A nonlinear optical study of Frenkel excitons in Langmuir-Blodgett films

Jacob Terpstra; Henk Fidder; Douwe A. Wiersma

doi:10.1016/0009-2614(91)85165-S

A nonlinear optical study of Frenkel excitons in Langmuir-Blodgett films

Jacob Terpstra, Henk Fidder, Douwe A. Wiersma

Zernike Institute for Advanced Materials

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Abstract

We report results of a nonlinear optical investigation of the J-band of pseudoisocyanine iodide in a Langmuir-Blodgett film. The spectral narrowing of the fluorescence compared to the absorption spectrum at 77 K is ascribed to exciton relaxation in a disordered band. Resonance Rayleigh scattering and accumulated photon-echo experiments show that the exciton dephasing rate increases rapidly at energies above the renormalized band edge. This effect is linked to a change in localization of the excitons. At 1.5 K, the system’s disorder is found to be larger, which leads to greater localization of the excitons. Monte Carlo calculation of the J-band’s line shape at several temperatures supports the interpretation given.

Original language	English
Pages (from-to)	349-354
Number of pages	6
Journal	Chemical Physics Letters
Volume	179
Issue number	4
DOIs	https://doi.org/10.1016/0009-2614(91)85165-S
Publication status	Published - 26-Apr-1991

Keywords

SUPERRADIANT EMISSION
J-AGGREGATE
ABSORPTION
DYE
MONOLAYERS
DYNAMICS

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title = "A nonlinear optical study of Frenkel excitons in Langmuir-Blodgett films",

abstract = "We report results of a nonlinear optical investigation of the J-band of pseudoisocyanine iodide in a Langmuir-Blodgett film. The spectral narrowing of the fluorescence compared to the absorption spectrum at 77 K is ascribed to exciton relaxation in a disordered band. Resonance Rayleigh scattering and accumulated photon-echo experiments show that the exciton dephasing rate increases rapidly at energies above the renormalized band edge. This effect is linked to a change in localization of the excitons. At 1.5 K, the system{\textquoteright}s disorder is found to be larger, which leads to greater localization of the excitons. Monte Carlo calculation of the J-band{\textquoteright}s line shape at several temperatures supports the interpretation given.",

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author = "Jacob Terpstra and Henk Fidder and Wiersma, {Douwe A.}",

note = "Relation: http://www.rug.nl/scheikunde/ date_submitted:2006 Rights: University of Groningen. Materials Science Centre",

year = "1991",

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doi = "10.1016/0009-2614(91)85165-S",

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T1 - A nonlinear optical study of Frenkel excitons in Langmuir-Blodgett films

AU - Terpstra, Jacob

AU - Fidder, Henk

AU - Wiersma, Douwe A.

N1 - Relation: http://www.rug.nl/scheikunde/ date_submitted:2006 Rights: University of Groningen. Materials Science Centre

PY - 1991/4/26

Y1 - 1991/4/26

N2 - We report results of a nonlinear optical investigation of the J-band of pseudoisocyanine iodide in a Langmuir-Blodgett film. The spectral narrowing of the fluorescence compared to the absorption spectrum at 77 K is ascribed to exciton relaxation in a disordered band. Resonance Rayleigh scattering and accumulated photon-echo experiments show that the exciton dephasing rate increases rapidly at energies above the renormalized band edge. This effect is linked to a change in localization of the excitons. At 1.5 K, the system’s disorder is found to be larger, which leads to greater localization of the excitons. Monte Carlo calculation of the J-band’s line shape at several temperatures supports the interpretation given.

AB - We report results of a nonlinear optical investigation of the J-band of pseudoisocyanine iodide in a Langmuir-Blodgett film. The spectral narrowing of the fluorescence compared to the absorption spectrum at 77 K is ascribed to exciton relaxation in a disordered band. Resonance Rayleigh scattering and accumulated photon-echo experiments show that the exciton dephasing rate increases rapidly at energies above the renormalized band edge. This effect is linked to a change in localization of the excitons. At 1.5 K, the system’s disorder is found to be larger, which leads to greater localization of the excitons. Monte Carlo calculation of the J-band’s line shape at several temperatures supports the interpretation given.

KW - SUPERRADIANT EMISSION

KW - J-AGGREGATE

KW - ABSORPTION

KW - DYE

KW - MONOLAYERS

KW - DYNAMICS

U2 - 10.1016/0009-2614(91)85165-S

DO - 10.1016/0009-2614(91)85165-S

M3 - Article

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VL - 179

SP - 349

EP - 354

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 4

ER -

A nonlinear optical study of Frenkel excitons in Langmuir-Blodgett films

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