ISSN:
1551-2916
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Er2O3-doped PbO-Bi2O3-Ga2O3 glasses were prepared through the conventional melt-quenching method, and the energy transfer mechanisms in Er3+ were investigated. The fluorescent emission at 2.73 μm, which is normally quenched in silicate glasses, became evident because of the low phonon energy of PbO-Bi2O3-Ga2O3 glasses. The measured lifetime of the upper level of 4I11/2 was 0.9 ms, and it decreased to ∼0.6 ms with increased Er3+ concentration. When the concentration of Er2O3 was 0.05 wt%, the coefficient of the cross-relaxation rate for the 4I11/2 level was ∼18 times larger than that of the 4I13/2 level. On the other hand, the interaction parameter of energy migration was considerably larger for the 4I13/2 level (∼52 × 10−40 cm6·s−1) compared with the 4I11/2 level (∼3.1 × 10−40 cm6·s−1). Therefore, the major energy transfer mechanism associated with the 4I13/2 level was migration induced, whereas that for the 4I11/2 level was direct cross relaxation of 4I11/2:4I11/2→4F7/2:4I15/2.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1151-2916.1999.tb02153.x
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