NIU Shuang-shuang, YOU Fang-tian, SHI Qiu-feng etc. Synthesis and Luminescence Properties of LaF<sub>3</sub>:Eu<sup>3+</sup>/LaF<sub>3</sub> Core/Shell Nanoparticles with Different Shell Thickness[J]. Chinese Journal of Luminescence, 2014,35(3): 276-281
NIU Shuang-shuang, YOU Fang-tian, SHI Qiu-feng etc. Synthesis and Luminescence Properties of LaF<sub>3</sub>:Eu<sup>3+</sup>/LaF<sub>3</sub> Core/Shell Nanoparticles with Different Shell Thickness[J]. Chinese Journal of Luminescence, 2014,35(3): 276-281 DOI: 10.3788/fgxb20143503.0276.
Coating the nanoparticles with a homogeneous shell is a feasible strategy to reduce energy losses on the nanoparticle surface. Eu
3+
doped hexagonal LaF
3
nanoparticles with a mean size of 7~8 nm were prepared by co-precipitation method. After coating the LaF
3
:Eu
3+
core particles with the undoped LaF
3
the enhancement of Eu
3+
emission in LaF
3
:Eu
3+
/LaF
3
core-shell nanoparticles was discovered. In comparison with the LaF
3
:Eu
3+
core
the luminescence lifetime of Eu
3+
emission in core-shell nanoparticles was increased. The decay curves of LaF
3
:Eu
3+
/LaF
3
core/shell nanoparticles with different thickness had also been studied. The increase of the luminescence lifetime of Eu
3+
emission resulted from the effective shielding of the luminescence center Eu
3+
ions from LaF
3
:Eu
3+
core
the quenching at or near the surface of the nanoparticles was reduced.
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references
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