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 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry
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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 journal › Article
TY - JOUR
T1 - Low-lying two-photon excitations in poly(p-phenylene vinylene) and its derivatives
AU - Guo, Fangyeong
AU - Shih, Z. Y.
PY - 2003/3/14
Y1 - 2003/3/14
N2 - 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.
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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U2 - 10.1016/S0009-2614(03)00152-0
DO - 10.1016/S0009-2614(03)00152-0
M3 - Article
VL - 370
SP - 572
EP - 577
JO - Chemical Physics Letters
JF - Chemical Physics Letters
SN - 0009-2614
IS - 3-4
ER -