preferable because of its long lifetime and potential applications. However, these kinds of materials are still very scarce due to the weak spin-orbit coupling between singlet and triplet states and easily nonradiative decay of the excited states. Achieving room temperature phosphorescence under visible light excitation is particularly challenging in aqueous solution. Herein, a micelle-assisted assembling strategy has been developed to realize pure organic RTP in water by using donor-acceptor molecules. A visible-light responsive long-lived RTP in water with a lifetime more than 3 ms is obtained by the prepared nanocrystals. However, the same molecules show no RTP as rigid bulk crystals. Spectroscopic studies, single-crystal structure analysis, X-ray diffraction patterns, and density functional theory calculations reveal that the intermolecular interactions, heavy atom effect, and the molecular packing way play critical role to the long-lived RTP character for the assembled nanocrystals in water and thermally activated delayed fluorescence for crystals in solid.
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