Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 133, Issue 43, Pages 17122-17125Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja207078s
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Funding
- NSFC [20825101, 91027004]
- State Key Basic Research Program of China [2011AA03A407, 2012CB932403]
- Shanghai Sci. Tech. Comm. [11XD1400200, 1052nm03400]
- [IRT0911]
- [B108]
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By thermal decomposition in the presence only of oleylamine, sub-10 nm hexagonal NaLuF4-based nanocrystals codoped with Gd3+, Yb3+, and Er3+ (or Tm3+) have been successfully synthesized. Sub-10 nm beta-NaLuF4: 24 mol % Gd3+, 20 mol % Yb3+, 1 mol % Tm3+ nanocrystals display bright upconversion luminescence (UCL) with a quantum yield of 0.47 +/- 0.06% under continuous-wave excitation at 980 nm. Furthermore, through the use of beta-NaLuF4: Gd3+,Yb3+,Tm3+ nanocrystals as a luminescent label, the detection limit of <50 nanocrystal-labeled cells was achieved for whole-body photoluminescent imaging of a small animal (mouse), and high-contrast UCL imaging of a whole-body black mouse with a penetration depth of similar to 2 cm was achieved.
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