[21a-S423-1~10] 13.9 Optical properties and light-emitting devices

△ [21a-S423-7] Suppression of Electron Traps in Ce:GAGG Crystals by Mg²⁺ Ion Co-doping

〇(M1)ryota inaba¹, kitaura mamoru², kamada kei³, kurosawa shunsuke³, ohnishi akimasa², hara kazushiko⁴ (1.Yamagata Univ. Graduate School of Science and Engineering, 2.Yamagata Univ. Faculty of Science, 3.Tohoku univ. NICHe., 4.Shizuoka Univ. RIE)

Keywords:scintillater,lattice defects,cerium ion

Infrared absorption spectra of Ce:GAGG crystal and Mg,Ce:GAGG crystal measured at a low temperature under UV-irradiation.
Ce:GAGG crystal are found to exhibit a broad band with a peak at 1.5eV, whereas the band isn’t observed in Ce,Mg:GAGG crystal.
It seems that the broad band is due to electron trap centers, and Mg2+ co-doping suggests that the ions suppresses the formation of trap centers.