Luminescence Spectra of SrA112O19：Pr^3＋, Mn^2＋ under VUV-UV Excitation

Luminescence spectra of SrAl12O19：Pr^3＋,Mn^2＋ under VUV-UV excitation are investigated. The characteristic emissions between 4f levels and the excitation of 5d for Pr^3＋ are observed. The emission of Mn^3＋ peaks at 517nm and the excitations clue to the ground to multiplets are observed at 276, 360, 386 and 426nm. However, the spectral overlap between the emission of Pr^3＋ and excitation of Mn^2＋ is absent, suggesting that the quantum splitting cannot be achieved via a Pr^3＋ Mn^2＋ ion pair in the host SrAl12O19.     

Y2O2S：Eu，Ti，Mg红色长余辉的温度依赖

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。