Theory of biexcitons in Φconjugated polymers

Fangyeong Guo, M. Chandross, S. 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
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
Publication statusPublished - 1994 Jan 1

Fingerprint

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

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

@article{8e1e4711ad344756acd4398dbbeecc04,
title = "Theory of biexcitons in Φconjugated polymers",
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.",
author = "Fangyeong Guo and M. Chandross and S. Mazumdar",
year = "1994",
month = "1",
day = "1",
doi = "10.1080/10587259408039231",
language = "English",
volume = "256",
pages = "53--62",
journal = "Molecular Crystals and Liquid Crystals",
issn = "1542-1406",
publisher = "Taylor and Francis Ltd.",
number = "1",

}

Theory of biexcitons in Φconjugated polymers. / Guo, Fangyeong; Chandross, M.; Mazumdar, S.

In: Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol. 256, No. 1, 01.01.1994, p. 53-62.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Theory of biexcitons in Φconjugated polymers

AU - Guo, Fangyeong

AU - Chandross, M.

AU - Mazumdar, S.

PY - 1994/1/1

Y1 - 1994/1/1

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.

UR - http://www.scopus.com/inward/record.url?scp=30244495477&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=30244495477&partnerID=8YFLogxK

U2 - 10.1080/10587259408039231

DO - 10.1080/10587259408039231

M3 - Article

AN - SCOPUS:30244495477

VL - 256

SP - 53

EP - 62

JO - Molecular Crystals and Liquid Crystals

JF - Molecular Crystals and Liquid Crystals

SN - 1542-1406

IS - 1

ER -