Competing radiative and nonradiative decay of embedded ions states in dielectric crystals: theory, and application to Co2+:AgCl0.5Br0.5

A. Shirakov, Z. Burshtein, A. Katzir, E. Frumker, A. A. Ishaaya

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Abstract

We present a generally applicable theoretical model describing excited-state decay lifetime analysis of metal ions in a host crystal matrix. In contrast to common practice, we include multi-phonon non-radiative transitions competitively to the radiative one. We have applied our theory to Co2+ ions in a mixed AgCl0.5Br0.5 crystal, and as opposed to a previous analysis, find excellent agreement between theory and experiment over the entire measured temperature range. The fit predicts a zero absolute temperature radiative lifetime τr ad(0) = 5.5 ms, more than three times longer than the measured e ective low-temperature one τe ff (0) = 1.48 ms. Furthermore, the fit configuration potential dissociation energy has been estimated as D = 2500 cm−1 and the lattice vibrational cuto frequency as ωco = 180 cm−1. We have experimentally verified the latter by optical reflection measurement in the far-IR.

Original languageEnglish
Pages (from-to)11694-11707
Number of pages14
JournalOptics Express
Volume26
Issue number9
DOIs
StatePublished - 30 Apr 2018

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