Excitation energy dependence for electron traps in CaTiO3:Pr, Al single crystals. (May 2019)

• Record Type: Journal Article
• Authors: Nanai, Y; Igarashi, A; Kamioka, H
• Is Part Of: Journal of physics. Volume 1220(2019)
• Publication Date: 2019-05
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/1220/1/012011
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: We investigated the red afterglow process of CaTiO3 :Pr, Al through photoluminescence and thermoluminescence measurements by using fabricated single crystals. The crystals with several cubic millimeter in size were obtained through a flux method. We found that the afterglow properties varied with the excitation energy. At room temperature, the red afterglow was observed for the charge transfer from Pr 3+ to Ti 4+ excitation and the direct excitation of Pr 3+, while not observed for the interband excitation of CaTiO3 due to the relaxation process going through 4d 1 5d 1 state of Pr 3+ . For the direct excitation of Pr 3+ at 80 K, the excited electrons did not reached to trap states for afterglow due to a potential barrier, which can overcome with thermal assistance at room temperature. For the charge transfer excitation at 80 K, the excited electrons could reach the traps with excess energy.