中文摘要：

采用温梯法生长了Ce：YAG晶体和真空烧结法制备了Ce：YAG透明陶瓷,并对晶体和透明陶瓷的光学和闪烁性能进行了对比研究.Ce：YAG晶体和陶瓷都具有位于230,340和460nm波段的Ce3＋离子的特征吸收带和540nm附近的发射峰,但Ce：YAG晶体同时存在296和370nm的色心吸收,其发射峰位于398nm,而透明陶瓷中不存在.Ce：YAG晶体和陶瓷的X射线荧光中均存在520nm附近的Ce3＋离子发射,但晶体中还存在由反格位缺陷引起的300nm的发射.Ce：YAG晶体和陶瓷的光产额分别为16800和9800photons/MeV,纳秒灯激发下的荧光寿命分别为61.9和62.97ns.Ce：YAG晶体与陶瓷相比,具有高的光产额和快的荧光衰减特性.

英文摘要：

In this work, Ce：YAG crystal and transparent ceramics were prepared by the temperature gradient technique （TGT） and sintering in vacuum, respectively. The optical and scintillation properties of the as-prepared Ce：YAG crystal and ceramics were investigated and compared. Both crystal and ceramics show typical Ce3＋ absorption bands at 230,340 and 460 nm and a 540 nm emission peak. However, the color center absorption bands at 296 and 370 nm with an emission peak at 398 nm were also observed in the TGT crystal. X-ray fluorescence spectra of crystal and ceramics show an emission peak at 520 nm, but another emission peak at 300 nm was found in the crystal which can be attributed to the Y_Al antisite defects. An average light output of 16800 and 9800 photons/MeV and a single exponential decay with the decay time constants of 61.9 and 62.97 ns were found in the as-prepared Ce：YAG crystal and ceramics. Compared with Ce：YAG ceramics, Ce：YAG crystal shows a higher light yield and faster response.