Role of Yttrium in Thermoluminescence of LYSO:Ce Crystals

被引：14

作者：

Chen, Lu ^{[1
,2
]}

Ding, Dongzhou ^{[1
,4
,5
]}

Fasoli, Mauro ^{[3
]}

Wang, Tiantian ^{[1
,4
]}

Chen, Xiaopu ^{[1
,4
]}

Zhao, Shuwen ^{[1
,4
]}

Chen, Jie ^{[1
]}

Sun, Yiyang ^{[1
]}

Li, Jiang ^{[1
]}

Wu, Yuntao ^{[1
,4
]}

Feng, He ^{[2
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201899, Peoples R China

[2] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200444, Peoples R China

[3] Univ Milano Bicocca, Dept Mat Sci, I-20125 Milan, Italy

[4] Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Beijing 100049, Peoples R China

[5] R&D Ctr Shanghai Inst Ceram, Shanghai 201899, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2020年 / 124卷 / 32期

基金：

中国国家自然科学基金;

关键词：

RARE-EARTH; SCINTILLATION MECHANISM; LUMINESCENCE; TRAPS; LSO; GROWTH; SITES; IONS;

D O I：

10.1021/acs.jpcc.0c03370

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

This paper presents a detailed study of the influence of yttrium (Y) concentration on thermally stimulated luminescence (TSL) of LYSO:Ce crystals and establishes the relationship between electron traps and scintillation properties. With the increase of Y concentration, the glow curve shifts toward higher temperatures and the trap depth increases gradually. Our results revealed two groups of electron traps with one shallow (E-t approximate to 0.10-0.26 eV) and one deep (E-t approximate to 1.00-1.21 eV). Our TSL results suggest that the amount of shallow traps varied with Y content has a positive correlation with energy resolution, while the amount of deep traps is inversely proportional to light output. In order to analyze the variation trend of trap depths and their mechanism in detail, we calculated the band gap with the PBE functional and VUV excitation spectra. The results show that the increase of band gap possibly leads to the increase of deep electron trap depth.

引用

页码：17726 / 17732

页数：7

共 38 条

[1] Defects Identification and Effects of Annealing on Lu2(1-x)Y2xSiO5 (LYSO) Single Crystals for Scintillation Application [J].