大尺寸Ce：Lu1.6Y0.4SiO5闪烁晶体的生长和光谱特性

采用中频感应提拉法生长出尺寸为Ф60mm×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.Ce^3＋的4f^1→5d^1跃迁吸收导致紫外区产生三个吸收带.发射光谱具有Ce^3＋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

Cerium-doped Lu1.6Y0.4SiO5 (LYSO) crystal with a dimension of phi 60mm X 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+ 4f(1) -> 5d(1) 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.