Excitations and optical properties of phenylene-based conjugated polymers and oligomers

S. Brazovskii, N. Kirova, A. R. Bishop, V. Klimov, D. McBranch, N. N. Barashkov, J. P. Ferraris

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42 Citations (Scopus)

Abstract

We present a combined experimental and theoretical study of the ground and photoexcited optical properties of a model oligomer of PPV, MEH-DSB. Our theoretical picture is based upon a band description of electronic states of PPV oligomers, while invoking corrections from Coulomb interactions. The necessary discrete energy levels at low and intermediate energies appear naturally, in addition to the lower energy delocalized states. On this basis we identify the most important features in direct optical absorption for both high (4-6 eV) and low (2-4 eV) photon energies as well as in photinduced absorption (PA) and stimulated photoemissions (SE) in MEH-DSB solutions, which represent the limit of noninteracting oligomers. While in agreement with previous interpretations for three absorption peaks (2.74, 4.46 and 6.2 eV), we give a new assignment for the most disputed 3.62 eV one as well as for the two PA peaks.

Original languageEnglish
Pages (from-to)472-479
Number of pages8
JournalOptical Materials
Volume9
Issue number1-4
DOIs
Publication statusPublished - Jan 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

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    Brazovskii, S., Kirova, N., Bishop, A. R., Klimov, V., McBranch, D., Barashkov, N. N., & Ferraris, J. P. (1998). Excitations and optical properties of phenylene-based conjugated polymers and oligomers. Optical Materials, 9(1-4), 472-479. https://doi.org/10.1016/S0925-3467(97)00074-8