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大尺寸 Ce:Lu1.6Y0.4SiO5闪烁晶体的生长和光谱特性

严成锋, 赵广军, 张连翰, 徐军   

  1. 中国科学院上海光学精密机械研究所, 上海 201800
  • 收稿日期:2004-11-01 修回日期:2004-12-10 出版日期:2005-11-20 网络出版日期:2005-11-20

Crystal Growth and Optical Characterization of Large-sized Cerium-doped Lu1.6Y0.4SiO5

YAN Cheng-Feng, ZHAO Guang-Jun, ZHANG Lian-Han, XU Jun   

  1. Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2004-11-01 Revised:2004-12-10 Published:2005-11-20 Online:2005-11-20

摘要: 采用中频感应提拉法生长出尺寸为φmm×110mm的Ce:Lu1.6Y0.4SiO5(LYSO)晶体, 与LSO晶体相比, LYSO晶体的优势是提高了晶体质量、降低了熔点和原料成本等. 在室温下测试了LYSO晶体的透过光谱、激发光谱和发射光谱, 结果表明Y的加入使LSO晶体的吸收边向短波方向偏移. Ce3+的4f1→5d1跃迁吸收导致紫外区产生三个吸收带. 发射光谱具有Ce3+典型的双峰特征, 经Gaussian多峰值拟合, 双峰395nm和418nm归属于Ce1发光中心, 而435nm的发光峰与Ce2发光中心有关.

关键词: LYSO, 闪烁晶体, 提拉法, 光学特性

Abstract: Cerium-doped Lu1.6Y0.4SiO5 (LYSO) crystal with a dimension of φ60mm×110mm was grown by the Czochralski method. Advantages of LYSO Czochralski growth relative to LSO include reduced
melting point, less propensity for formation of crystalline inclusions, lower cost of starting material. Its optical transmission, excitation and emission
spectra of LYSO crystal were measured at room temperature. Results indicate that with the yttrium ion doping, absorption edge of LSO crystal is shifted
towards short wavelength. Three absorption bands of LYSO are formed, which assign to the Ce3+ 4f1→5d1 transitions at room temperature. The
Gaussian fits to the emission spectra of LYSO crystal excited with 358nm, show band characteristics with two peaks of 395 and 418nm, which assign to
Ce1 site, and with the emission peak at 435nm, to Ce2 site.

Key words: LYSO crystal, scintillator, Czochralski method, characterization

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