Journal
JOURNAL OF RARE EARTHS
Volume 36, Issue 11, Pages 1136-1140Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jre.2018.04.008
Keywords
Hydrothermal synthesis; Upconversion; Temperature sensing; Optical heater; NaGdF4; Rare earths
Categories
Funding
- National Natural Science Foundation of China [11747312]
- Natural Science Foundation of Zhejiang Province [LY15A040003, LY15F040002]
- Zhejiang Xinmiao Talents Program [2017R427026]
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An optical heater based on hexagonal NaGdF4:Yb3+/Er3+ is reported. XRD, SEM and EDS characterization results show that F-/Ln(3+) can not only control the phase composition, particle size and morphology, but also affect the effective doping concentration of Yb3+ and Er3+. When F-/Ln(3+) is 12/1, the strongest upconversion luminescence is obtained. Based on the luminescent temperature sensing behavior of Er3+, the photo-thermal conversion performance was investigated. The results indicate that the temperature of irradiation spot is linearly dependent on the power density, and the photo-thermal responsivity is determined to be 3.3 K.cm(2)/W. Also, it is found that the photo-thermal conversion efficiency can be regulated by changing the Yb3+ doping concentration. Compared with the nano-gold, copper sulfide and carbon nanotubes, the NaGdF4:Yb3+/Er3+ has the triple functions of upconversion luminescence, temperature sensing, and photo-thermal conversion, and may therefore be a promising optical heater for photo-thermal therapy of tumors. (C) 2018 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
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