Upconversion Luminescence of Er3+/Yb3+ Co-Doped Sb2O3-WO3-Li2O Antimonate Glasses
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()( )()( )
2343 2343
5/2 11/27/27/2
FYbIErF YbF Er
+ +++
+→ +
(4)
The populated 4F7/2 level of Er3+ then relaxes rapidly
and non-radiatively to the next lower levels, 2H11/2 and
4S3/2. The above processes then produce the two transi-
tions 2H11/2-4I15/2 and 4S3/2-4I15/2, which are centered at
524 and 544 nm respectively. The trace presence of Yb3+
ions provides an additional channel to populate Er3+ ion
levels, make more Er3+ ions involving the pumped
process and thus enhance the green fluoroscence intensi-
t y.
For the red emission, it can be seen from Figure s 4, 5
and 7, the upconversio n luminescence in the red spectral
bands at 650 - 670 nm wavelength is very weak, which
means few Er3+ ion s i s involving the following processes:
( )( )
4 343
11/2 7/2
IEr.F Era hpoton
++
+→
(5)
( )( )
4 343
11/2 13/2
I ErIEr.a hpoton
++
→+
(6)
( )( )
4 343
13/2 9/2
IEr.F Era hpoton
++
+→
(7)
4. Conclusions
A serie s of Er3+/ Yb3+ co-doped Sb2O3-WO3-Li2O glasses were
prepared. Intense green upconversion fluorescence was
observed near 524 and 544 nm i n t he Er 3+/Yb3+ co-doped
Sb2O3-WO3-Li2O glasses under 980 nm excitation. The
upconversion processes were proved to involve the se-
quential two-photon absorption process for the green
emissions. The maximum phonon energy of the glass is
about 348 cm-1, which is much lower than silicate
glasses. Upon the introduction of Yb3+ ions to Er3+ doped
antimonate glasses, the upconversion fluorescence effi-
ciency is enhanced by increasing of Yb3+ concentration.
The upconversion excitation increased with the increas-
ing o f LD p owde r. T he d ata presente d in t hi s wor k mig ht
provide useful information for further development of
Er3+-doped materials for upconversion optical devices.
5. Acknowledgements
This study was supported by Shanghai Leading Aca-
demic Discipline Project (B502) and Shanghai Key La-
boratory Project (08DZ2230500).
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