Y_2O_2S∶Eu,Ti,Mg红色长余辉的温度依赖  

Temperature Dependence of Red Long Afterglow from Y_2O_2S∶Eu,Ti,Mg

作　　者：周东方[1] 施朝淑[1] 戚泽明[2] 刘淼[1] 陶冶[3] 刘波[1] 陈永虎[1] 

机构地区：[1]中国科学技术大学物理系,安徽合肥230026 [2]中国科学技术大学国家同步辐射实验室,安徽合肥230029 [3]中国科学院高能物理所,北京100039

出　　处：《中国稀土学报》2006年第1期18-21,共4页Journal of the Chinese Society of Rare Earths

基　　金：国家科技部863项目资助(2002AA324060)

摘　　要：实际应用中在低温下一些长余辉材料不能正带工作，因此需要研究长余辉材料的温度依赖特性。用固相反应法合成了Y2O2S：Eu，Ti，Mg，测量了其余辉发射谱和热释光曲线，研究Y2O2S：Eu，Ti，Mg在140～300K和290～350K温区的长余辉发光的发射光谱和衰减曲线的温度依赖。当温度低于其热释光曲线起始点230K时，其余辉的发射光谱强度较弱。随温度增加，其余辉的发射光谱强度随温度增强。300K后，其余辉衰减时间随温度变快。Y2O2S：Eu，Ti，Mg长余辉的温度依赖行为与其热释光曲线密切相关，并通过长余辉机制对其进行了分析和讨论。At low temperature, some long-lasting phosphors could not work well in practical applications. So it is necessary to investigate the temperature dependence of the phosphors. The Y2O2S ： Eu, Ti, Mg microcrystalline samples were prepared by solid state reaction method. Phosphors were sintered at 1150℃ for 20 min in air, putting in and taking out both at high temperature. The emission spectra and the afterglow spectra as well as the thermoluminescence curve were measured for Y2O2S ： Eu, Ti, Mg. Its temperature dependence of the afterglow spectra and decay curves were studied from 140 to 300 K and from 290 to 350 K respectively. When the temperature is lower than 230 K, namely the start temperature point in its thermoluminescence curve, the intensity of the afterglow emission is leasing electrons weak, due to the from traps is very probability of resmall. With tem-perature rising from 230 to 290 K, the intensity of the afterglow emission are gradually increased and the thermoluminescence curve is going up. The reason is that the probability of releasing electrons from traps is becoming bigger and bigger. With temperature rising from 290 to 350 K, the decay time of the afterglow becomes quicker and quicker. As from 290 to 350 K the thermoluminescence curve is going down, the temperature is higher than the thermoluminescence peak 278.5 K indicating that the traps are rather shallow, and the electrons would be released from traps more easily and quicker. The behavior of the temperature dependence of the long afterglow of Y202S ： Eu, Ti, Mg is closely related with its thermoluminescence curve, and it was analyzed and discussed with the long-lasting phosphorescence mechanisms.

关 键 词：Y2O2S:Eu TI Mg 长余辉 稀土 

分 类 号：O482.3[理学—固体物理]