Synthesis of SrAl₂O₄: Eu²⁺Dy³⁺phosphorescence nanosized powder by combustion method and its optical properties

Abstract

Eu2+ Dy3+ codoped strontium aluminate (SrAl2O4) nanosized phosphorescent powder with high brightness and long afterglow were prepared by urea-nitrate solution combustion method at 540°C for 5 minutes. The average particle size of the powders was about 80 nm. The photoluminescent and thermoluminescent properties have been studied. The broad band photoluminescence of SrAl2O4: Eu2+ Dy3+ were observed with maximun wavelength λmax = 516 nm due to transitions from the 4f65d1 to 4f7 configuration of the Eu2+ ions. The main peak of the emission spectra shifted to the short wavelength compared with phosphorescence obtained by the solid state reaction method. The decay time of the afterglow for nanosized phosphorescence was shorter than that obtained by the solid state reaction method.