Shallow electron traps formed by Gd2+ ions adjacent to oxygen vacancies in cerium-doped Gd3Al2Ga3O12 crystals

被引：11

作者：

Kitaura, Mamoru ^{[1
]}

Watanabe, Shinta ^{[2
]}

Kamada, Kei ^{[3
]}

Kim, Kyoung Jin ^{[4
]}

Yoshino, Masao ^{[4
]}

Kurosawa, Shunsuke ^{[1
,3
]}

Yagihashi, Toru ^{[1
]}

Ohnishi, Akimasa ^{[1
]}

Hara, Kazuhiko ^{[5
]}

机构：

[1] Yamagata Univ, Fac Sci, Yamagata 9908560, Japan

[2] Nagoya Univ, Grad Sch Engn, Nagoya, Aichi 4648603, Japan

[3] Tohoku Univ, New Ind Creat Hatchery Ctr, Sendai, Miyagi 9808579, Japan

[4] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[5] Shizuoka Univ, Res Inst Elect, Hamamatsu, Shizuoka 4328011, Japan

来源：

APPLIED PHYSICS LETTERS | 2018年 / 113卷 / 04期

基金：

日本学术振兴会;

关键词：

LOW-TEMPERATURE THERMOLUMINESCENCE;

D O I：

10.1063/1.5043218

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

To clarify the origin of shallow electron traps in cerium-doped Gd3Al2Ga3O12 (Ce:GAGG), the optical properties of cerium-doped Lu3-xGdxAl2Ga3O12 crystals were investigated. Absorption spectra for x = 3 exhibited a prominent band at 12 000 cm(-1) when excited by 3.31-eV ultraviolet light. This band has been previously attributed to shallow electron traps at defect complexes associated with oxygen vacancies. When Gd3+ ions were replaced with Lu3+ ions, the 12 000cm(-1) band weakened and disappeared completely for Ce:Lu3Al2Ga3O12. In addition, thermally stimulated luminescence glow curves were observed. Optically stimulated luminescence indicated that the energy of the conduction band minimum did not change by the presence of Lu3+ ions. Thus, the Gd3+ ions were important for the formation of shallow electron traps in Ce:GAGG. First-principles calculations implied that Gd3+ ions responsible for shallow electron traps formed antisite defects at GAGG octahedral sites. Hence, defect complexes of antisite Gd2+ ions adjacent to oxygen vacancies were the most plausible candidates for shallow electron traps in Ce:GAGG. Published by AIP Publishing.

引用

页数：4

共 24 条

[1] Energy transfer based NIR to visible upconversion: Enhanced red luminescence from Yb3+/Ho3+ co-doped tellurite glass [J].