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We investigated the physicochemicаl properties, structure and optical properties of the Ge 25 Ga 9.5 Sb 0.5 S 65 : Er 3+ /Yb 3+  glasses. The Judd-Ofelt theory was used to calculate the intensities of the intra-4 f  electronic transitions of Er 3+  ions. We observed the upconversion photoluminescence (UCPL) at 530, 550, 660 and 810 nm under 980 nm excitation. In the Ge 25 Ga 9.5 Sb 0.5 S 65 : 0.1 at.% Er 3+ , we found that the Stokes photoluminescence (PL) at the green spectral region excited by the 490 and 532 nm laser is only ≈5 times higher than the UCPL emission under 810 or 980 nm excitation making these materials attractive for UCPL applications. The addition of 0.1–1 at.% of Yb 3+  into Ge 25 Ga 9.5 Sb 0.5 S 65 : 0.1 at.% Er 3+  glass reduces the UCPL as well as the Er 3+  ≈1.5 μm emission intensity probably due to the reabsorption processes of the excitation light and concentration quenching. However, the observed Er 3+ :  4  S  3/2 → 4  I  13/2  (≈850 nm) emission in the Ge 25 Ga 9.5 Sb 0.5 S 65 : 0.1 at.% Er 3+  sample populates the  4  I  13/2  level, which promises the using of this material for the 1.5 μm optical amplification.

Physico-chemical and optical properties of Er 3+ -doped and Er 3+ /Yb 3+ -co-doped Ge 25 Ga 9.5 Sb 0.5 S 65 chalcogenide glass