Journal
CHEMISTRY OF MATERIALS
Volume 25, Issue 1, Pages 106-112Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm3033498
Keywords
core/shell; fluorescence; nanoparticles; upconversion
Funding
- NSFC [21101029, 21273041, 21210004]
- China National Key Basic Research Program (973 Project) [2013CB934100, 2012CB224805, 2010CB933901]
- Shanghai Rising-Star Program [12QA1400400]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRF12001]
- Fudan Startup Foundation for Advanced Talents
- Key Subjects Innovative Talents Program of Fudan University
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One pot successive layer-by-layer (SLBL) strategy is introduced to fabricate the core/shell upconversion nanoparticles (NPs) for the first time by using high boiling-point Re-OA (rare-earth chlorides dissolved in oleic acid at 140 degrees C) and Na-TFA-OA (sodium trifluoroacetate dissolved in oleic acid at room temperature) as shell precursor solutions. This protocol is flexible to deposit uniform multishell on both hexagonal (beta) and cubic (alpha) phase cores by successive introducing of the shell precursor solutions. Shell thickness of the obtained NPs with narrow size distribution (sigma < 10%) can be well controlled from 1 monolayer (similar to 0.36 nm) to more than 20 monolayers (similar to 43 nm) by simply tuning the amounts of the shell precursors. Furthermore, the tunable doping positions (core doping and shell doping) can also be achieved by adjusting the species and addition sequence of the shell precursors. As a result of the high quality uniform shell and advanced core/shell structures, the optical properties of the obtained core/shell NPs could be improved in upconversion luminescence efficiency (up to 0.51 +/- 0.08%), stability (more resistant to quenching by water) and multicolor luminescence emission.
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