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Title: Radiative decay of polaron-excitons in poly(phenylene vinylene)

Abstract

Starting from a nondegenerate-ground-state Su-Schrieffer-Heeger-like model Hamiltonian for poly(phenylene vinylene) we study the effect of electron-lattice coupling on the radiative recombination of polaron-excitons, using a lattice relaxation theory which explicitly takes into account multimode effects. We provide a detailed microscopic description of the decay process with emphasis on the fact that the phonon modes of the excited state---the polaron-exciton---are different from the ground-state phonon modes. We find that at zero temperature all accepting modes are within an almost dispersionless ground-state phonon branch. Therefore, as long as the polaron-exciton is in its vibrational ground state a simple, empirical, single-mode description of the recombination (photoluminescence) is feasible. However, the complicated phonon structure of the polaron-exciton---including localized as well as extended modes---renders an Einstein desciption of promoting modes meaningless. We thus expect that in processes where promoting modes are involved a single-mode model breaks down.

Authors:
; ;  [1]
  1. Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
5967068
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter; (United States)
Additional Journal Information:
Journal Volume: 48:17; Journal ID: ISSN 0163-1829
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; POLARONS; RADIATIVE DECAY; POLYMERS; EXCITONS; PHENYL RADICALS; PHONONS; RECOMBINATION; SINGLE-PARTICLE MODES; ARYL RADICALS; DECAY; OSCILLATION MODES; PARTICLE DECAY; QUASI PARTICLES; RADICALS; 665430* - Other Topics in Quantum Fluids & Solids- (1992-)

Citation Formats

Bronold, F X, Saxena, A, and Bishop, A R. Radiative decay of polaron-excitons in poly(phenylene vinylene). United States: N. p., 1993. Web. doi:10.1103/PhysRevB.48.13162.
Bronold, F X, Saxena, A, & Bishop, A R. Radiative decay of polaron-excitons in poly(phenylene vinylene). United States. https://doi.org/10.1103/PhysRevB.48.13162
Bronold, F X, Saxena, A, and Bishop, A R. 1993. "Radiative decay of polaron-excitons in poly(phenylene vinylene)". United States. https://doi.org/10.1103/PhysRevB.48.13162.
@article{osti_5967068,
title = {Radiative decay of polaron-excitons in poly(phenylene vinylene)},
author = {Bronold, F X and Saxena, A and Bishop, A R},
abstractNote = {Starting from a nondegenerate-ground-state Su-Schrieffer-Heeger-like model Hamiltonian for poly(phenylene vinylene) we study the effect of electron-lattice coupling on the radiative recombination of polaron-excitons, using a lattice relaxation theory which explicitly takes into account multimode effects. We provide a detailed microscopic description of the decay process with emphasis on the fact that the phonon modes of the excited state---the polaron-exciton---are different from the ground-state phonon modes. We find that at zero temperature all accepting modes are within an almost dispersionless ground-state phonon branch. Therefore, as long as the polaron-exciton is in its vibrational ground state a simple, empirical, single-mode description of the recombination (photoluminescence) is feasible. However, the complicated phonon structure of the polaron-exciton---including localized as well as extended modes---renders an Einstein desciption of promoting modes meaningless. We thus expect that in processes where promoting modes are involved a single-mode model breaks down.},
doi = {10.1103/PhysRevB.48.13162},
url = {https://www.osti.gov/biblio/5967068}, journal = {Physical Review, B: Condensed Matter; (United States)},
issn = {0163-1829},
number = ,
volume = 48:17,
place = {United States},
year = {1993},
month = {11}
}