FREE CARRIERS DYNAMICS IN HEAVY SCINTILLATION MATERIALS WITH GARNET STRUCTURE
Abstract
Ce-doped Lu3 Al5 O12 (LuAG), and Gd3 Al2 Ga3 O12 (GAGG) crystals with and without codoping by Mg2+ ions have been studied by the nonlinear absorption spectroscopy method. A faster rise time of transient optical absorption has been observed in all crystals codoped with Mg in comparison to Mg-free samples. A significant difference in the time evolution of the differential optical density in GAGG in comparison to LuAG crystals is revealed. in gadolinium garnets an absorption band peaked in the blue-green range and decaying with characteristic time of ~2 ps is observed. This band is considered to be due to absorption of free electrons before their trapping by Ce3+doping ions. A broad transient absorption band in the yellowred region is attributed to absorption from the Ce3+ excited states.
Supporting agencies: This work was supported by COST Action TD1401 “Fast Advanced Scintillator Timing (FAST)” and MSC RICE INTELUM Project and the Belarus Foundation for Fundamental Research.
About the Authors
S. A. Tikhomirov
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
D. Sc. (Physics and Mathematics), Corresponding Member, Head of the Laboratory of Physics of Infrared Rays
68, Nezavisimosti Ave., 220072, Minsk
M. Lucchini
CERN
Switzerland
Switzerland
Ph. D. (Physics and Mathematics), staff
1123 Geneva
O. V. Buganov
B. I. Stepanov Institute of Physics of the National Academy of Sciences of Belarus
Belarus
Belarus
Ph. D. (Physics and Mathematics), Deputy Head of the Laboratory of Physics of Infrared Rays
68, Nezavisimosti Ave., 220072, Minsk
E. Auffray
CERN
Switzerland
Switzerland
Ph. D. (Physics and Mathematics), staff
1123 Geneva
M. V. Korjik
Institute for Nuclear Problems of the Belarusian State University
Belarus
Belarus
D. Sc. (Physics and Mathematics), Head of the Laboratory of Experimental High Energy Physics
11, Bobruiskaya Str., 220030, Minsk
D. Kozlov
Institute for Nuclear Problems of the Belarusian State University
Belarus
Belarus
Postgraduate
11, Bobruiskaya, 220030, Minsk
S. Nargelas
Vilnius University
Lithuania
Lithuania
Research Worker
Sauletekioal. – III, Vilnius
G. Tamulaitis
Vilnius University
Lithuania
Lithuania
D. Sc. (Physics and Mathematics), Professor, Head of the Department
Sauletekioal. – III, Vilnius
A. Vaitkevičius
Vilnius University
Lithuania
Lithuania
Ph. D. Student
Sauletekioal. – III, Vilnius
Akira Yoshikava
Tohoky University
Japan
Professor
Japan
Professor
References
1. Gundacker S., Auffray E., Pauwels K., Lecoq P. Measurement of intrinsic rise times for various LYSO and LuAG scintillators with a general study 430 of prompt photons to achieve 10 ps in TOF-PET. Physics in Medicine and Biology, 2016, vol. 61, no. 7, pp. 2802–2837. Doi: 10.1088/0031-9155/61/7/2802
2. Kamada K., Endo T., Tsutumi K., Yanagida T., Fujimoto Y., Fukabori A., Yoshikawa, Pejchal A. J., Nikl M. Composition Engineering in Cerium-Doped (Lu,Gd)3 (Ga,Al)5 O12 Single-Crystal Scintillators. Crystal Growth and Design, 2011, vol. 11, no. 10, pp. 4484–4490. Doi: 10.1021/cg200694a
3. Kamada K., Yanagida T., Pejchal J., Nikl M., Endo T., Tsutsumi K., Fujimoto Y., Fukabori A., Yoshikawa A. Crystal Growth and Scintillation Properties of Ce Doped rmGd3 (rmGa,rmAl)5 rmO12 Single Crystals. IEEE Transactions on Nuclear Science, 2012, vol. 59, no. 5, pp. 2112–2115. Doi: 10.1109/tns.2012.2197024
4. Yadav S. K., Uberuaga B. P., Nikl M., Jiang C., Stanek C. R.. Band-Gap and Band-Edge Engineering of Multicomponent Garnet Scintillators from First Principles. Physical Review Applied, 2015, vol. 4, no. 5, pp. 054012. Doi: 1103/phys revapplied.4.054012
5. Fasoli M., Vedda A., Nikl M., Jiang C., Uberuaga B. P., Andersson D. A., McClellan K. J., Stanek C. R. Band-gap engineering for removing shallow traps in rare-earth Lu3 Al5 O12 garnet scintillators using Ga3+ doping. Physical Review B, 2011, vol. 84, no. 8, p. 081102. Doi: 10.1103/physrevb.84.081102
6. Auffray E., Augulis R., Borisevich A., Gulbinas V., Fedorov A., Korjik M., Lucchini M. T., Mechinsky V., Nargelas S., Songaila E., Tamulaitis G., Vaitkevičius A., Zazubovich S. Luminescence rise time in self-activated PbWO4 and Ce-doped Gd3 Al2 Ga3 O12 scintillation crystals. Journal of Luminescence, 2016, vol. 178, pp. 54–60. Doi: 10.1016/j.jlumin.2016.05.015
7. Lucchini M., Gundacker S., Lecoq P., Benaglia A., Nikl M., Kamada K., Yoshikawa A., Auffray E. Timing capabilities of garnet crystals for detection of high energy charged particles. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2017, vol. 852, pp. 1–9. Doi: 10.1016/j.nima. 2017.02.008
8. Lucchini M., Babin V., Bohacek P., Gundacker S., Kamada K., Nikl M., Petrosyan A., Yoshikawa A., Auffray E. Effect of Mg2+ ions co-doping on timing performance and radiation tolerance of Cerium doped Gd3 Al2 Ga3 O12 crystals. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2016, vol. 816, pp. 176–183. Doi: 10.1016/j.nima.2016.02.004
9. Auffray E., Korjik M., Lucchini M. T., Nargelas S., Sidletskiy O., Tamulaitis G., Yratsiak Y. T., Vaitkevičius A. Free carriers absorption in self-activated PbWO4 and Ce-doped Y3 (Al0.25Ga0.75) 3 )O12, and Gd3 Al2Ga3 O12 garnet scintillators. Optical Materials, 2016, vol. 58, pp. 461–465. Doi: 10.1016/j.optmat.2016.06.040
10. Tamulaitis G., Vaitkevičius A., Nargelas S., Augulis R., Gulbinas V., Bohacek P., Nikl M., Borisevich A., Fedorov A., Korjik M., Auffray E. Subpicosecond luminescence rise time in magnesium codoped GAGG:Ce scintillator. Nuclear Instrum ents and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2017, vol. 870, pp. 25–29. Doi: 10.1016/j.nima.2017.07.015
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