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Stable Ce4+ centres - a tool to optimize cathodoluminescence performance in garnet scintillators
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SYSNO ASEP 0494366 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Stable Ce4+ centres - a tool to optimize cathodoluminescence performance in garnet scintillators Author(s) Lalinský, Ondřej (UPT-D) RID, ORCID, SAI
Schauer, Petr (UPT-D) RID, SAI, ORCID
Rathaiah, M. (CZ)
Kučera, M. (CZ)Number of authors 4 Source Title Recent Trends in Charged Particle Optics and Surface Physics Instrumentation. Proceedings of the 16th International Seminar. - Brno : Institute of Scientific Instruments The Czech Academy of Sciences, 2018 - ISBN 978-80-87441-23-7 Pages s. 44-45 Number of pages 2 s. Publication form Print - P Action Recent Trends in Charged Particle Optics and Surface Physics Instrumentation Event date 04.06.2018 - 08.06.2018 VEvent location Skalský dvůr Country CZ - Czech Republic Event type WRD Language eng - English Country CZ - Czech Republic Keywords garnet scintillators ; cathodoluminescence performance Subject RIV JA - Electronics ; Optoelectronics, Electrical Engineering OECD category Electrical and electronic engineering R&D Projects TE01020118 GA TA ČR - Technology Agency of the Czech Republic (TA ČR) GA16-05631S GA ČR - Czech Science Foundation (CSF) LO1212 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) ED0017/01/01 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UPT-D - RVO:68081731 UT WOS 000450591400016 Annotation Garnet single crystals are widely used as scintillators in electron detectors. Cerium activated lutetium aluminum garnet Cex:Lu3-xAl5O12 (LuAG:Ce) is a promising example of such material for these applications. This is mainly due to its high light yield (LY) of 25 kph/MeV, short decay time of 60–80 ns, high atomic density (6.7 g/cm3), and high radiation stability with no hygroscopicity. The cathodoluminescence (CL) performance can be improved by Ga and Gd doping the garnet matrix. Proper admixture of these elements can increase the LY to 50–60 kph/MeV in addition to eliminating unwanted slower decay components. There was an idea that further decay acceleration can be achieved by doping the garnet with monovalent (Li+) or divalent ions (Mg2+, Ca2+). This should increase the valency of some Ce3+ centres to Ce4+ which should better compete with electron traps, and thus accelerate the decay. Our previous work proved the same decay trend, however, at a price of the LY. Such LY loss may induce the idea, if the stable Ce4+ centres are really participating in Ce3+ emission. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2019
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