In part I of this series of papers

[1]

the absorption

excitation and emission spectra of Ce

3+

Tb

3+

Er

3+

and Tm

3+

ions in phosphate

germanate tellurete glasses have been reported. In this paper experimental and calculated results of radiative and nonradiative transition rate of these ions in verious glasses are given. Radiative transition rates are calculated with intensity parameters

which is obtained by fitting the absorption spectra with Judd-Ofelt

[2]

theory. Because the luminescence lifetime of Ce

3+

Er

3+

and Tm

3+

is rather short and difficult to be determined

less work on relaxation processes of these ions in glasses has been done. Exciting the samples with short pulsed (pulse width 10ns) from an exciter laser

lifetimes of fluorescent ions are measured. Nonradiative transition rates are then calculated from the measured lifetimes and radiative transition rates.