Near infrared photoluminescence of Mg, Ca doped Bi4Ge3O12 crystals and glasses

Spectral properties in Mg and Ca doped Bi4Ge3O12 (BGO) crystals and glasses were investigated. Near-infrared (NIR) photoluminescence was observed in Mg and Ca doped Bi4Ge3O12 (BGO) crystals, while NIR emission in doped BGO glasses was very weak. There is no fundamental difference about NIR emission between Mg2+ and Ca2+ doped BGO crystals, and the emission center is still related to Bi ions, the doped ions can influence energy level of Bi ions.