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New Sb₂O₃–PbO–ZnO and Sb₂O₃–PbO–ZnS glasses have been prepared and characterized by basic physicochemical parameters such as the temperatures of glass transition (T_g) and crystallization (T_p), density (ρ) and microhardness (HV). The thermal stability ΔT=T_p−T_g is found to be considerably larger for the ZnO-containing system (130–210°C) in comparison to ZnS-containing one (80–120°C). The glasses studied have high ρ and HV values, 5.65–5.80gcm⁻³ and 284–352kgmm⁻² for both the systems, respectively. The compositional dependences of these parameters are discussed in relation to structural hypothesis. Er-doped samples exhibit all five 4f–4f inner shell radiative transitions falling into the studied range 600–1600nm. Broad band luminescence of the host glass centered at about half the band gap has been observed at low temperature. The re-absorption of the host glass luminescence due to …