【摘要】 采用湿化学法合成了Eu原子掺量5%的Lu₂O₃陶瓷前驱体,通过SEM、XRD研究了煅烧前后前驱体和1 100℃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1 650℃真空烧结30 h制备了高透过率的Eu∶Lu₂O₃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∶Lu₂O₃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∶Lu₂O₃陶瓷存在极强的⁵D₀→⁷F₂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85 000 ph/MeV。Eu∶Lu₂O₃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∶Lu₂O₃陶瓷在X射线成像等领域具有巨大的潜在应用价值。更多还原

【Abstract】 The 5% Eu∶Lu₂O₃ ceramic precursor was synthesized by wet chemical method, and the morphologies, microstructures and phases of both Eu∶Lu₂O₃ ceramic precursor and the calcined Eu∶Lu₂O₃ 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 1 100 ℃ for 4 h as raw material, the highly transparent Eu∶Lu₂O₃ ceramics were successfully fabricated by vacuum sintering at 1 650 ℃ for 30 h.The grain size is calculated to be about 46 μm, and in-line transmittance of the Eu∶Lu₂O₃ 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∶Lu₂O₃ ceramics were studied. It can be observed that the absorption curve of Eu∶Lu₂O₃ 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∶Lu₂O₃ ceramics that an extremely strong peak is located at 611 nm, corresponding to the ⁵D₀→⁷F₂ transition of Eu³⁺. By comparison with the BGO crystal, the light output of the Eu∶Lu₂O₃ ceramics is estimated to be about 85 000 ph/MeV. Eu∶Lu₂O₃ ceramics have an excellent X-ray stopping power due to its high density and effective atomic number. It is indicated that Eu∶Lu₂O₃ ceramics are a potential ceramic scintillator for the application of X-ray detection imaging combined with the characteristics of high light output.更多还原