Photoluminescence and scintillation of LGS (La<sub>3sub>Ga<sub>5sub>SiO<sub>14sub>), LNGA (La<sub>3sub>Nb<sub>0.5sub>Ga<sub>5.3sub>Al<sub>0.2sub>O<sub>14sub>) and LTGA (La<sub>3sub>Ta<sub>0.5sub>Ga<sub>5.3sub>Al<sub>0.2sub>O<sub>14
- 作者：Yoshisuke Futami<sup>asup><sup> ; sup><sup>yoshisuke.futami@imr.tohoku.ac.jpsup> ; Takayuki Yanagida<sup>bsup> ; Yutaka Fujimoto<sup>asup> ; Vitezslav Jary<sup>csup> ; Jan Pejchal<sup>asup><sup> ; sup><sup>csup> ; Yuui Yokota<sup>asup> ; Masae Kikuchi<sup>asup> ; Martin Nikl<sup>csup> ; Akira Yoshikawa<sup>asup><sup> ; sup><sup>bsup>
- 关键词：La3Ga5SiO14 ; La3Nb0.5Ga5.3Al0.2O14 ; La3Ta0.5Ga5.3Al0.2O14 ; Alpha-ray ; Photoluminescence ; Scintillation
- 刊名：Optical Materials
- 出版年：2012
- 期刊代码：81_09253467
- 类别：ch
- 出版时间：July, 2012
- 卷：34
- 期：9
- 页码：1513-1516
- 文件大小：636 K
摘要
To examine scintillation response of piezoelectric crystals the <sup>241sup>Am 5.5 MeV 伪-ray excited emission spectra of langasite family crystals, LGS (La<sub>3sub>Ga<sub>5sub>SiO<sub>14sub>), LNGA (La<sub>3sub>Nb<sub>0.5sub>Ga<sub>5.3sub>Al<sub>0.2sub>O<sub>14sub>) and LTGA (La<sub>3sub>Ta<sub>0.5sub>Ga<sub>5.3sub>Al<sub>0.2sub>O<sub>14sub>) were measured. Dominating emission bands were observed at 378 nm for LGS, 556 nm for LNGA and 425 nm for LTGA. X-ray excited radioluminescence intensity of these crystals was quantitatively compared with BGO standard scintillator. Photoluminescence 2D-spectra were measured as well and compared with radioluminescence ones. In LTGA also photoluminescence decays were measured for two dominant contributing emission centers.
Observed emission bands within 300-360 nm and beyond 400 nm most probably belong to self-trapped or trapped excitons and lattice defects, respectively.