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Delayed recombination and excited state ionization of the Ce 3+ activator in the SrHfO 3 host
Author(s) -
Mihóková Eva,
Jarý Vítězslav,
Schulman Lawrence S.,
Nikl Martin
Publication year - 2013
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201206499
Subject(s) - excited state , recombination , ionization , luminescence , activator (genetics) , atomic physics , scintillation , excitation , ionization energy , microcrystalline , materials science , chemistry , physics , optoelectronics , ion , optics , crystallography , biochemistry , organic chemistry , quantum mechanics , detector , gene
We determine the thermal ionization energy of the excited state of Ce 3+ in a SrHfO 3 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)