Relationship Between Li/Ce Concentration and the Luminescence Properties of Codoped Gd3(Ga, Al)5O12:Ce

Masao Yoshino, Karol Bartosiewicz, Takahiko Horiai, Kei Kamada, Akihiro Yamaji, Yasuhiro Shoji, Yuui Yokota, Shunsuke Kurosawa, Yuji Ohashi, Hiroki Sato, Satoshi Toyoda, Romana Kucerkova, Vitezslav Jary, Martin Nikl, Akira Yoshikawa

Research output: Contribution to journalArticlepeer-review

Abstract

Li+ codoping of Gd3(Ga, Al)5O12:Ce (GGAG:Ce) single crystals induces the acceleration of scintillation decay time. However, its effect on the scintillation properties of GGAG:Ce remains poorly understood. Herein, the relationship between Ce/Li concentration and scintillation properties is investigated. GGAG crystals with a range of Ce and Li concentrations are grown by the Czochralski method and the scintillation decay and light output of GGAG:Ce, Li are measured. The results show comparable or improved performance compared with conventional scintillators. In optical absorption and photoluminescence (PL) measurements, the conversion of the stable Ce3+ to Ce4+ is not observed in a clear manner in GGAG:Ce samples with variable Li concentration. Instead, some defect-related absorption seems to appear. Temperature dependence of PL decay for samples with variable Ce concentration is also evaluated. A shift of the luminescence quenching temperature is observed for GGAG samples with >0.2% Ce.

Original languageEnglish
Article number1900504
JournalPhysica Status Solidi (B) Basic Research
Volume257
Issue number8
DOIs
Publication statusPublished - 2020 Aug 1

Keywords

  • Gd3(Ga, Al)5O12
  • Li codoping
  • concentration effects
  • scintillators
  • single crystals

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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