期刊
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
卷 113, 期 12, 页码 1594-1600出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jqsrt.2012.04.001
关键词
Heating effect; Thermal probe; Luminescence; CIE diagram; Upconversion; Nanoheater
资金
- University Grants Commission
- CSIR New Delhi
Yb3+/Ho3+ co-doped calcium aluminate phosphor has been synthesized using solution combustion process. Multicolored (blue, green and red) strong upconversion emission (lambda(exc)=980 nm) due to Ho3+ ion is observed which shows a color tunability (from green to red) with a variation in input laser power. The color tunability has been attributed to be due to the induced heating in the local volume of the sample and the temperature produced has been estimated using the fluorescence intensity ratio (FIR) method. The sample shows temperature sensing behavior and more importantly the temperature could be sensed through two pairs of thermally coupled levels, one lying in the green region (F-5(4)/S-5(2)-> I-5(8)) and the other in the blue region ((5)G(4)/(5)G(5)-> I-5(8)). The temperature sensing through the blue pair of levels is novel in itself. The material thus prepared serves as temperature sensor as well as a source for the production of heat in a localized volume. (C) 2012 Elsevier Ltd. All rights reserved.
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