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

F. Guo, Z. Y. Shih

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


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
Issue number3-4
Publication statusPublished - 2003 Mar 14

All Science Journal Classification (ASJC) codes

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

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