Temperature dependence of photoluminescence property in BaIn2O4

The temperature-dependent photoluminescence(PL) spectra of BaIn2O4,prepared by coprecipitation,are measured and discussed.Aside from the reported 3.02-eV violet emission,the 1.81-eV yellow emission involved with oxygen vacancy is also observed at room temperature wherein the deep donor level is at 1.2 eV.With the temperature increasing,the peak energies for both emissions show a red shift.Moreover,the yellow emission intensity decreases while the violet emission intensity increases.The temperature dependence of the yellow emission intensity fits very well into the one-step quenching process equation,indicating a fitted activation energy at 19.2 meV.