Cr3+ impurity concentration and excitation dependences of magnesium gallate spinel photoluminescent data

Optical and structural properties of Ni2+-doped magnesium gallate polycrystalline samples

“…In this paper we present photoluminescence data of Ni 2+ ions as substitutional impurities at the Mg 2+ sites in MgGa 2 O 4 (magnesium gallate). In last years we observed luminescence in magnesium gallate doped with Co 2+ [15], Mn 2+ [16], Cr 3+ [17] and Fe 3+ [18] and Ni 2+ [19]. In a previous work on MgGa 2 O 4 :Ni 2+ [19] the used excitation source was a He-Ne laser with wavelength 632.8 nm.…”