Infrared light emission from π-conjugated polymers: A diagrammatic exciton basis valence bond theory

S. Dallakyan, M. Chandross, Sumitendra Mazumdar

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

There is currently a great need for solid-state lasers that emit in the infrared, as this is the operating wavelength regime for applications in telecommunications. Existing π-conjugated polymers all emit in the visible or ultraviolet, and whether or not π-conjugated polymers that emit in the infrared can be designed is an interesting challenge. On the one hand, the excited-state ordering in trans-polyacetylene, the π-conjugated polymer with a relatively small optical gap, is not conducive to light emission because of electron-electron interaction effects. On the other hand, excited-state ordering opposite to that in trans-polyacetylene is usually obtained by chemical modification that increases the effective bond alternation, which in turn increases the optical gap. We develop a theory of electron correlation effects in a model π-conjugated polymer that is obtained by replacing the hydrogen atoms of trans-polyacetylene with transverse conjugated groups and show that the effective on-site correlation in this system is smaller than the bare correlation in the unsubstituted system. An optical gap in the infrared as well as excited-state ordering conducive to light emission is thereby predicted with similar structural features.

Original languageEnglish (US)
Article number075204
Pages (from-to)752041-7520410
Number of pages6768370
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume68
Issue number7
StatePublished - Aug 2003

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Polyacetylenes
Conjugated polymers
Light emission
Excitons
light emission
polyacetylene
excitons
Excited states
Infrared radiation
valence
polymers
excitation
Electron-electron interactions
Electron correlations
Solid state lasers
Chemical modification
alternations
solid state lasers
Telecommunication
telecommunication

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Infrared light emission from π-conjugated polymers : A diagrammatic exciton basis valence bond theory. / Dallakyan, S.; Chandross, M.; Mazumdar, Sumitendra.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 68, No. 7, 075204, 08.2003, p. 752041-7520410.

Research output: Contribution to journalArticle

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