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Journal of Nanomaterials
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Journal of Nanomaterials
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2015
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Article
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Fig 4
/
Research Article
Upconversion Luminescence Properties of Y
2
O
3
:Yb, Er and Y
2
O
2
S:Yb, Er Nanoparticles Prepared by Complex Precipitation
Figure 4
Schematic energy level diagram of Yb
3+
and Er
3+
ions under excitation of 980 nm LD.