Persistent luminescence and thermoluminescence of UV/VIS -irradiated SrAl sub(2O) sub(4): Eu super(2+, Dy) super(3)+ phosphor

The persistent luminescence and thermoluminescence properties of SrAl sub(2O) sub(4): Eu super(2+, Dy) super(3)+ phosphors excited with UV-VIS light in the 200-500 nm region were investigated. The thermoluminescence glow curve was found to be composed of peaks around 70, 125 and 245 degree C. The persistent luminescence and thermoluminescence excitation spectra exhibited a broad band around 300-500 nm centered at 400 and 420 nm respectively. A linear behavior of the integrated thermoluminescence intensity and persistent luminescence versus irradiation time was found for the first 60 s. The charge detrapping from the 70 degree C trapping levels was the major contributor to the observed persistent luminescence at room temperature. The SrAl sub(2O) sub(4): Eu super(2+, Dy) super(3)+ phosphors have suitable properties to be applied as storage and persistent luminescence UV-VIS irradiation dose phosphor.