Cathodoluminescence study of LuAG:Ce,Mg and LuGAGG:Ce,Mg single crystalline films – Mg-rich extension

0495545 - ÚPT 2019 CZ eng A - Abstrakt
Lalinský, Ondřej - Schauer, Petr - Rathaiah, M. - Kučera, M.
Cathodoluminescence study of LuAG:Ce,Mg and LuGAGG:Ce,Mg single crystalline films – Mg-rich extension.
10th International Conference on Luminescent Detectors and Transformers of Ionizing Radiation. Book of Abstracts. Praha: Czech Technical University in Prague, 2018. s. 208. ISBN 978-80-01-06479-5.
[International Conference on Luminescent Detectors and Transformers of Ionizing Radiation /10./. 09.09.2018-14.09.2018, Prague]
Institucionální podpora: RVO:68081731
Klíčová slova: cathodoluminescence * single crystalline films
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

Cerium activated lutetium aluminum garnet (LuAG:Ce) is a promising material for applications
in detectors of ionizing radiation. 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+ centers 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+ centers are really participating in Ce3+ emission. To verify this idea, Mg-rich LuAG:Ce,Mg and LuGAGG:Ce,Mg single crystalline films were prepared. They were grown by the liquid phase epitaxy on bulk single
crystal LuAG substrates.
Trvalý link: http://hdl.handle.net/11104/0288503