Defect engineering in Ce-doped aluminum garnet single crystal scintillators

Martin Nikl, Kei Kamada, Vladimir Babin, Jan Pejchal, Katerina Pilarova, Eva Mihokova, Alena Beitlerova, Karol Bartosiewicz, Shunsuke Kurosawa, Akira Yoshikawa

Research output: Contribution to journalArticlepeer-review

199 Citations (Scopus)


Mg-codoped Lu3Al5O12:Ce single crystal scintillators were prepared by a micropulling down method in a wide concentration range from 0 to 3000 ppm of Mg codopant. Their structure and chemical composition were checked by X-ray diffraction and electron probe microanalysis techniques. Absorption and luminescence spectra, photoluminescence decays, and thermoluminescence glow curves were measured together with several other scintillation characteristics, namely, the scintillation decay, light yield, afterglow, and radiation damage to reveal the effect of Mg codoping. Several material characteristics manifest a beneficial effect of Mg codopant. We propose a model explaining the mechanism of material improvement which is based on the stabilization of a part of the cerium dopant in the tetravalent charge state. The stable Ce4+ center provides an additional fast radiative recombination pathway in the scintillation mechanism and efficiently competes with electron traps in garnet scintillators.

Original languageEnglish
Pages (from-to)4827-4833
Number of pages7
JournalCrystal Growth and Design
Issue number9
Publication statusPublished - 2014 Sept 3


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