Influence of alkoxy substituents on the exciton binding energy of conjugated polymers

L. Rossi; S. F. Alvarado; W. Rieß; S. Schrader; D. G. Lidzey; D. D.C. Bradley

doi:10.1016/S0379-6779(99)00412-9

Influence of alkoxy substituents on the exciton binding energy of conjugated polymers

L. Rossi, S. F. Alvarado, W. Rieß, S. Schrader, D. G. Lidzey, D. D.C. Bradley

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Abstract

Scanning tunneling microscope (STM) spectroscopy and optical absorption measurements were used to determine the exciton binding energy (Eb) of poly(p-phenylenevinylene) (PPV). We find Eb = 0.48 ± 0.14 eV, which is significantly higher than the value of Eb reported previously for an alkoxy-PPV derivative. Furthermore, an analysis of photoluminescence (PL) and STM excited cathodoluminescence (CL) spectra, performed on PPV and on alkoxy-PPV derivatives, reveals that the energy separation between the dominant peaks in the vibronic progression is significantly smaller in the alkoxy-substituted compounds. The reduction of Eb appears to be related to the influence of the alkoxy side-chains, inducing a reduction of both the Coulomb interaction as well as the molecular structural relaxation energy of the exciton.

Original language	English (US)
Journal	Synthetic Metals
Volume	111
DOIs	https://doi.org/10.1016/S0379-6779(99)00412-9
State	Published - Jun 1 2000
Externally published	Yes

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title = "Influence of alkoxy substituents on the exciton binding energy of conjugated polymers",

abstract = "Scanning tunneling microscope (STM) spectroscopy and optical absorption measurements were used to determine the exciton binding energy (Eb) of poly(p-phenylenevinylene) (PPV). We find Eb = 0.48 ± 0.14 eV, which is significantly higher than the value of Eb reported previously for an alkoxy-PPV derivative. Furthermore, an analysis of photoluminescence (PL) and STM excited cathodoluminescence (CL) spectra, performed on PPV and on alkoxy-PPV derivatives, reveals that the energy separation between the dominant peaks in the vibronic progression is significantly smaller in the alkoxy-substituted compounds. The reduction of Eb appears to be related to the influence of the alkoxy side-chains, inducing a reduction of both the Coulomb interaction as well as the molecular structural relaxation energy of the exciton.",

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T1 - Influence of alkoxy substituents on the exciton binding energy of conjugated polymers

AU - Rossi, L.

AU - Alvarado, S. F.

AU - Rieß, W.

AU - Schrader, S.

AU - Lidzey, D. G.

AU - Bradley, D. D.C.

N1 - Generated from Scopus record by KAUST IRTS on 2019-11-27

PY - 2000/6/1

Y1 - 2000/6/1

N2 - Scanning tunneling microscope (STM) spectroscopy and optical absorption measurements were used to determine the exciton binding energy (Eb) of poly(p-phenylenevinylene) (PPV). We find Eb = 0.48 ± 0.14 eV, which is significantly higher than the value of Eb reported previously for an alkoxy-PPV derivative. Furthermore, an analysis of photoluminescence (PL) and STM excited cathodoluminescence (CL) spectra, performed on PPV and on alkoxy-PPV derivatives, reveals that the energy separation between the dominant peaks in the vibronic progression is significantly smaller in the alkoxy-substituted compounds. The reduction of Eb appears to be related to the influence of the alkoxy side-chains, inducing a reduction of both the Coulomb interaction as well as the molecular structural relaxation energy of the exciton.

AB - Scanning tunneling microscope (STM) spectroscopy and optical absorption measurements were used to determine the exciton binding energy (Eb) of poly(p-phenylenevinylene) (PPV). We find Eb = 0.48 ± 0.14 eV, which is significantly higher than the value of Eb reported previously for an alkoxy-PPV derivative. Furthermore, an analysis of photoluminescence (PL) and STM excited cathodoluminescence (CL) spectra, performed on PPV and on alkoxy-PPV derivatives, reveals that the energy separation between the dominant peaks in the vibronic progression is significantly smaller in the alkoxy-substituted compounds. The reduction of Eb appears to be related to the influence of the alkoxy side-chains, inducing a reduction of both the Coulomb interaction as well as the molecular structural relaxation energy of the exciton.

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DO - 10.1016/S0379-6779(99)00412-9

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VL - 111

JO - Synthetic Metals

JF - Synthetic Metals

ER -

Influence of alkoxy substituents on the exciton binding energy of conjugated polymers

Abstract

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