Investigation of structural and optical properties: Tm2O3/Dy2O3 codoping in P2O5-MgO-NaF-CaF2 glass

•The composition mole ratio and processing parameters used were different from others.•A novel Dy3+/Tm3+-doped phosphate glass for W-LED application has been prepared.•The glass has high thermal stability (90.48% of the initial intensity at 100°C).•Energy transfer efficiency from Dy3+ to Tm3+ is high (64.44%) compared to others.•These glasses have excellent CCTs, chromaticity coordinates, moisture-resistance.