Xiong Yifei, Shi Yun, Wang Haibo, Zhang Qian, Wu Tong, Yuan Qiang, Ma Kaicheng, Li Tongtong, Zhou Zhenzhen, Fang Jinghong, He Huan, Ni Jinqi, Liu Qian, Yu Jiangding, Cui Sheng, Shichalin Oleg, Papynov Eugeniy
School of Material Science and Engineering, Nanjing Tech University, Nanjing 211816, China.
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China.
Materials (Basel). 2022 Dec 17;15(24):9025. doi: 10.3390/ma15249025.
Ce, Pr co-doped LuAlO (Ce, Pr:LuAG) single crystals and ceramics were prepared using the optical floating zone (OFZ) and reactive vacuum sintering methods, respectively. The microstructure, photo- (λ = 450 nm), and radio-luminescence (under X-ray excitation) performance, as well as scintillation light yield (LY, under γ-ray, Cs source) of both materials, were investigated and compared. Ce, Pr:LuAG ceramics had an in-line transmittance of approximately 20% in the visible light range, while the analogous crystals were more transparent (~65%). The X-ray excited luminescent (XEL) spectra showed the characteristic Ce and Pr emissions located at 310 nm, 380 nm, and 510 nm. The highest LY of the Ce, Pr:LuAG ceramics reached 34,112 pho/MeV at 2 μs time gate, which is higher than that of a single crystal. The ratio of LY values (LY2/LY0.75) between shaping times of 0.75 μs and 2 μs indicated a faster scintillation decay of ceramics regarding single crystals. It was ascribed to the lower effective concentration of luminescent activators in single crystals because of the coefficient segregation effect.
分别采用光学浮区法（OFZ）和反应真空烧结法制备了铈、镨共掺杂的钇铝石榴石（Ce, Pr:LuAG）单晶和陶瓷。研究并比较了这两种材料的微观结构、光致发光（波长λ = 450 nm）和放射性发光（在X射线激发下）性能，以及闪烁光产额（LY，在γ射线、铯源下）。Ce, Pr:LuAG陶瓷在可见光范围内的直线透过率约为20%，而类似的晶体更透明（约65%）。X射线激发发光（XEL）光谱显示，特征性的铈和镨发射峰位于310 nm、380 nm和510 nm处。Ce, Pr:LuAG陶瓷在2 μs时间门处的最高光产额达到34,112光电子/兆电子伏，高于单晶。0.75 μs和2 μs成型时间之间的光产额值之比（LY2/LY0.75）表明，陶瓷的闪烁衰减比单晶更快。这归因于由于系数偏析效应，单晶中发光激活剂的有效浓度较低。
