SrSO4:Eu磷光体的光释光特性

研究了通过掺杂得到的SrSO4:Eu(01mol%)的粉末样品的光释光(OSL)特性.用90Sr的β射线辐照0116—116kGy后，测定了恒定光源激发的光释光发光曲线(CW-OSL)和线性光源激发的光释光发光曲线(LW-OSL)，对发光曲线分析均得到了四种陷阱成分.采用复合作用响应函数得到SrSO4:Eu辐射剂量响应为线性-亚线性.测量了温度对OSL信号的影响，结果表明OSL信号的温度稳定性很好，最灵敏读出温度约为180℃，说明这时OSL信号来自热激发和光激发的共同作用.用60Coγ辐照100Gy后，测量了热释光(TL)三维光谱，确定了发光波长主要位于375nm，可以确定这是来自于Eu2+能级跃迁的发光. 关键词： 光释光 热释光 SrSO4:Eu

Optically stimulated luminescence in SrSO4: Eu phosphors

The optically stimulated luminescence (OSL) of SrSO4:Eu (01mol%) powder samples was studied. The continuous wave OSL and linearly modulated OSL curves measured after irradiation by beta rays of 90Sr in the dose range of 0116—116kGy, illustrate that there are four components in OSL signal and the OSL dose response is linear-sublinear. Thermal stability of OSL signal was also measured, and the results showed that OSL from SrSO4:Eu is quite stable a t temperatures up to ～200℃. Meanwhile, the intensity of OSL signal is stronges t when the read temperature is about 180℃. The thermal luminescence(TL) three-d imensional spectra were measured after gamma rays irradiation (absorbed dose is 100Gy) of 60Co source. The emission wavelength at about 375nm indicate s that the luminescence comes from the transitions between energy levels of Eu 2+.