TY - JOUR
T1 - Probing shallow electron traps in cerium-doped Gd3Al2Ga3O12 scintillators by UV-induced absorption spectroscopy
AU - Kitaura, Mamoru
AU - Kamada, Kei
AU - Kurosawa, Shunsuke
AU - Azuma, Junpei
AU - Ohnishi, Akimasa
AU - Yamaji, Akihiro
AU - Hara, Kazuhiko
N1 - Funding Information:
Acknowledgments The authors are grateful to R. Inaba for assistance in the experiment. This study was supported through KAKENHI (Grant No. 26420673) from the Japan Society for the Promotion of Science (JSPS), the Cooperative Research Project of the Research Institute of Electronics, Shizuoka University, and the Inter-University Cooperative Research Program of the Institute for Materials Research, Tohoku University. This work was performed at the UVSOR facility under the Joint Studies Program of the Institute for Molecular Science (Proposal No. 27-524), and the SAGA light source with the approval of the Kyushu Synchrotron Light Research center (Proposal No. 1601153P).
Publisher Copyright:
© 2016 The Japan Society of Applied Physics.
PY - 2016/7
Y1 - 2016/7
N2 - From measuring absorption spectra of cerium-doped Gd3Al2Ga3O12 (Ce:GAGG) and undoped GAGG crystals at low temperatures under UV-light irradiation, we find that they exhibit a broad band at around 12000 cm%1. This band is enhanced by high-temperature annealing under a hydrogen atmosphere. On the basis of present experimental results, the UV-induced band is assigned to shallow electron traps of defect complexes associated with oxygen vacancies. The UV-induced band completely disappears with Mg2+ codoping. We conclude that the Mg2+ codoping has the effect of inhibiting the formation of shallow electron traps, which realizes a faster scintillation response of Ce:GAGG.
AB - From measuring absorption spectra of cerium-doped Gd3Al2Ga3O12 (Ce:GAGG) and undoped GAGG crystals at low temperatures under UV-light irradiation, we find that they exhibit a broad band at around 12000 cm%1. This band is enhanced by high-temperature annealing under a hydrogen atmosphere. On the basis of present experimental results, the UV-induced band is assigned to shallow electron traps of defect complexes associated with oxygen vacancies. The UV-induced band completely disappears with Mg2+ codoping. We conclude that the Mg2+ codoping has the effect of inhibiting the formation of shallow electron traps, which realizes a faster scintillation response of Ce:GAGG.
UR - http://www.scopus.com/inward/record.url?scp=84978417816&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84978417816&partnerID=8YFLogxK
U2 - 10.7567/APEX.9.072602
DO - 10.7567/APEX.9.072602
M3 - Article
AN - SCOPUS:84978417816
SN - 1882-0778
VL - 9
JO - Applied Physics Express
JF - Applied Physics Express
IS - 7
M1 - 072602
ER -