Luminescence and scintillation characteristics of (GdxY3-x)Al2Ga3O12:Ce (x = 1,2,3) single crystals
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Author list: Chewpraditkul W., Pattanaboonmee N., Sakthong O., Chewpraditkul W., Szczesniak T., Moszynski M., Kamada K., Yoshikawa A., Nikl M.
Publisher: Elsevier
Publication year: 2018
Journal: Optical Materials (0925-3467)
Volume number: 76
Start page: 162
End page: 168
Number of pages: 7
ISSN: 0925-3467
eISSN: 1873-1252
Languages: English-Great Britain (EN-GB)
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Abstract
The luminescence and scintillation characteristics of Czochralski-grown (GdxY3-x)Al2Ga3O12:Ce (x = 1,2,3) single crystals are presented. With increasing Gd content in this garnet host, the 5d2 absorption band was blue-shifted while the 5d1 absorption and 5d1 → 4f emission bands were red-shifted due to an increase in the crystal field splitting of the 5d levels. In addition, the luminescence quenching temperature of the Ce3+emission and activation energy for thermal quenching decreased with increasing Gd content. The Gd3+ → Ce3+ energy transfer was evidenced by photoluminescence excitation spectra of Ce3+ emission. At 662 keV γ - rays, the light yield (LY) of 48,600 ph/MeV and energy resolution of 6.5% was measured for a Gd3Al2Ga3O12:Ce crystal. Scintillation decay measurements were performed using the time-correlated single photon counting technique. Superior time resolution of Gd3Al2Ga3O12:Ce is due to its high LY and fast scintillation response. The total mass attenuation coefficients at 60 and 662 keV γ - rays were also determined. © 2017 Elsevier B.V.
Keywords
(Gd,Y)3Al2Ga3O12:Ce
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