Low-lying two-photon excitations in poly(p-phenylene vinylene) and its derivatives

Fangyeong Guo, Z. Y. Shih

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We study the low-lying two-photon excited states in nonlinear optical processes in poly(p-phenylene vinylene) (PPV) and its derivatives. We find that, within the Pariser-Parr-Pople (PPP) model, the mAg state in (unsubstituted) PPV is exactly the lowest two-photon excited state (i.e., the 21Ag+ state). Due to the breaking of charge-conjugation symmetry, the 2Ag in substituted PPVs, originating from the 11Ag-, is weakly two-photon allowed, while the mAg has its origin from the 21Ag+, hence giving a strong peak in the two-photon absorption spectra.

Original languageEnglish
Pages (from-to)572-577
Number of pages6
JournalChemical Physics Letters
Volume370
Issue number3-4
DOIs
Publication statusPublished - 2003 Mar 14

Fingerprint

Photons
Derivatives
photons
Excited states
excitation
conjugation
Absorption spectra
absorption spectra
poly(4-phenylenevinylene)
symmetry

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

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abstract = "We study the low-lying two-photon excited states in nonlinear optical processes in poly(p-phenylene vinylene) (PPV) and its derivatives. We find that, within the Pariser-Parr-Pople (PPP) model, the mAg state in (unsubstituted) PPV is exactly the lowest two-photon excited state (i.e., the 21Ag+ state). Due to the breaking of charge-conjugation symmetry, the 2Ag in substituted PPVs, originating from the 11Ag-, is weakly two-photon allowed, while the mAg has its origin from the 21Ag+, hence giving a strong peak in the two-photon absorption spectra.",
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Low-lying two-photon excitations in poly(p-phenylene vinylene) and its derivatives. / Guo, Fangyeong; Shih, Z. Y.

In: Chemical Physics Letters, Vol. 370, No. 3-4, 14.03.2003, p. 572-577.

Research output: Contribution to journalArticle

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AB - We study the low-lying two-photon excited states in nonlinear optical processes in poly(p-phenylene vinylene) (PPV) and its derivatives. We find that, within the Pariser-Parr-Pople (PPP) model, the mAg state in (unsubstituted) PPV is exactly the lowest two-photon excited state (i.e., the 21Ag+ state). Due to the breaking of charge-conjugation symmetry, the 2Ag in substituted PPVs, originating from the 11Ag-, is weakly two-photon allowed, while the mAg has its origin from the 21Ag+, hence giving a strong peak in the two-photon absorption spectra.

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