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

• Published in: physica status solidi (b) Vol. 257; no. 8
• Main Authors: Yoshino, Masao, Bartosiewicz, Karol, Horiai, Takahiko, Kamada, Kei, Yamaji, Akihiro, Shoji, Yasuhiro, Yokota, Yuui, Kurosawa, Shunsuke, Ohashi, Yuji, Sato, Hiroki, Toyoda, Satoshi, Kucerkova, Romana, Jary, Vitezslav, Nikl, Martin, Yoshikawa, Akira
• Format: Journal Article
• Language: English
• Published: 01-08-2020
• Subjects: concentration effects; Gd3(Ga, Al)5O12; Li codoping; scintillators; single crystals
• ISSN: 0370-1972; 1521-3951
• DOI: 10.1002/pssb.201900504

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.
The characteristics of luminescence and temperature dependence of photoluminescence (PL) decay are investigated. The conversion of the stable Ce3+ to Ce4+ is not observed in a clear manner in GGAG:Ce samples with variable Li concentration. Measurements of the temperature dependence of PL decay show that a downward shift of luminescence quenching temperature occurs for GGAG containing more than 0.2% Ce.