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Titolo:
Theory and numerical study of exciton dynamics in a disordered linear chain
Autore:
Shimizu, M; Suto, S; Goto, T;
Indirizzi:
Tohoku Univ, Grad Sch Sci, Dept Phys, Sendai, Miyagi 9808578, Japan TohokuUniv Sendai Miyagi Japan 9808578 ys, Sendai, Miyagi 9808578, Japan
Titolo Testata:
JOURNAL OF CHEMICAL PHYSICS
fascicolo: 6, volume: 114, anno: 2001,
pagine: 2775 - 2783
SICI:
0021-9606(20010208)114:6<2775:TANSOE>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
SITE-SELECTIVE FLUORESCENCE; CONJUGATED POLYMERS; GAUSSIAN DISTRIBUTION; OPTICAL-PROPERTIES; POLY(DI-N-HEXYLSILANE); SPECTROSCOPY; SPECTRA; POLY(DI-NORMAL-HEXYLSILANE); ELECTROLUMINESCENCE; EXCITATIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Shimizu, M RIKEN, Inst Phys & Chem Res, Wako, Saitama 3510198, Japan RIKEN Wako Saitama Japan 3510198 Wako, Saitama 3510198, Japan
Citazione:
M. Shimizu et al., "Theory and numerical study of exciton dynamics in a disordered linear chain", J CHEM PHYS, 114(6), 2001, pp. 2775-2783

Abstract

We have formulated the exciton dynamics in a disordered linear chain with exciton wave functions given by the one-dimensional Frenkel exciton Hamiltonian with disorder. It is assumed that exciton-phonon coupling is weak and that the dynamics is governed by the competing processes of phonon scattering and radiative decay. The phonon scattering rate is given on the assumption that excitons do not change the site by the scattering. The strength of exciton-phonon coupling and the density of phonon states are independent ofenergy. The radiative decay rate is given by the Einstein's A coefficient. The detail of the numerical procedure is also described. Absorption spectra, luminescence spectra, the time response of luminescence intensity, and temperature dependence are calculated for the model system of poly(di-n-hexylsilane) film. It is discussed that long-range dipole-dipole interaction isresponsible for the luminescence depolarization. (C) 2001 American Institute of Physics.

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Documento generato il 01/12/20 alle ore 13:39:31