KONG Xianggui, XU Wu, CHEN Bacjiu, HUANG Shihua, FAN Xiwu. LOCAL ACTIONS OF REAR EARTH Yb ANDTm IN GLASS CERAMICS USEDAS LASER UPCONVERSION[J]. Chinese Journal of Luminescence, 1999,20(4): 305-310
KONG Xianggui, XU Wu, CHEN Bacjiu, HUANG Shihua, FAN Xiwu. LOCAL ACTIONS OF REAR EARTH Yb ANDTm IN GLASS CERAMICS USEDAS LASER UPCONVERSION[J]. Chinese Journal of Luminescence, 1999,20(4): 305-310DOI:
Raman scattering was used to investigate the microcrystal region in glass ceramics PbF
2
+WO
3
+GeO
2
and PbF
2
+WO
3
+GeO
2
doped with YbF
3
and TmF
3
. The spectra obtained show that this micro-crystal region in the PbF
2
+WO
3
+GeO
2
is with the composition of PbF
2
:Yb
3+
Tm
3+
in which the Yb
3+
and Tm
3+
ions are substituted for Pb
2+
resulting in some charged centers located at these impurities. These charged centers induce a local electric field which brings about:(1) some new Raman effects in addition to the Raman effects induced by the modulation of polarizability from vibrations of micro-crystal lattice
and (2) the consistency of all directions of the symmetry axes of microcrystal in PbF