Excited energy states in poly(p-phenylenevinylene)

J. M. Leng; D. Dick; X. Wei; Z. V. Vardeny; F. Guo; S. Mazumdar

doi:10.1080/10587259408039225

Excited energy states in poly(p-phenylenevinylene)

J. M. Leng, D. Dick, X. Wei, Z. V. Vardeny, F. Guo, S. Mazumdar

Research output: Contribution to journal › Article › peer-review

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Abstract

We have studied electronic excited states in films of poly (p-phenylene vinylene) using picosecond transient and steady state (cw) photoinduced absorption (PA) and photoluminescence (PL) as well as their excitation spectra (ES). The ps transient PA spectrum consists of two PA bands both with the same transient dynamics, one band peaks at ˜0.5 eV and the other peaks at 1.7 eV; neither of them can be related to the cw PA bands. Since the transient PL decay is correlated with the transient decay of both PA bands up to 200 ps, we conclude that the photoexcitations for t < 200 ps are radiative singlet excitons; they relax in about 200 ps and the radiative quantum efficiency substantially decreases thereafter. From the ES spectra of the cw PA band ES we tentatively assign the important excited electronic states in PPV such as the mAg exciton and the continuum band.

Original language	English (US)
Pages (from-to)	1-8
Number of pages	8
Journal	Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
Volume	256
Issue number	1
DOIs	https://doi.org/10.1080/10587259408039225
State	Published - Nov 1994

ASJC Scopus subject areas

Condensed Matter Physics

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@article{dbed25fb66be49aba977ba2834540738,

title = "Excited energy states in poly(p-phenylenevinylene)",

abstract = "We have studied electronic excited states in films of poly (p-phenylene vinylene) using picosecond transient and steady state (cw) photoinduced absorption (PA) and photoluminescence (PL) as well as their excitation spectra (ES). The ps transient PA spectrum consists of two PA bands both with the same transient dynamics, one band peaks at ˜0.5 eV and the other peaks at 1.7 eV; neither of them can be related to the cw PA bands. Since the transient PL decay is correlated with the transient decay of both PA bands up to 200 ps, we conclude that the photoexcitations for t < 200 ps are radiative singlet excitons; they relax in about 200 ps and the radiative quantum efficiency substantially decreases thereafter. From the ES spectra of the cw PA band ES we tentatively assign the important excited electronic states in PPV such as the mAg exciton and the continuum band.",

author = "Leng, {J. M.} and D. Dick and X. Wei and Vardeny, {Z. V.} and F. Guo and S. Mazumdar",

note = "Funding Information: We thank Val Masardier for providing us the PPV samples. The work at the University of Utah was supported in part by the DOE, Grant No. DE-FG-03-93, ER 45490 and by ONR Grant No. N00014-91-C-0104 at the Utah Laser Institute. At the University of Arizona, this work was supported by NSF, ECS-89-11960 and the AFOSR, Grant No. F49620-93-1-0199.",

year = "1994",

month = nov,

doi = "10.1080/10587259408039225",

language = "English (US)",

volume = "256",

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T1 - Excited energy states in poly(p-phenylenevinylene)

AU - Leng, J. M.

AU - Dick, D.

AU - Wei, X.

AU - Vardeny, Z. V.

AU - Guo, F.

AU - Mazumdar, S.

N1 - Funding Information: We thank Val Masardier for providing us the PPV samples. The work at the University of Utah was supported in part by the DOE, Grant No. DE-FG-03-93, ER 45490 and by ONR Grant No. N00014-91-C-0104 at the Utah Laser Institute. At the University of Arizona, this work was supported by NSF, ECS-89-11960 and the AFOSR, Grant No. F49620-93-1-0199.

PY - 1994/11

Y1 - 1994/11

N2 - We have studied electronic excited states in films of poly (p-phenylene vinylene) using picosecond transient and steady state (cw) photoinduced absorption (PA) and photoluminescence (PL) as well as their excitation spectra (ES). The ps transient PA spectrum consists of two PA bands both with the same transient dynamics, one band peaks at ˜0.5 eV and the other peaks at 1.7 eV; neither of them can be related to the cw PA bands. Since the transient PL decay is correlated with the transient decay of both PA bands up to 200 ps, we conclude that the photoexcitations for t < 200 ps are radiative singlet excitons; they relax in about 200 ps and the radiative quantum efficiency substantially decreases thereafter. From the ES spectra of the cw PA band ES we tentatively assign the important excited electronic states in PPV such as the mAg exciton and the continuum band.

AB - We have studied electronic excited states in films of poly (p-phenylene vinylene) using picosecond transient and steady state (cw) photoinduced absorption (PA) and photoluminescence (PL) as well as their excitation spectra (ES). The ps transient PA spectrum consists of two PA bands both with the same transient dynamics, one band peaks at ˜0.5 eV and the other peaks at 1.7 eV; neither of them can be related to the cw PA bands. Since the transient PL decay is correlated with the transient decay of both PA bands up to 200 ps, we conclude that the photoexcitations for t < 200 ps are radiative singlet excitons; they relax in about 200 ps and the radiative quantum efficiency substantially decreases thereafter. From the ES spectra of the cw PA band ES we tentatively assign the important excited electronic states in PPV such as the mAg exciton and the continuum band.

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Excited energy states in poly(p-phenylenevinylene)

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