Undoped and Ce-doped CaLaAl 3 O 7 crystals were synthesized by the optical floating zone method and photoluminescence and scintillation properties were evaluated. A broad peak at 420 nm due to the 5d-4f transitions of Ce 3+ is observed from the Ce-doped samples based on the measurement of photoluminescence and scintillation spectra. The photoluminescence and scintillation decay time constants attributable to the 5d-4f transitions of Ce 3+ are obtained in the Ce-doped samples. The 1.0% and 3.0% Ce-doped samples show relatively high scintillation light yields of 230–260 ph/5.5 MeV- α from pulse height analysis under irradiation of α -rays from 241 Am. The best afterglow level is 160 ppm in the 3.0% Ce-doped sample among the present samples.

中文翻译：

---

Ce掺杂CaLaAl 3 O 7晶体闪烁体的光致发光和闪烁特性

通过光学浮区法合成了未掺杂和铈掺杂的CaLaAl 3 O 7晶体，并评估了光致发光和闪烁特性。基于光致发光和闪烁光谱的测量，从Ce掺杂的样品中观察到由于Ce 3+的5d-4f跃迁而在420 nm处出现的宽峰。在Ce掺杂的样品中获得了归因于Ce 3+的5d-4f跃迁的光致发光和闪烁衰减时间常数。掺杂1.0％和3.0％的铈的样品在241 Am的α射线辐照下，通过脉冲高度分析显示出较高的闪烁光输出，为230–260 ph / 5.5 MeV-α。在本样品中，3.0％Ce掺杂样品中的最佳余辉含量为160 ppm。