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Multifunctional Eu3+- and Er3+/Yb3+-doped GdVO4 nanoparticles synthesized by reverse micelle method
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Multifunctional Eu3+- and Er3+/Yb3+-doped GdVO4 nanoparticles synthesized by reverse micelle method
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Journal Article
Multifunctional Eu3+- and Er3+/Yb3+-doped GdVO4 nanoparticles synthesized by reverse micelle method
2014
Overview
Synthesis of Eu
3+
- and Er
3+
/Yb
3+
-doped GdVO
4
nanoparticles in reverse micelles and their multifunctional luminescence properties are presented. Using cyclohexane, Triton X-100 and
n
-pentanol as the oil, surfactant and co-surfactant, respectively, crystalline nanoparticles with ~4 nm diameter are prepared at low temperatures. The particle size assessed using transmission electron microscopy is similar to the crystallite size obtained from X-ray diffraction measurements, suggesting that each particle comprises a single crystallite. Eu
3+
-doped GdVO
4
nanoparticles emit red light through downconversion upon UV excitation. Er
3+
/Yb
3+
-doped GdVO
4
nanoparticles exhibit several functions; apart from the downconversion of UV radiation into visible green light, they act as upconvertors, transforming near-infrared excitation (980 nm) into visible green light. The ratio of green emissions from
2
H
11/2
→
2
I
15/2
and
4
S
3/2
→
4
I
15/2
transitions is temperature dependent and can be used for nanoscale temperature sensing with near-infrared excitation. The relative sensor sensitivity is 1.11%K
−1
, which is among the highest sensitivities recorded for upconversion-luminescence-based thermometers.
Publisher
Nature Publishing Group UK,Nature Publishing Group
