Abstract

${\mathrm{Yb}}^{3+}{\mathrm{Er}}^{3+}$-codoped chloride-modified germanate–bismuth–lead glasses have been synthesized by the conventional melting and quenching method. Structural and thermal stability properties have been obtained on the basis of the Raman spectra and differential thermal analysis, which indicate that the ${\mathrm{PbCl}}_2$ addition has an important influence on the phonon density of states, maximum phonon energy, and thermal stability of host glasses. The Judd–Ofelt intensity parameters and quantum efficiencies were calculated on the basis of the Judd–Ofelt theory and lifetime measurements. For the $1.53\mu \mathrm{m}$ emission band, the full widths at the half-maximum increase and peak wavelengths are blueshifted with increasing ${\mathrm{PbCl}}_2$ content. Moreover, the effect of the ${\mathrm{PbCl}}_2$ addition on the phonon density of states, ${\mathrm{OH}}^{-}$ content, and upconversion luminescence has been discussed and evaluated. Our results reveal that, with increasing ${\mathrm{PbCl}}_2$ content, the decrease of phonon density and ${\mathrm{OH}}^{-}$ content contributes more to the enhanced upconversion emissions than that of maximum phonon energy.

© 2005 Optical Society of America

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