摘要
Lu2SiO5∶Ce具有高密度、高光产额、快衰减等优点,是一种性能优异的新型X射线闪烁薄膜材料。本文采用溶胶-凝胶工艺和旋涂技术,以无机盐为原料、2-甲氧基乙醇为溶剂、聚乙二醇(PEG)为改性剂,在石英基片上成功制备出Lu2SiO5∶Ce透明薄膜,较为详细地研究了PEG对该薄膜发光性能的影响。结果表明当采用浓度为12.5%的PEG200时,所制备薄膜的质量和发光强度最为理想;通过多次旋涂,Lu2SiO5∶Ce透明薄膜厚度可达0.9μm。
To achieve high-spatial-resolution for X-ray imaging and flat panel display,transparent thin-film phosphors have been attracted much attention in recent years.In comparison with conventional powder phosphors,the transparent thin-film phosphors have some outstanding advantages such as high contrast and resolution,superior thermal conductivity and better adhesion.Cerium-doped lutetium oxyorthosilicate Lu2SiO5（LSO） is one promising candidate due to its high density（7.4 g·cm-3）,high light yield（27 300 photons·MeV-1）,short decay time（40 ns）,and excellent chemical stability.The sol-gel method is one of the most important techniques for deposition of functional thin films,because it possesses a number of advantages over conventional film formation techniques,such as low processing temperature,easy coating of large surfaces,homogenous multicomponent films,and cheap equipments.In X-ray imaging application,the thickness of the thin-film phosphor is the most important factor,which can increase X-ray absorption of the film and then strengthen its luminescence intensity.In the present work,transparent LSO∶Ce film was successfully prepared using sol-gel method and spin-coating technique by using inorganic salts as raw materials,2-methoxyethanol as solvent,and poly（ethylene glycol）（PEG） as modifier without inert atmosphere.The effect of PEG on the luminescence properties of the film was investigated in detail.The results indicated that PEG200 played an important role in the formation of LSO∶Ce film,improving its quality and luminescent intensity.The film thickness of 0.9 μm was achieved after 5 times of coating.The luminescence properties of the film were studied.Their performances were good,which implied that the film would have promising applications in high-spatial-resolution X-ray imaging and flat panel display devices.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2011年第2期344-348,共5页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金项目(10974143,10875085)
上海市科学技术委员会项目(07DZ22302)资助
