摘要：掺Ce:LYSO晶体因其密度大（7。2g/cm3）对泵浦光吸收系数高，衰减时间短（约为40ns）、闪烁光输出性能好（约为17000 ph/MeV），是一类具有高光输出、快衰减特性的闪烁性晶体，在高能物理方面，它们优异的抗γ射线、中子和带电强子能力使其成为用于严苛发射环境下的量能器的候选材料，如HL-LHC。SIPAT尝试生长25 X0（28cm）长的LYSO晶体以满足功能物理应用需求。79589

本实验的Ce:LYSO晶体是在上海新漫晶体材料科技有限公司晶体生长实验室完成的，晶体的生长工艺难度：Ce:LYSO晶体熔点较高，原料昂贵，原料组分多，密度差别比较大。Ce3+的分凝系数较低，影响晶体的性能和质量。本试验采用提拉法生长Ce:LYSO晶体。此次生长的两块晶体尺寸为Φ60×140mm，在不同的温度梯度下生长，其中一块外观呈无色透明状，以肉眼观察，所生长的晶体通透性好、无明显包裹物夹杂和开裂。同时生长的另一块晶体外观呈无色透明状，但出现了明显的开裂和白丝等宏观缺陷。

    将生长质量良好的的Ce:LYSO晶体经光学抛光，加工成打磨两块长10mm厚2mm的晶体样品，测试其200-1000nm波段的透过率达到85%,晶体光学质量良好、激发与发射光谱谱、衰减时间、粉末XRD等性能的表征。

本论文通过文献调研、晶体生长以及物相坚定和光学性能表征，熟悉了Ce:LYSO晶体的物理化学性质，掌握了其提拉法生长过程、质量控制参数、光谱性能表征等，了解了Ce:LYSO晶体在高能物理、高端医疗等方面的应用。

毕业论文关键词：提拉法；硅酸钇镥，闪烁晶体，光输出；衰减时间；

Study on Optical Properties of Yttrium Lutetium Chloride Scintillation Crystals

Summary：The Ce: LYSO crystal has a high light absorption coefficient (about 40ns) and a good flashing light output (about 30000 ph / MeV) due to its high density (7。2g / cm3) High-light output, fast fading characteristics of the scintillation of the crystal, in the high-energy physics, their excellent resistance to γ-ray, neutron and charged hadron capacity to make it for the harsh emission environment of the scaler candidate materials, such as HL -LHC。 SIPAT attempts to grow 25 X0 (28 cm) long LYSO crystals to meet functional physical application requirements。

In this experiment, Ce: LYSO crystal is completed in Shanghai Crystal Technology Co。, Ltd。 crystal growth laboratory, crystal growth process difficulty: Ce: LYSO crystal melting point is higher, expensive raw materials, raw material components, the density difference is relatively large。 Ce3 + has a low coefficient of condensation, which affects the performance and quality of the crystal。 In this experiment, Ce: LYSO crystals were grown by pulling。 The growth of the two crystal size Φ60 × 140mm, in different temperature gradient growth, one of which was a colorless and transparent appearance, with the naked eye observation, the growth of the crystal permeability is good, no obvious inclusion inclusions and cracking The At the same time the growth of another crystal appearance was colorless and transparent, but there have been significant cracking and white silk and other macroscopic defects。

The crystal of Ce: LYSO with good growth quality was polished and polished to polish two crystal samples with length of 10mm and thickness of 2mm。 The transmittance of the Ce: LYSO crystal was 85%, the optical quality of the crystal was good, the excitation and emission spectra Spectrum, decay time, powder XRD and other properties of the characterization。

In this paper, the physical and chemical properties of Ce: LYSO crystal were studied by literature research, crystal growth, solidification and optical properties。 The growth process, quality control parameters and spectral performance of Ce: LYSO crystal were studied。 LYSO crystal in high-energy physics, high-end medical and other aspects of the application。