Počet záznamů: 1  

Role of non-stoichiometry and Mg-codoping on LuAG:Ce and LuGAG:Ce luminescence and scintillation properties

  1. 1.
    0521884 - FZÚ 2020 PL eng A - Abstrakt
    Pejchal, Jan - Bárta, Jan - Babin, Vladimir - Beitlerová, Alena - Průša, Petr - Kučerková, Romana - Pánek, D. - Parkman, T. - Guguschev, C. - Havlák, Lubomír - Zemenová, Petra - Kamada, K. - Yoshikawa, A.
    Role of non-stoichiometry and Mg-codoping on LuAG:Ce and LuGAG:Ce luminescence and scintillation properties.
    Proceedings of the international symposium on optical materials (ISOM08). Wrocław: University of Wroclaw, 2019 - (Guzik, M.; Cybińska, J.). ISBN 978-83-60043-36-3.
    [International Symposium on Optical Materials (ISOM08) /8./. 09.06.2019-14.06.2019, Wroclaw]
    Institucionální podpora: RVO:68378271
    Klíčová slova: garnet * scintillator * codoping * stoichiometry
    Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)

    This study focused on the influence of Mg codoping and non-stoichiometry on the scintillation and luminescence characteristics of Ce-doped lutetium aluminum garnet crystals (LuAG) and Ga-admixed analogues (LuGAG). For the Ce-doped LuAG samples, codoping of Mg at a concentration around 300 ppm led to improvement of overall scintillation efficiency, which is in accordance with previous studies and can be attributed to an alternative scintillation mechanism involving Ce4+ stabilized by Mg2+. Very significant improvement of the overall scintillation efficiency (almost a factor of 2) and exceptionally high light yield when compared to the stoichiometric sample was observed for the Ce0.2% Mg 300 ppm sample grown from the melt with Al-rich non-stoichiometry. This was explained by an enhanced energy transfer towards the Ce3+ luminescence center via a defect related to an oxygen vacancy and stabilized/distorted by the non-stoichiometry.

    Trvalý link: http://hdl.handle.net/11104/0306433

     
     
Počet záznamů: 1  

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