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

F. Guo; Z. Y. Shih

doi:10.1016/S0009-2614(03)00152-0

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

F. Guo, Z. Y. Shih

Department of Physics

Research output: Contribution to journal › Article › peer-review

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 mA_g state in (unsubstituted) PPV is exactly the lowest two-photon excited state (i.e., the 2¹A_g⁺ state). Due to the breaking of charge-conjugation symmetry, the 2A_g in substituted PPVs, originating from the 1¹A_g^-, is weakly two-photon allowed, while the mA_g has its origin from the 2¹A_g⁺, 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	https://doi.org/10.1016/S0009-2614(03)00152-0
Publication status	Published - 2003 Mar 14

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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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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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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