Theory of biexcitons in Φconjugated polymers

F. Guo, M. Chandross, Sumitendra Mazumdar

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Theoretical models of Φconjugated polymers that emphasize the Coulomb electron-electron correlations predict that the lowest optical excitation is to an exciton. We have extended our theoretical studies to an energy region that is considerably higher, to probe specifically the states that axe reached by two-electron excitations from the ground state. Theoretical evidence for the biexciton, a bound state of two excitons that occurs below the two-electron continuum, is found. The lowest biexciton state is of even parity, can be reached by optical excitation from the 1BU exciton, and in principle also by two-photon excitation from the ground state. A high energy photoinduced absorption seen in the picosecond time domain in poly (yaro-phenylenevinylene) (PPV), as well as in other Φconjugated polymers, is interpreted as a transition from the exciton to the biexciton.

Original languageEnglish (US)
Pages (from-to)53-62
Number of pages10
JournalMolecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
Volume256
Issue number1
DOIs
StatePublished - 1994

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Conjugated polymers
Excitons
excitons
Photoexcitation
polymers
Ground state
excitation
Electrons
electrons
Electron correlations
ground state
energy absorption
Energy absorption
Electron transitions
parity
Photons
continuums
LDS 751
probes
photons

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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abstract = "Theoretical models of Φconjugated polymers that emphasize the Coulomb electron-electron correlations predict that the lowest optical excitation is to an exciton. We have extended our theoretical studies to an energy region that is considerably higher, to probe specifically the states that axe reached by two-electron excitations from the ground state. Theoretical evidence for the biexciton, a bound state of two excitons that occurs below the two-electron continuum, is found. The lowest biexciton state is of even parity, can be reached by optical excitation from the 1BU exciton, and in principle also by two-photon excitation from the ground state. A high energy photoinduced absorption seen in the picosecond time domain in poly (yaro-phenylenevinylene) (PPV), as well as in other Φconjugated polymers, is interpreted as a transition from the exciton to the biexciton.",
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T1 - Theory of biexcitons in Φconjugated polymers

AU - Guo, F.

AU - Chandross, M.

AU - Mazumdar, Sumitendra

PY - 1994

Y1 - 1994

N2 - Theoretical models of Φconjugated polymers that emphasize the Coulomb electron-electron correlations predict that the lowest optical excitation is to an exciton. We have extended our theoretical studies to an energy region that is considerably higher, to probe specifically the states that axe reached by two-electron excitations from the ground state. Theoretical evidence for the biexciton, a bound state of two excitons that occurs below the two-electron continuum, is found. The lowest biexciton state is of even parity, can be reached by optical excitation from the 1BU exciton, and in principle also by two-photon excitation from the ground state. A high energy photoinduced absorption seen in the picosecond time domain in poly (yaro-phenylenevinylene) (PPV), as well as in other Φconjugated polymers, is interpreted as a transition from the exciton to the biexciton.

AB - Theoretical models of Φconjugated polymers that emphasize the Coulomb electron-electron correlations predict that the lowest optical excitation is to an exciton. We have extended our theoretical studies to an energy region that is considerably higher, to probe specifically the states that axe reached by two-electron excitations from the ground state. Theoretical evidence for the biexciton, a bound state of two excitons that occurs below the two-electron continuum, is found. The lowest biexciton state is of even parity, can be reached by optical excitation from the 1BU exciton, and in principle also by two-photon excitation from the ground state. A high energy photoinduced absorption seen in the picosecond time domain in poly (yaro-phenylenevinylene) (PPV), as well as in other Φconjugated polymers, is interpreted as a transition from the exciton to the biexciton.

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