Enhanced luminescence properties of ZnGa2O4:Cr3+ nanoparticles with an average crystallite size of 5 nm

摘要

ZnGa2O4:Cr3+ nanophosphors with an average crystallite size of 5 nm were prepared by a combustion method. We observed changes in the luminescence properties compared with the micro-crystalline system, such as a high brightness emission band at 696 nm and a decrease in the persistent luminescence decay time for the near infrared emission. The system does not show a change in the band gap. The emission intensity for the broad band with near-infrared emission was very high under excitation with both UV and visible wavelengths.