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Heavily Ce3+ -doped Y3Al5O12 thin films deposited by a polymer sol-gel method for fast scintillation detectors

Abstract

The performance of cerium-doped Y3Al5O12 (Ce3+:YAG) often depends on cerium solubility achievable in a particular preparation technology. This solubility is kinetically affected by the synthesis process which allows for Ce3+ solubility to be generally much higher in a polycrystalline material than in single crystals. This work presents Y3-xCexAl5O12 polycrystalline thin films deposited by spin-coating where cerium is substituted on yttrium sites in an interval of 3.3-25 at.%. Up to a concentration of 18 at.%, the samples remain single-phase, which is the highest Ce3+ doping level in YAG published so far. Absorption, excitation and emission photoluminescent spectra are presented. The photoluminescence decays of the samples containing up to 6 at.% of cerium are comparable in radiative lifetime to Ce3+:YAG single crystals having the cerium concentration limit over one order smaller. The cathodoluminescence of samples and soft X-ray nanosecond pulse-excited decays is examined. The scintillation decays appear much faster with 1/e decay time well below 10 ns compared to a Ce3+:YAG single crystal which shows 140 ns. After further optimization of microstructure and overall scintillation yield, the sol-gel prepared Ce3+:YAG thin films are promising candidates for the application in fast SEM scintillation detectors, currently intensively prospected R&D in the scintillator technology field.

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Publication details

The article was received on 31 May 2019, accepted on 12 Jul 2019 and first published on 12 Jul 2019


Article type: Paper
DOI: 10.1039/C9CE00842J
CrystEngComm, 2019, Accepted Manuscript

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    Heavily Ce3+ -doped Y3Al5O12 thin films deposited by a polymer sol-gel method for fast scintillation detectors

    M. Nikl, K. Rubesova, J. Havlicek, V. Jakes, L. Nadherny, J. Cajzl, D. Panek, T. Parkman, A. Beitlerová, R. Kucerkova and F. Hájek, CrystEngComm, 2019, Accepted Manuscript , DOI: 10.1039/C9CE00842J

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