Coherent one-dimensional exciton transport and impurity scattering

Dana D Dlott, M. D. Fayer, R. D. Wieting

Research output: Contribution to journalArticle

Abstract

A model is developed which describes the transport of coherent one-dimensional excitons in molecular crystals containing a low concentration impurity having excited state energy above that of the host crystal's exciton band. An expression is obtained for the exciton mean-square displacement and the exciton flux. The model is then employed to determine the effect of impurity scattering on an experimental observable, the time dependence of trap emission after impulse optical excitation of a one-dimensional exciton system. The resulting formula is used to calculate, without adjustable parameters, the time-dependent intensity of phosphorescent trap emission from crystals of 1,2,4,5-tetrachlorobenzene (TCB) containing the naturally occurring scattering impurity, hd-TCB, at 1.25°K. The results are compared to experiment and found to be in good agreement. Although the question remains open, the results are consistent with a coherent mode of triplet exciton transport in TCB and indicate the importance of naturally occurring isotopic impurity scattering in this type of system.

Original languageEnglish (US)
Pages (from-to)3808-3817
Number of pages10
JournalThe Journal of Chemical Physics
Volume67
Issue number8
DOIs
StatePublished - Jan 1 1977

Fingerprint

excitons
Scattering
Impurities
impurities
scattering
traps
crystals
Molecular crystals
Crystals
Photoexcitation
Excited states
excitation
time dependence
LDS 751
impulses
low concentrations
Fluxes
Experiments
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Coherent one-dimensional exciton transport and impurity scattering. / Dlott, Dana D; Fayer, M. D.; Wieting, R. D.

In: The Journal of Chemical Physics, Vol. 67, No. 8, 01.01.1977, p. 3808-3817.

Research output: Contribution to journalArticle

Dlott, Dana D ; Fayer, M. D. ; Wieting, R. D. / Coherent one-dimensional exciton transport and impurity scattering. In: The Journal of Chemical Physics. 1977 ; Vol. 67, No. 8. pp. 3808-3817.
@article{2d717cdd74434857ad18f455961e5807,
title = "Coherent one-dimensional exciton transport and impurity scattering",
abstract = "A model is developed which describes the transport of coherent one-dimensional excitons in molecular crystals containing a low concentration impurity having excited state energy above that of the host crystal's exciton band. An expression is obtained for the exciton mean-square displacement and the exciton flux. The model is then employed to determine the effect of impurity scattering on an experimental observable, the time dependence of trap emission after impulse optical excitation of a one-dimensional exciton system. The resulting formula is used to calculate, without adjustable parameters, the time-dependent intensity of phosphorescent trap emission from crystals of 1,2,4,5-tetrachlorobenzene (TCB) containing the naturally occurring scattering impurity, hd-TCB, at 1.25°K. The results are compared to experiment and found to be in good agreement. Although the question remains open, the results are consistent with a coherent mode of triplet exciton transport in TCB and indicate the importance of naturally occurring isotopic impurity scattering in this type of system.",
author = "Dlott, {Dana D} and Fayer, {M. D.} and Wieting, {R. D.}",
year = "1977",
month = "1",
day = "1",
doi = "10.1063/1.435323",
language = "English (US)",
volume = "67",
pages = "3808--3817",
journal = "Journal of Chemical Physics",
issn = "0021-9606",
publisher = "American Institute of Physics Publising LLC",
number = "8",

}

TY - JOUR

T1 - Coherent one-dimensional exciton transport and impurity scattering

AU - Dlott, Dana D

AU - Fayer, M. D.

AU - Wieting, R. D.

PY - 1977/1/1

Y1 - 1977/1/1

N2 - A model is developed which describes the transport of coherent one-dimensional excitons in molecular crystals containing a low concentration impurity having excited state energy above that of the host crystal's exciton band. An expression is obtained for the exciton mean-square displacement and the exciton flux. The model is then employed to determine the effect of impurity scattering on an experimental observable, the time dependence of trap emission after impulse optical excitation of a one-dimensional exciton system. The resulting formula is used to calculate, without adjustable parameters, the time-dependent intensity of phosphorescent trap emission from crystals of 1,2,4,5-tetrachlorobenzene (TCB) containing the naturally occurring scattering impurity, hd-TCB, at 1.25°K. The results are compared to experiment and found to be in good agreement. Although the question remains open, the results are consistent with a coherent mode of triplet exciton transport in TCB and indicate the importance of naturally occurring isotopic impurity scattering in this type of system.

AB - A model is developed which describes the transport of coherent one-dimensional excitons in molecular crystals containing a low concentration impurity having excited state energy above that of the host crystal's exciton band. An expression is obtained for the exciton mean-square displacement and the exciton flux. The model is then employed to determine the effect of impurity scattering on an experimental observable, the time dependence of trap emission after impulse optical excitation of a one-dimensional exciton system. The resulting formula is used to calculate, without adjustable parameters, the time-dependent intensity of phosphorescent trap emission from crystals of 1,2,4,5-tetrachlorobenzene (TCB) containing the naturally occurring scattering impurity, hd-TCB, at 1.25°K. The results are compared to experiment and found to be in good agreement. Although the question remains open, the results are consistent with a coherent mode of triplet exciton transport in TCB and indicate the importance of naturally occurring isotopic impurity scattering in this type of system.

UR - http://www.scopus.com/inward/record.url?scp=0001503596&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0001503596&partnerID=8YFLogxK

U2 - 10.1063/1.435323

DO - 10.1063/1.435323

M3 - Article

AN - SCOPUS:0001503596

VL - 67

SP - 3808

EP - 3817

JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

SN - 0021-9606

IS - 8

ER -