Delayed recombination and excited state ionization of the Ce3+ activator in the SrHfO3 host |
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| Authors: | Eva Mihóková Vítězslav Jarý Lawrence S Schulman Martin Nikl |
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| Institution: | 1. Institute of Physics, AS CR v.v.i., Cukrovarnická 10, 162 53 Prague, Czech Republic;2. Physics Department, Clarkson University, Potsdam, New York, 13699‐5820, USA |
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| Abstract: | We determine the thermal ionization energy of the excited state of Ce3+ in a SrHfO3 host by a contactless optical method based on the measurement and analysis of delayed recombination decay following UV excitation. We show the applicability of the method for microcrystalline powder samples. The method provides a consistent value of thermal ionization energy of about 0.25 eV, as previously determined by a ther‐ mally stimulated luminescence (TSL) study after UV illumination. We reveal a low temperature contribution to the delayed recombination signal and address its origin. This contribution indicates a complex interaction of the luminescence center with the host lattice neighborhood and the presence of temperature independent losses of fast scintillation light. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) |
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| Keywords: | scintillators thermal ionization oxides tunneling SrHfO3 |
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