摘要
采用湿化学法合成了Eu原子掺量5%的Lu_(2)O_(3)陶瓷前驱体,通过SEM、XRD研究了煅烧前后前驱体和1100℃煅烧4 h后粉体的形貌、结构以及物相。结果表明煅烧后的粉体为纳米类球形、高分散且结晶性良好的颗粒。颗粒尺寸为68.5 nm。使用煅烧后的粉体为原料,在1650℃真空烧结30 h制备了高透过率的Eu∶Lu_(2)O_(3)陶瓷,晶粒尺寸为46μm,在611 nm处的直线透过率可以达到66.3%。此外对陶瓷的吸收曲线、光致激发和发射光谱特性以及X射线激发发射光谱进行研究。可观察到,Eu∶Lu_(2)O_(3)陶瓷存在基质和激活离子两类吸收,光致发光光谱和X射线激发发射光谱均可以看出Eu∶Lu_(2)O_(3)陶瓷存在极强的5D 0→7F 2跃迁发光,位于611 nm处。对比商业的BGO单晶的X射线发射光谱,可得本实验中制备的陶瓷的光输出为85000 ph/MeV。Eu∶Lu_(2)O_(3)陶瓷本身有着高X射线以及高能粒子的阻止能力,结合高光输出特性,表明Eu∶Lu_(2)O_(3)陶瓷在X射线成像等领域具有巨大的潜在应用价值。
The 5%Eu∶Lu_(2)O_(3) ceramic precursor was synthesized by wet chemical method,and the morphologies,microstructures and phases of both Eu∶Lu_(2)O_(3) ceramic precursor and the calcined Eu∶Lu_(2)O_(3) ceramic powders were studied by SEM and XRD.The results show that the powders are spherical,well-dispersed and good crystalline.The particle size is calculated to be about 68.5 nm.Using the powders calcined at 1100℃for 4 h as raw material,the highly transparent Eu∶Lu_(2)O_(3) ceramics were successfully fabricated by vacuum sintering at 1650℃for 30 h.The grain size is calculated to be about 46μm,and in-line transmittance of the Eu∶Lu_(2)O_(3) ceramics reaches 66.3%at 611 nm.What’s more,the absorption curve,the excitation spectrum,the emission spectrum and the X-ray excited emission spectrum of the Eu∶Lu_(2)O_(3) ceramics were studied.It can be observed that the absorption curve of Eu∶Lu_(2)O_(3) ceramics is consisted of the matrical absorption and active ion absorption.It can be seen from the photo-luminescence emission spectrum and X-ray excited emission spectrum of the Eu∶Lu_(2)O_(3) ceramics that an extremely strong peak is located at 611 nm,corresponding to the 5D 0→7F 2 transition of Eu 3+.By comparison with the BGO crystal,the light output of the Eu∶Lu_(2)O_(3) ceramics is estimated to be about 85000 ph/MeV.Eu∶Lu_(2)O_(3) ceramics have an excellent X-ray stopping power due to its high density and effective atomic number.It is indicated that Eu∶Lu_(2)O_(3) ceramics are a potential ceramic scintillator for the application of X-ray detection imaging combined with the characteristics of high light output.
作者
王静
葛烨
解伟锋
陈昊鸿
李江
WANG Jing;GE Ye;XIE Weifeng;CHEN Haohong;LI Jiang(College of Materials Science and Engineering,Anhui University of Science and Technology,Huainan 231001,China;Key Laboratory of Inorganic Materials with Transparent Light Function,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China)
出处
《人工晶体学报》
CAS
北大核心
2021年第3期435-440,476,共7页
Journal of Synthetic Crystals
基金
中国科学院透明光功能无机材料重点实验室开放课题(KLTOIM201609)。
