摘要
研究以Eu3+为代表的稀土离子掺杂氧化镥(Lu2O3)发光粉体的湿化学制备方法,并在此基础上研制了相应的Lu2O3基透明陶瓷材料。以氨水加碳酸氢铵溶液用作复合沉淀剂成功地制备出低团聚、颗粒类乎球形的高烧结活性Lu2O3基纳米发光粉体。采用Fourier红外光谱、差热–热重–质谱联用、X射线衍射和透射电镜等手段研究了粉体制备过程中的物理化学变化过程。在煅烧后获得Lu2O3粉体的晶粒尺寸为30~40nm,比表面积可达18m2/g。该粉体在无需黏结剂或烧结助剂的条件下,经干压等静压成型后于流动H2气氛下经1850℃,6h常压烧结后,可获得具有良好光学透明性的Eu3+掺杂Lu2O3基(Eu:Lu2O3)陶瓷材料,样品的体积密度达理论密度的99.8%,晶粒尺寸为50~60μm。双面抛光1mm厚的Eu3+:Lu2O3陶瓷样品在可见光波段的直线光学透过率可达80%以上,该样品在紫外激发条件下在610nm波长处产生很强的特征发射谱线,是一类有望在射线探测和X光数字成像领域得到应用的高性能探测材料。
A novel wet chemical approach to prepare rare-earth (Re=Eu^3+) doped Lu2O3 phosphor powder, as well as the fabrication of transparent lutetia-based ceramics were investigated. Co-precipitation processing was adopted to prepare nanosized Eu^3+ doped lutetia powders with a spherical morphology and good sinterability using ammonium hydroxide (NH3-H2O) and ammonium hydrogen carbonate (NH4HCO3) as the mixed precipitant. The thermal decomposition and phase evolution processes of precipitate precursor were investigated by Fourier transform infrared spectroscopy, thermogravimetry-differential thermal analysis--mass spectrometry, X-ray diffraction, and transmission electron microscope analysis. After calcination under the proper conditions, the resultant LU2O3 phosphor powders exhibited a well-dispersed and near-spherical morphology with primary grain sizes of about 30-40 nm and a specific surface area of about 18 m^2/g. Highly transparent polycrystalline Eu^3+ doped LU2O3 ceramics were fabricated by pressureless sintering under flowing H2 atmosphere, the relative density of specimens could theoretically reach up to 99.8%, with grain sizes of about 50-60 um after being sintered at 1850 ℃ for 6 h. Optical linear transmittance in the visible wavelength region for 5% Eu:Lu2O3 ceramics (1 mm in thickness) could reach as high as above 80% and produced a very strong emission peak at a wavelength of 610 nm under excitation of ultraviolet pulse. The luminescence behaviors of transparent lutetia ceramics indicated that they were promising detection materials and have potential for application in radiation detection and digital X-ray imaging.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2008年第6期805-810,共6页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(50572115)
上海市科委基础研究重点(06JC14029)资助项目
关键词
氧化镥
透明陶瓷
制备方法
光学透明性
稀土铕离子
lutetia
transparent ceramics
processing method
optical transparency
rare earth europium ion