光谱学与光谱分析, 2016, 36 (2): 336, 网络出版: 2016-12-09  

M′型LuTaO4∶Eu3+透明闪烁厚膜的制备及性能研究

Preparation and Performances of the M′-Type LuTaO4∶Eu3+ Transparent Scintillator Films
作者单位
同济大学物理科学与工程学院, 上海市特殊人工微结构材料与技术重点实验室, 上海 200092
摘要
X射线成像在生命科学和物质微结构分析等许多方面有着非常重要的应用, X射线成像仪器核心部件之一为X射线-可见光转换屏。 透明闪烁薄膜是实现高空间分辨率X射线成像的一条有效途径。 铕掺杂M′型LuTaO4是一种性能优越的闪烁材料, 其密度高达9.75 g·cm-3, 化学性质稳定, 辐照硬度大, 有望制备成透明薄膜型高空间分辨率X射线转换屏。 以2-甲氧基乙醇为溶剂、 PVP为胶粘剂, 采用溶胶-凝胶法成功制备出M′型LuTaO4∶Eu3+透明闪烁厚膜, 并对透射率、 光致发光、 X射线激发发射光谱和空间分辨率等一系列的薄膜性能进行表征。 经过8次旋涂之后, 膜层均匀、 无裂纹, 厚度为2.1 μm, 发光波段的透射率为70%以上, 成像空间分辨率达到1.5 μm。 将厚膜作为X射线-可见光转换屏, 成功对果蝇进行了X射线成像, 其复眼结构清晰可见。 此外, 紫外和X射线激发下闪烁膜的发光特性研究表明, 该厚膜具有优良的发光性能, 已基本满足高分辨率X射线成像的要求, 有望在显微X射线成像方面获得很好应用。
Abstract
X-ray imaging has a very important role in life sciences and material microstructure analysis and other applications. One of the core components of X-ray imaging equipment is the X-rays-visible light conversion screen. Flashing transparent film is an effective way to achieve high spatial resolution X-ray imaging. M′-type LuTaO4∶Eu3+is an excellent scintillation material. It has high light yield, high density, good radiation hardness and good chemical stability. Therefore, to research and develop the transparent conversion screen with M′-type LuTaO4∶Eu3+ is very important for the application of X-ray detector in high spatial resolution X-ray imaging. In this paper, the M′-type LuTaO4∶Eu3+ transparent scintillator films were successfully prepared from the inorganic salt and 2-methoxyethanol solution containing polyvinylpyrrolidone(PVP) via sol-gel technique, and transmittance, photoluminescence, X-ray excitation emission spectral and spatial resolution, and a series of film properties were characterized. A film thickness of about 2.1 μm was achieved after 8 coatings. The thick film was homogeneous and crack free, and the transmittance was approximately 70% in its emission region. The spatial resolution of the thick film was 1.5 μm, which measured by the standard spatial resolution panels. An X-ray imageof fruit fly was obtained by using this thick film. Additionally, thesol-gel derived M′-type LuTaO4∶Eu3+thick film revealed excellent photoluminescence and X-ray excited luminescence performances. All results indicated that the M′-type LuTaO4∶Eu3+thick films have satisfied the essential requirements for applications in high-spatial-resolution X-ray imaging.

邱志澈, 顾牡, 刘小林, 刘波, 黄世明, 倪晨. M′型LuTaO4∶Eu3+透明闪烁厚膜的制备及性能研究[J]. 光谱学与光谱分析, 2016, 36(2): 336. QIU Zhi-che, GU Mu, LIU Xiao-lin, LIU Bo, HUANG Shi-ming, NI Chen. Preparation and Performances of the M′-Type LuTaO4∶Eu3+ Transparent Scintillator Films[J]. Spectroscopy and Spectral Analysis, 2016, 36(2): 336.

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