The glassforming ability of the systems (GeS2)(80-x) (Ga2S3)(20). xPrC
l(3) and (GeS2)(80-x)(Ga2S3)(20). xPr(6)O(11) was determined, the homo
geneous glasses were prepared, the thermal properties, optical transmi
ssivity and luminescence of pure and Pr doped glasses were determined.
The absorption and luminescence bads were assigned to f-electron tran
sitions of Pr ions.