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- Title
Improving upconversion luminescence efficiency in Er-doped NaYF nanocrystals by two-color laser field.
- Authors
Yao, Yunhua; Xu, Cheng; Zheng, Ye; Yang, Chengshuai; Liu, Pei; Ding, Jingxin; Jia, Tianqing; Qiu, Jianrong; Zhang, Shian; Sun, Zhenrong
- Abstract
Improving upconversion luminescence efficiency of lanthanide-doped nanocrystals is always a hot topic for scientists because of its very important application in photonics, photovoltaics, biological imaging, security printing, and therapeutics. Two-color laser field has shown to be a well-established strategy to further improve the upconversion luminescence efficiency. Here, we first propose a two-color laser field combining the 850 and 980 nm lasers to improve the green and red upconversion luminescence efficiency in Er-doped NaYF nanocrystals. In this work, an important advantage for our strategy is that the population is directly pumped to the radiation energy level of the upconversion luminescence by a cooperation excitation process, but not the spontaneous decay from other higher energy levels, and so the higher luminescence enhancement efficiency can be obtained. These studies also provide a clear physical picture for the physical control mechanism of the upconversion luminescence efficiency improvement, which can pave a way to properly design the laser fields in the future study of upconversion luminescence generation and control.
- Subjects
PHOTON upconversion; LUMINESCENCE; NANOCRYSTALS; RARE earth metals; PHOTOVOLTAIC power generation; PHOTONICS
- Publication
Journal of Materials Science, 2016, Vol 51, Issue 11, p5460
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-016-9849-z