Recently

with the development of the 400-800nm tunable lasers which are made of copper doped inorganic glasses

much attention has been paid to the exploration of the high quality glasses doped with transition metal ions.Hence

copper doped phosphate and fluorophosphate glasses were prepared and the absorption

ESR

fluorescence excitation and life-time measurements were performed in the experiments.It is found that copper exists in the glasses

melted in the reduced atmosphere

mainly as Cu

+

and partially as Cun

Cu

2+

.With the increase of the reduction degree the content of Cu

+

increases

while the content of Cu

2+

decreases.It can be seen from the ESR measurements that the ESR signal intensities increase with the increase of Cu

2+

contents in phosphate glass

and the description of the spectra can be made by using the axial Hamiltonian.The Spin-Hamiltonian parameters are:g//=2.405;g1=2.082;|A//|=105×10

-4

cm

-1

In fluorophosphate glasses

however

no ESR signal could be clearly observed from the ESR measurement though a large enough instrumental gain was set in the experiment.It shews that few cupric ions exist in the glasses

which coincids with our melting condition.There is an absorption band due to Cu

2+

ions in phosphate glass

located at around 11000cm

-1

.It is attributed to the

2

E

8

→

2

T

2g

transition of d

9

ions in the disordered Oh sites.A strong UV absorption band around 40000cm

-1

is attributed to the 3d

10

→3d

9

4s

1

transition of Cu

+

ions.It is also a Laport forbbiden transition.A distinct band appears at-16700cm

-1

in the spectra of fluorophosphate glass

which may be identified as contribution from the colloid copper.The fluorescence spectra excited at UV range have a broad bandwidth and a large Stokes shift.This shift can simply be explained by using the configurational diagram.However

the site-inhomogeneity of ions in glasses and the effect of the lattice relaxation

we thought

had also been contributed to the shift

based upon the experience in the preceeding studies on the spectral behaviours of transition metal ions doped glasses.The peak positions and bandwidths of fluorescence spectra are 458nm(104nm)for phosphate and 420nm(107nm)for fluorophosphate glass

respectively.From the phosphate to the fluorophosphate glasses the peak positions move toward short wavelength

and the fluorescent intensities and the life-times increase(from 26ns to 60ns).It shows that with the change in glass host the ligand of the oxygen ions is replaced by the ligand of the fluorine ions.The ionic tendency of the bord between the central active ions and the ligands increases.So the coupling between the central active ions and the lattice is relaxed

and the interaction between ions and phonons is weakened.It results in the decrease of the ronradiative transition probability

and in the increase of the quantum efficiency of the luminescence.The results obtained from the excitation spectrum measurements are similar to that from the absorption measurements.The peak positions and bandwidths are 262nm(840A)for phosphate and 247nm(660A)for fluoro-phospate glass

respectively.