期刊
CHEMPHYSCHEM
卷 17, 期 5, 页码 766-770出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201500724
关键词
core-shell structures; energy transfer; luminescence; nanoparticles; upconversion
资金
- National Natural Science Foundation of China [21303149]
- Research Grants Council of Hong Kong [CityU 109413]
- Science Technology and Innovation Committee of Shenzhen Municipality [JCYJ20130401145617278]
- CityU for a Strategic Research Grant [7004199]
Surface coating is a commonly used strategy to enhance upconversion emissions by shielding the luminescent core from surface quenching. In this work, we provide insights into the effect of surface coating on upconversion by investigating NaYF4:Yb/Er nanoparticles and the corresponding NaYF4:Yb/Er@NaYF4 core-shell nanoparticles, as a function of dopant concentration of Yb3+ and excitation power. We observe declining emission enhancement factors with decreasing Yb3+ concentration and increasing excitation power. Our mechanistic investigations suggest that the phenomenon originates from stepwise excitation in the upconversion process, as well as energy hopping among the Yb3+ dopants. This increased understanding of the effect of surface coating on upconversion should be important towards the rational design of lanthanide-doped core-shell nanoparticles for various applications.
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