Luminescent materials synthesis and characterizations. Rare earth (RE)/Ln3+ Co-Doped oxides (Borate, Phosphate, Silicate etc.) Glasses for Optical Devices (LEDs, Laser etc.) Glasses are prepared via melt quenching technique Photoluminescence characterizations are carried out. Florescence decay time are performed. Energy transfer efficiency is calculated. spectral parameters are evaluated via Judd-Ofelet (JO) Theory. IH model is used for confirmation of Energy Transfer nature.