Fluorescence dynamics in 1D systems with phonon-assisted energy transfer
Küçük Resim Yok
Tarih
1999
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier Science Bv
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
We report the results of a theoretical study of fluorescence dynamics in quasi-one-dimensional systems with phonon-assisted energy transfer between nearest neighbors. It is assumed that the phonons are three-dimensional, the one-phonon mechanism is dominant and the wavelength of the phonon involved is long in comparison with the separation between nearest neighbors. A combination of analytical and numerical techniques is used in the analysis of the decay of the narrow-line component observed in fluorescence line narrowing studies. A random distribution of single-ion transition frequencies is postulated, with no correlation between sites, and the variance of the distribution is taken to be small in comparison with (kT/(h) over bar)(2). It is found that the narrow-line fluorescence decays asymptotically as t(-1/3) rather than as t(-1/2). as would be the case if the energy transfer were diffusive at long times. It is shown that the subdiffusive dynamics reflects a singular behavior in the limiting form of the distribution of transfer rates that is not present when the energy transfer involves two-phonon processes. Numerical results are presented for the early stages of the decay for rectangular distributions of transition frequencies with various values of the ratio of kT/(h) over bar sigma, where sigma(2) is the variance of the distribution. (C) 1999 Elsevier Science B.V. All rights reserved.
Açıklama
12th International Conference on Dynamical Proceesses in Excited States of Solids (DPC 99) -- MAY 23-27, 1999 -- HUMACAO, PUERTO RICO
Anahtar Kelimeler
energy transfer, fluorescence, one dimension
Kaynak
Journal of Luminescence
WoS Q Değeri
Q3
Scopus Q Değeri
Cilt
83-4
