title: 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 CaWO4phosphors 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 CaWO4system. Moreover, the relative sensitivity SRand the absolute sensitivity SAare proved to be dependent on the pump power of 980 nm laser. The sensitivities of SRand SAin Yb3+-Er3+co-doped CaWO4increase about 31.5% and 12%, respectively, by doping with 1 mol% Sr2+.
authors.affiliation: College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210046, People's Republic of China.|Department of Physics and Interdisciplinary Program of Biomedical, Mechanical &Electrical Engineering, Pukyong National University, Busan 608-737, Republic of Korea.
authors.forename: Xiangfu
authors.initials: X
authors.lastname: Wang
authors.affiliation: College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210046, People's Republic of China.
authors.forename: Yemin
authors.initials: Y
authors.lastname: Wang
authors.affiliation: College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210046, People's Republic of China.
authors.forename: Yanyan
authors.initials: Y
authors.lastname: Bu
authors.affiliation: College of Electronic Science and Engineering, Nanjing University of Posts and Telecommunications, Nanjing, 210046, People's Republic of China.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Yan
authors.affiliation: Department of Physics and Interdisciplinary Program of Biomedical, Mechanical &Electrical Engineering, Pukyong National University, Busan 608-737, Republic of Korea.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Physics and Interdisciplinary Program of Biomedical, Mechanical &Electrical Engineering, Pukyong National University, Busan 608-737, Republic of Korea.
authors.forename: Peiqing
authors.initials: P
authors.lastname: Cai
authors.affiliation: Department of Physics and Interdisciplinary Program of Biomedical, Mechanical &Electrical Engineering, Pukyong National University, Busan 608-737, Republic of Korea.
authors.forename: Thiquynh
authors.initials: T
authors.lastname: Vu
authors.affiliation: Department of Physics and Interdisciplinary Program of Biomedical, Mechanical &Electrical Engineering, Pukyong National University, Busan 608-737, Republic of Korea.
authors.forename: Hyo Jin
authors.initials: HJ
authors.lastname: Seo