[22a-12E-1~10] 2.1 Detection Devices

9:15 AM - 9:30 AM JST(12:15 AM - 12:30 AM UTC)

[22a-12E-1] Crystal Growth and Optical Properties of Ce-doped (Y, Tb)₃ Al₂Ga₃O₁₂ and (Gd, Tb)₃ Al₂Ga₃O₁₂ Scintillators

〇(M1)Kazuya Omuro^1,2, Masao Yoshino^2,3, Kei Kamada^2,3,4, Kyoung Jin Kim², Takahiko Horiai^2,3, Rikito Murakami², Akihiro Yamaji^2,3, Takashi Hanada², Yuui Yokota², Shunsuke Kurosawa^2,3,5, Yuji Ohashi^2,3, Hiroki Sato^2,3, Akira Yoshikawa^2,3,4 (1.Grad. Sch. Eng., Tohoku Univ., 2.IMR, Tohoku Univ., 3.NICHe, Tohoku Univ., 4.C&A Corp., 5.ILE, Osaka Univ.)

Keywords:

X-ray imaging,scintillator,ternary garnet oxide

Scintillators are widely used in X-ray imaging, which are applied for medical diagnostics and airport security controls. To obtain images with excellent contrast in short exposure times, scintillators are required to have the high light output. Therefore, Tb-doped scintillators are noble candidate for X-ray imaging. Recently, Ce and Tb co-doped scintillators such as Ce-doped (Gd, Tb)₃(Al, Ga)₅O₁₂ (GAGG:Ce,Tb) have been explored due to efficient energy transfer between Ce³⁺ and Tb³⁺, which enable to improve the luminescence and scintillation properties. However, the absorption spectra of GAGG show the peaks associated with Gd³⁺ 4f-4f transitions which overlap the absorption bands associated with Tb³⁺ 4f-5d transitions. As a consequence, the presence of Gd in the host material introduces complexity to the behavior of energy transfer between Ce³⁺ and Tb³⁺. In this study, we investigated the specific influence of Gd within the host material on the energy transfer between Ce³⁺ and Tb³⁺.