Journal
DALTON TRANSACTIONS
Volume 45, Issue 6, Pages 2686-2693Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5dt04279h
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Funding
- National Natural Science Foundation of China [21371165, 51372242, 21221061, 91122030, 21210001, 21501167]
- Science and Technology Cooperation Special Project of Hong Kong [2014DFT10310]
- Science and Technology Cooperation Special Project of Macao [2014DFT10310]
- Science and Technology Cooperation Special Project of Taiwan [2014DFT10310]
- National Key Basic Research Program of China [2014CB643802]
- Youth Innovation Promotion Association of Chinese Academy of Sciences [2015181]
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Water-soluble lanthanide (Ln(3+)) doped Bi2O3 nanospheres have been successfully prepared through a solid-state-chemistry thermal decomposition process. The nanospheres exhibit intense upconversion luminescence (UCL) by doping the Ln(3+) (Ln = Yb, Er/Ho/Tm) ions into the Bi2O3 host matrix under 980 nm excitation. The ratio of red/green emission of Bi2O3:Yb3+/Er3+ nanospheres exhibits a significant change as the calcination temperature increases and the value could reach 105.6. Moreover, the UCL of Bi2O3:Yb3+/Tm3+ nanospheres are temperature-sensitive, where the intensity ratios of 799 and 808 nm emissions increase monotonously with temperature. The MTT assay reveals that Bi2O3:Yb3+/Tm3+ nanospheres exhibit good biocompatibility by grafting citric acid molecules on the surface. The application possibility of Bi2O3:Yb3+/Tm3+ nanospheres as bioprobes for optical imaging in vivo is also confirmed by the high-contrast photoluminescence images between the background and the UCL imaging area.
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