采用高温固相法制备了不同Ce3+掺杂浓度的12CaO·7Al2O3(C12A7∶x%Ce3+)陶瓷样品。在350 nm紫外光激发下,样品的发射光谱呈现为主峰位于440 nm的宽带,来源于Ce3+的5d1→ 2F5/2和2F7/2的辐射跃迁。随着Ce3+掺杂浓度的增加,发射强度增大;当Ce3+摩尔分数超过0.7%时,有杂质相出现。为了进一步提高光致发光强度,采用自蔓延燃烧法合成了C12A7∶0.5%Ce3+陶瓷样品。在H2气氛下热处理,通过改变笼中阴离子基团的种类和数目提高了陶瓷闪烁特性(发光强度和衰减时间)。结果表明,C12A7∶Ce3+陶瓷是可应用于闪烁体的潜在材料。

12CaO·7Al2O3∶Ce3+ (C12A7∶x%Ce3+) transparent ceramics were synthesized by a solid state method. Upon 350 nm UV excitation,a broad emission band located around 440 nm can be observed and it can be attributed to the transitions from 5d1 to 2F5/2 and 2F7/2 of Ce3+,respectively. It can be seen that the emitting intensity increases with the increasing of Ce3+ doping concentration. When the mole fraction of Ce3+ exceeds 0.7%,other impurities appear. To enhance the emitting intensity,C12A7∶0.5%Ce3+ transparent ceramics were prepared by a self-propagating combustion method. For the samples annealed in H2 ambient,the scintillation properties,such as the emitting intensity and decay time,are improved by controlling sorts and amounts of encaged anions in C12A7. The experiment results show that Ce3+ doped C12A7 might be a potential scintillation material.