Photoluminescence and scintillation of LGS (La₃Ga₅SiO₁₄), LNGA (La₃Nb_0.5Ga_5.3Al_0.2O₁₄) and LTGA (La₃Ta_0.5Ga_5.3Al_0.2O₁₄

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• 作者：Yoshisuke Futami^a ; ^{yoshisuke.futami@imr.tohoku.ac.jp} ; Takayuki Yanagida^b ; Yutaka Fujimoto^a ; Vitezslav Jary^c ; Jan Pejchal^a ; ^c ; Yuui Yokota^a ; Masae Kikuchi^a ; Martin Nikl^c ; Akira Yoshikawa^a ; ^b
• 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 ²⁴¹Am 5.5 MeV 伪-ray excited emission spectra of langasite family crystals, LGS (La₃Ga₅SiO₁₄), LNGA (La₃Nb_0.5Ga_5.3Al_0.2O₁₄) and LTGA (La₃Ta_0.5Ga_5.3Al_0.2O₁₄) 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.