摘要
采用坩埚下降法生长了Mo:Sb:PbWO4(Mo:Sb:PWO)晶体。通过透射光谱、X射线激发的发射谱、光产额和荧光寿命的测试,研究了Mo,Sb双掺杂对PbWO4晶体的光谱和闪烁性能的影响。结果表明:与未掺杂晶体相比,掺杂样品提高了PWO晶体在350～430nm波段的透过率,消除了350nm吸收,吸收边变得陡峭并且向长波方向偏移。Mo:Sb:PWO晶体的发光谱存在400～650nm的宽带,发光主峰为510nm,发光强度得到提高。尺寸为10mm×10mm×20mm的Mo:Sb:PWO晶体样品,在1000ns的积分时间门宽内光产额最大值可达70photon-electrons/MeV,约为Bi4Ge3O12(BGO)光产额的7.2%。光产额的提高主要来自于Mo:Sb:PbWO4晶体发光中的慢发光成分的增加。
The Mo：Sb：PbWO4 （Mo：Sb：PWO） crystals were grown by the Bridgman technique. The influences of co-doping of Mo and Sb on the luminescence spectra and scintillation properties of PbWO4 crystal were investigated by correlated measurements of transmission spectra, X-ray excited luminescence spectra, light yields and luminescence decay time. The results show that compared with the undoped PWO sample, the transmittance of Mo：Sb：PWO crystal in the 350--430 nm range increases; its 350 nm absorption peak is removed. The optical absorption edge of the Mo：Sb：POW crystal becomes sharper and its absorption cut-off edge shifts to the red. The luminescence spectra oft he Mo：Sb：PWO crystal exhibit a wide band of 400-650 nm, and the highest luminescence peak at about 510 nm is greatly enhanced. The maximum light yield of the Mo：Sb：PWO crystal with a size of 10 mm × 10 mm × 20 mm and a gate width of 1 000 ns can reach 70 photon-electrons/MeV, and it is about 7.2% of the light yield in Bi4Ge3O12（BGO）. The increment of light yield can be mainly attributed to the increase of the slow component of luminescence in the Mo：Sb：PWO crystal.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2009年第8期1311-1315,1321,共6页
Journal of The Chinese Ceramic Society
基金
2008上海大学创新基金
中国科学院高性能陶瓷和超微结构国家重点实验室开放基金SKL200806SIC资助项目
关键词
钼和锑共掺杂钨酸铅晶体
透射光谱
光致发光谱
光产额
闪烁晶体
molybdenum and stibium-doped lead tungstate crystal
transmission spectra
photoluminescence spectra
light yield
scintillation crystal
