The temperature-dependent structural and optical properties of SrAl2O4-based phosphor

This research studied the thermal stability of SrAl2O4 : Eu2+, Dy3+ phosphor for the fabrication of luminescent glasses. The temperature-dependent structural and optical properties of the phosphor were investigated. The results showed that SrAl2O4 : Eu+, Dy3+ phosphor could emit the green light when excited by ultraviolet (UV) light. It was also found that annealing could induce further growth of SrA2O4 crystals, which gave rise to more intense green-light emission. However, at high annealing temperature, the luminescence attained a maximum and started decreasing. An intense luminescence was observed for the SrAl2O4 : Eu2+, Dy3+ phosphor annealed at 750°C. The phosphor degradation at temperatures above 750°C could be because of the formation of secondary phases and the oxidation of the rare-earth atoms that were doped in phosphor. The results showed that, with proper fabrication processes, phosphors could be considered as promising materials for various applications.