Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 133, Issue 2-3, Pages 617-620Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2012.01.025
Keywords
Optical materials; Nanostructures; Luminescence; Optical properties
Categories
Funding
- Fundamental Research Funds for the Central Universities [DC10020105, 017004, 2011ZD032, 2011QN152, 2011ZD033]
- Foundation of Education Department of Liaoning Province [2009A148, L2010056]
- NSFC (National Natural Science Foundation of China) [61078061, 11104024, 11104023]
- Dalian Nationalities University [2009B301]
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Yb3+/Er3+ co-doped Gd6WO12 nanoparticles were prepared via a coprecipitation technique and characterized by means of XRD and FE-SEM. The effect of excitation power density in different regions on the upconversion mechanisms was investigated. It was found that the green upconversion emissions is a two photons process when the excitation power density is low, but a three photons process occurs when the excitation power density is high. However, the red upconversion emission is still a two photons process. A possible mechanism for three photons green upconversion luminescence was proposed and discussed. (C) 2012 Elsevier B.V. All rights reserved.
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