期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 221, 期 -, 页码 458-462出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.06.132
关键词
Crystallinity; Optical temperature sensor; Upconversion emission
资金
- National Natural Science Foundation of China [11374080, 11372361]
Under 980 nm excitation, optical temperature sensing properties based on the upconversion emissions of Tm3+ in LiNbO3 polycrystal and single crystal are studied in the temperature range of 323-773K. It is observed the F-3(2,3) and H-3(4) levels of Tm3+ are thermally coupled levels in both LiNbO3 polycrystal and single crystal, suggesting that the Tm3+-doped LiNbO3 crystals possess potential application in optical thermometry. Moreover, the crystallinity of host material greatly affects the optical thermometry sensitivity. The splitting degrees of upconversion emission spectra are changed with the crystallinities of LiNbO3 crystals, smaller splitting degree can result in higher absolute sensitivity. By optimizing the Tm3+ and Yb3+ ion concentrations, LiNbO3 single crystal is promising for optical high temperature sensor. These results reveal that the higher crystallinity of sensing material is beneficial to improve the sensitivity and resolution of optical temperature sensor. (C) 2015 Elsevier B.V. All rights reserved.
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