期刊
APPLIED SURFACE SCIENCE
卷 270, 期 -, 页码 712-717出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2013.01.133
关键词
Upconversion nanomaterial; Plasmon-enhancement; Yb3+-Er3+-Gd+3 codoped NaYF4; Sputtering
类别
资金
- National Natural Science Foundation of China [11274119, 61275038]
- Pujiang Talent Program of Shanghai Science and Technology Commission [11PJ1402700]
- Large Instruments Open Foundation of East China Noemal University
We report enhanced up-conversion (UC) photoluminescence (PL) in Ag nanoparticles/SiO2/NaYF4: Yb, Er, Gd film sandwiched structures. The effect of SiO2 layer thickness on the up-converting optical properties in the sandwiched system was investigated. The UC emission enhancement shows a pronounced distance dependence for the silica spacer layer thickness below 20 nm. The UC emission spectrum of the hybrid structured sample shows a continuous increase in intensity as the thickness of the SiO2 layer increases from 0 nm to 15 nm, but displays a quick decrease when the thickness of the SiO2 layer increases further from 15 nm. Time-resolved photoluminescence spectroscopy reveals that the fluorescence lifetimes are reduced both for green and red emissions. PL spectroscopy and excitation power studies also show that Ag nanoparticles modified the UC process in this sandwiched structure. We demonstrate switching between PL quenching and enhancement by varying the silica interface thickness. This approach allows us to perform a quantitative analysis of the effect of a metal on the UC nanorods PL intensity. (c) 2013 Elsevier B.V. All rights reserved.
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