采用高温固相法在弱还原气氛中,1300 ℃合成了掺杂Eu2+和Dy3+离子的SrAl2O4。 对比研究了 SrAl2O4:Eu2+和 SrAl2O4:Eu2+,Dy3+的余辉特性和热释光谱, 并探讨了Dy3+的掺杂对 SrAl2O4:Eu2+陷阱能级的影响。XRD 分析表明: Eu2+和Dy3+的掺杂没有改变 SrAl2O4的晶相。光致发光分析表明: Dy3+的掺杂没有改变 SrAl2O4:Eu2+的 光致发光光谱和 发光中心。热释光谱对比分析结果显示: Eu2+的掺杂在 SrAl2O4 的禁带中引入了两个深度不同的陷阱能级; Dy3+的掺杂 不改变原来陷阱能级的深度,却能够显著地增加原来浅陷阱能级的密度,从而改善 SrAl2O4:Eu2+的余辉特性。不同等 待时间的热释光谱曲线显示：在室温下,不同陷阱能级衰减规律的差异以及陷阱能级间存在的电子转移,可能造 成了 SrAl2O4:Eu2+, Dy3+ 长余辉材料复杂的余辉衰减规律。

Phosphors SrAl2O4 doped by Eu2+ and Dy3+ ions were synthesized by a solid-state reaction at 1300 ℃ under mild reducing atmosphere of N2 -H2 . The properties of afterglow and thermoluminescence spectra of SrAl2O4:Eu2+and SrAl2O4:Eu2+, Dy3+ were compared and the influence on trap levels of SrAl2O4:Eu2+by codoping Dy3+ was also studied. From the XRD and photoluminescence results, the crystal phase and luminescence band are not changed by codoping Dy3+. The thermoluminescence spectra show that the dopant of Eu2+ions could lead into two trap levels with different depth in SrAl2O4. The result of comparison of thermoluminescence properties of SrAl2O4:Eu2+and SrAl2O4:Eu2+, Dy3+ after different delay time indicates that the density of the original shallow traps is increased by the codopant of Dy3+, and the luminescence performance is improved. The thermoluminescence with different delay time indicates that the luminescence decay difference and electron transfer between trap levels in SrAl2O4:Eu2+, Dy3+ may result in the complicated decay phenomena of the afterglow.