Eu掺杂的高Gd玻璃荧光及闪烁发光性能研究  

Properties of luminescence and scintillation of Eu-doped high gadolinium glass

作　　者：唐春梅[1,2] 沈应龙[3] 盛秋春[1,2] 刘双[1,2] 李文涛[1,2] 王龙飞[1,2] 陈丹平[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,高功率激光单元技术研发中心,上海201800 [2]中国科学院大学,北京100049 [3]上海市科学学研究所,上海200235

出　　处：《物理学报》2013年第24期324-330,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:51272262)资助的课题~~

摘　　要：分别在空气和还原气氛下,采用高温熔融法制备了Eu掺杂(1 wt%)的15SiO2-25B2O3-30Al2O3-30Gd2O3氧化物玻璃,对二者的光致发光和闪烁发光性能进行测试.结果显示:还原气氛下制得的玻璃在395 nm紫光和X射线激发下,均可以得到450—550 nm的Eu2+蓝绿发光和615 nm的Eu3+红光;然而在不同的激发光源下,Eu2+和Eu3+发光强度比存在明显不同,395 nm紫光激发下,Eu3+发光强度仅为Eu2+的0.02倍,X射线激发下,Eu3+发光强度变为Eu2+强度的1.37倍.通过声子边带谱分析,还原后玻璃中Si形成体附近的Eu3+全部被还原为Eu2+,B和Al形成体周围的Eu3+部分被还原为Eu2+.进一步分析闪烁发光的机理表明:Gd的敏化剂作用以及B和Al形成体周围Eu2+→Eu3+的能量传递都增强了还原玻璃中Eu3+的闪烁发光性能.Eu（1 wt%） doped 15SiO2-25B2 O3-30Al2 O3-30Gd2 O3 oxide glasses are prepared by high-temperature melt-quenching method in air and reduced atmosphere, respectively. The properties of scintillation and photoluminescence of the two samples are compared. When the samples fabricated in reduced atmosphere are excited by the X-ray and 395 nm violet light, a 450–550 nm blue-green light beam from Eu2＋and a 615 nm red light beam from Eu3＋are obtained. The intensity ratios between Eu3＋and Eu2＋are obviously different under different excitation sources. The intensity ratio under the excitation of the 395 nm violet light is 0.02 while it increases to 1.37 under the X-ray excitation. By analyzing the phonon sideband spectra of the samples, it is found that the Eu3＋ions around the former of Si are completely reduced into Eu2＋ions, while only part of Eu3＋ions around the former of B and Al are reduced into Eu2＋ ions. Further investigation about the scintillation mechanism indicates that the sensitization of Gd and the energy transfer of Eu2＋→ Eu3＋near the formers of B and Al increase the scintillation performances of Eu3＋ions in the reduced glass samples.

关 键 词：高Gd玻璃 Eu2+ 闪烁发光 声子边带谱 

分 类 号：TQ171.11[化学工程—玻璃工业]