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Upconversion luminescent property and EPR study of NaGdF4:Yb3+/Tm3+ synthesized by the hydrothermal method |
Jing LIU,Jing-Ying ZHANG,Kai LIU,Hong-Jian GAO,Xiao-Long YU,Yang CAO,Zhong-Xin LIU( ) |
| Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, Hainan University, Haikou 570228, China |
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Abstract Water soluble upconversion (UC) luminescence hexagonal-phase NaGdF4: Yb3+/Tm3+ nanoparticles have been successfully synthesized by the hydrothermal method. XRD, SEM, UC photoluminescence spectra and electron paramagnetic resonance (EPR) spectrum were used to characterize the nanoparticles. The intensity of UC emission region could be controlled through different sodium source and the fluorine source, 6PJ→8S7/2 emission of Gd3+ is also observed at 310 nm. A broad spectrum with a dominant resonance at g of about 2 was observed by the EPR spectrum of the NaGdF4:Yb3+/Tm3+ nanoparticles. The transparent NaGdF4:Yb3+/Tm3+ solution presented naked eye-visible violet-blue light under the 980 nm LD excitation. The current work paves the way for their potential application in infrared tomography and magnetic resonance imaging (MRI).
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| Keywords
hydrothermal method
sodium source
fluorine source
electron paramagnetic resonance (EPR)
magnetic resonance imaging (MRI)
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Corresponding Author(s):
Zhong-Xin LIU
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Online First Date: 03 June 2015
Issue Date: 23 July 2015
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