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Decay kinetics of the triplet luminescence from self‐trapped excitons in CdMoO 4 and ZnWO 4
Author(s) -
Itoh Minoru,
Kajitani Takushi
Publication year - 2011
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201000666
Subject(s) - excited state , luminescence , exciton , atomic physics , excitation , exponential decay , kinetics , ground state , atmospheric temperature range , range (aeronautics) , materials science , physics , condensed matter physics , optoelectronics , nuclear physics , thermodynamics , quantum mechanics , composite material
Decay kinetics of the intrinsic luminescence from the triplet excited state of self‐trapped excitons in CdMoO 4 and ZnWO 4 has been investigated in a wide temperature range between 7 and 300 K. The measurements are carried out under low‐density excitation with the fourth harmonics (266 nm) of a Nd:YAG laser. The decay curves show two decay components, fast and slow, at T < 40 K in CdMoO 4 and at T < 15 K in ZnWO 4 . At higher temperatures, the decay curves in both materials are well described by single‐exponential functions. A three‐level model consisting of two excited states separated by an energy D and a ground state is applied to explain the temperature dependences of fast and slow decay times. From the fit to the experimental data, we obtain D = 3.7 ± 0.5 meV for CdMoO 4 and 2.1 ± 0.3 meV for ZnWO 4 .