Visualizing hidden electron trap levels in Gd3Al2Ga3O12:Ce crystals using a mid-infrared free-electron laser

Mamoru Kitaura, Heishun Zen, Kei Kamada, Shunsuke Kurosawa, Shinta Watanabe, Akimasa Ohnishi, Kazuhiko Hara

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3 Citations (Scopus)

Abstract

The energy levels of electron traps (namely, defect complexes associated with oxygen vacancies) in Gd3Al2Ga3O12:Ce (GAGG:Ce) were studied at 12 K using mid-infrared (MIR) light pulses from a free-electron laser (FEL) as the probe light. Ce3+ 5d-4f luminescence was stimulated by the MIR light pulse following an ultraviolet light pulse. Stimulation of Ce3+ 5d-4f luminescence by MIR light pulses was pronounced above 0.31 eV. This result is consistent with that of previous work based on a trap-mediated luminescence model. It is concluded that the electron trap levels are located 0.31 eV below the bottom of the conduction band. This study demonstrates that MIR-FEL is applicable for the determination of hidden electron trap levels.

Original languageEnglish
Article number031112
JournalApplied Physics Letters
Volume112
Issue number3
DOIs
Publication statusPublished - 2018 Jan 15

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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