摘要
采用溶胶-凝胶法制备了Lu2Si2O7∶Ce纳米晶,利用X射线衍射(XRD)、扫描电镜(SEM)、荧光光谱仪、X射线激发发射谱仪对制备的Lu2Si2O7∶Ce纳米晶的晶相结构、微观形貌和光学性能进行了表征。结果表明,溶胶-凝胶法制备的Lu2Si2O7∶Ce前驱体在煅烧温度为1000℃时开始晶化,晶粒尺寸随着煅烧温度的升高而变大,1200℃煅烧2 h后的晶体颗粒均匀,分散性最优,平均晶粒尺寸约为28.9 nm,呈近球形;Lu2Si2O7∶Ce纳米晶的紫外吸收谱存在峰位分别为304 nm和350 nm两个吸收峰,源自于Ce^3+离子的4f→5d跃迁;光致发射谱和X射线激发发射谱都表现为典型的非对称双峰结构,归属于Ce^3+离子的5d^1→2F5/2和5d^1→2F7/2跃迁,Ce^3+离子的最佳掺杂浓度约为1%;荧光衰减时间约为37.2 ns,可满足高时间分辨X射线探测需要。
Cerium-doped lutetium pyrosilicate Lu2Si2O7∶Ce nanocrystalline was synthesized by the sol-gel method.The structure,morphologies and scintillation properties of Lu2Si2O7∶Ce nanocrystalline were characterized by X-ray diffractometer(XRD),scanning electron microscope(SEM),photoluminescence and X-ray excited luminescence.The results indicate that Lu2Si2O7∶Ce starts to crystallize at about 1000℃and the crystallite size increases with the increasing calcining temperature.Well dispersed,homogeneous and near-spherical Lu2Si2O7∶Ce powder with an average grain size about 28.9 nm was obtained after sintering at 1200℃for 2 h.The excitation spectrum consists of two intense broad bands at 304 nm and 350 nm,which are corresponding to the 4f→5d transition of Ce^3+ions.The emission peak under 350 nm and X-ray excitation both exhibit a typical asymmetric peak,which are attribute to 5d^1→2F5/2 and 5d^1→2F7/2 transition of the Ce^3+ions.The optimized doping concentration of Ce^3+ion is about 1%.The decay time of the as-prepared Lu2Si2O7∶Ce phosphor is about 37.2 ns,which can satisfy the requirement of the X-ray detection with high time resolution.
作者
李乾利
胡亚华
马玉彬
黄世明
顾牡
张志军
赵景泰
LI Qian-li;HU Ya-hua;MA Yu-bin;HUANG Shi-ming;GU Mu;ZHANG Zhi-jun;ZHAO Jing-tai(School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;Jiaxing University Nanhu College, Jiaxing 314001, China;School of Physics Science and Engineering, Tongji University, Shanghai 200092, China)
出处
《发光学报》
EI
CAS
CSCD
北大核心
2020年第4期364-370,共7页
Chinese Journal of Luminescence
基金
国家自然科学基金(11475128,11675121,11905122)
嘉兴市科技计划(2017AY13015)资助项目。
