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 language | English |
|---|---|
| Pages (from-to) | 572-577 |
| Number of pages | 6 |
| Journal | Chemical Physics Letters |
| Volume | 370 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - 2003 Mar 14 |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry
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Guo, F., & Shih, Z. Y. (2003). Low-lying two-photon excitations in poly(p-phenylene vinylene) and its derivatives. Chemical Physics Letters, 370(3-4), 572-577. https://doi.org/10.1016/S0009-2614(03)00152-0