Influence of Doping and Excitation Powers on Optical Thermometry in Yb3+-Er3+ doped CaWO4.

Abstract:

:Optical thermometry has been widely studied to achieve an inaccessible temperature measurement in submicron scale and it has been reported that the temperature sensitivity depends mainly on host types. In this work, we propose a new method to improve the optical temperature sensitivity of Yb3+-Er3+ co-doped CaWO4 phosphors by doping with Li+, Sr2+, and Mg2+ ions and by controlling excitation powers of 980 nm laser. It is found that the thermometric parameters such as upconversion emission intensity, intensity ratio of green-to-red emission, fluorescence color, emission intensity ratios of thermally coupled levels (2H11/2/4S3/2), and relative and absolute temperature sensitivity can be effectively controlled by doping with Li+, Sr2+, and Mg2+ ions in the Yb3+-Er3+ co-doped CaWO4 system. Moreover, the relative sensitivity SR and the absolute sensitivity SA are proved to be dependent on the pump power of 980 nm laser. The sensitivities of SR and SA in Yb3+-Er3+ co-doped CaWO4 increase about 31.5% and 12%, respectively, by doping with 1 mol% Sr2+.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wang X,Wang Y,Bu Y,Yan X,Wang J,Cai P,Vu T,Seo HJ

doi

10.1038/srep43383

subject

Has Abstract

pub_date

2017-02-27 00:00:00

pages

43383

issn

2045-2322

pii

srep43383

journal_volume

7

pub_type

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