Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 28, Pages 15490-15496Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202103200
Keywords
fluorescence; hydrothermal synthesis; nanomaterials; room-temperature phosphorescence; silica
Categories
Funding
- National Natural Science Foundation of China [21825402, 22074101]
- Natural Science Foundation of Jiangsu Province of China [BK20191417, BK20200851]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project
- Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC)
- Program for Jiangsu Specially-Appointed Professors
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Zinc-doped silica nanospheres prepared using a hydrothermal synthetic strategy exhibit stable fluorescence and long-lived room-temperature phosphorescence properties, with high water solubility and excellent stability.
Fluorescence and phosphorescence are known as two kinds of fundamental optical signals, which have been used for myriad applications. To date, simultaneous activation of stable fluorescence and long-lived room-temperature phosphorescence (RTP) emission in the aqueous phase remains a big challenge. We prepare zinc-doped silica nanospheres (Zn@SiNSs) with fluorescence and RTP properties using a facile hydrothermal synthetic strategy. For the as-prepared Zn@SiNSs, the recombination of electrons and holes in defects and defect-stabilized excitons derived from oxygen vacancy/C=N bonds lead to the production of stable fluorescence and long-lived RTP (emission lasting for approximate to 9 s, quantum yield (QY): approximate to 33.6 %, RTP lifetime: approximate to 236 ms). The internal Si-O bonded networks and hydrophilic surface in Zn@SiNSs can reduce nonradiative decay to form self-protective RTP, and also provide high water solubility, excellent pH- and photostability.
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