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Journal of Nanomaterials
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Journal of Nanomaterials
/
2010
/
Article
/
Fig 1
/
Research Article
Dynamics of the Green and Red Upconversion Emissions in
-
-Codoped
Nanorods
Figure 1
Energy levels diagram of Y
2
O
3
β:βEr
3+
, Yb
3+
nanorods and the considered direct Yb
3+
to Er
3+
nonradiative energy transfer processes: (i)
π
(
Y
b
1
0
β
E
r
0
2
)
, (ii)
π
(
Y
b
1
0
β
E
r
1
3
)
, and (iii)
π
(
Y
b
1
0
β
E
r
2
4
)
.
