期刊
ADVANCED FUNCTIONAL MATERIALS
卷 21, 期 23, 页码 4470-4477出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201101040
关键词
ionic liquid; two-phase; phase transition; rare-earth nanocrystals; upconversion luminescence
类别
资金
- National 863 Hi-tech Project of China [2007AA022004]
- National Key Basic Research Program (973 Project) [2010CB933901, 2011CB933100]
- Important National Science & Technology Specific Projects [2009ZX10004-311]
- National Natural Scientific Fund [20803040]
- New Century Excellent Talent of Ministry of Education of China [NCET-08-0350]
- Shanghai Science and Technology Fund [10XD1406100]
- Shanghai Jiao Tong University
A novel OA/ionic liquid two-phase system combining the merits of thermal decomposition method, the IL-based strategy, and the two-phase approach is introduced to synthesize high-quality lanthanide-doped NaGdF4 upconversion nanocrystals with different crystal-phases in OA-phase and IL-phase through a one-step controllable reaction. Oil-dispersible cubic-phase NaGdF4:Yb, Er (Ho, Tm) nanocrystals with ultra-small size (similar to 5 nm) and monodispersity are obtained in the OA phase of the two-phase system via an IL-based reaction. More importantly, water-soluble hexagonal-phase NaGdF4:Yb, Er nanocrystals are obtained in the same system simply by adopting an extremely facile method to complete the dual phase-transition (crystal-phase transition and OA-phase to IL-phase transition) simultaneously. The synthesized lanthanide-doped NaGdF4 upconversion nanocrystals are effective for dual-mode UCL imaging and CT imaging in vivo.
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