Abstract: A new type phosphor SrAl₂O₄:Eu with long persistent aftergrow in the system of SrO-Al₂O₃ was reported in this paper.The phosphor was found in the SrAl₂O₄ monoclinic crystal structure as measured by X-ray powder diffraction.The luminescence of phosphor was the typical d-f transition of Eu²⁺, according to the excitation spectrum and emission spectrum. After excitation by the UV fluorescent lamp, the aftergrow luminescence of phosphor could last 10 h with a hyperbola type decay, showing the characteristic of recombination luminescence.The measurements of thermoluminescence spectra showed that there were two thermoluminescence peaks lying at 333°K and 378°K, reflecting that the electron traps existed in the Phosphor. furthermore,experiments exhibited that the impurity component Mg formed the electron traps and made the phosphor possess the long aftergrow luminescence property.

Key words: thermoluminescence, phosphor, aftergrow