Volume 25, Issue 4 pp. 465-471
Full Paper

Theoretical Study on One- and Two-Photon Absorption Properties of PPV Derivative with Electron-Donor Phenylanthracene as Pendent Group

Liang Zhao

Liang Zhao

Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, China

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Li Mu

Li Mu

College of Environment Ecosystem and Engineering, Changchun University, Changchun, Jilin 130022, China

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Guo-Chun Yang

Guo-Chun Yang

Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, China

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Zhong-Min Su

Zhong-Min Su

Tel.: 0086-0431-85099108; Fax: 0086-0431-85894009

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Chun-Sheng Qin

Chun-Sheng Qin

Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, China

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Chen Shao

Chen Shao

Institute of Functional Material Chemistry, Faculty of Chemistry, Northeast Normal University, Changchun, Jilin 130024, China

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First published: 05 April 2007
Citations: 2

Abstract

Based on the equilibrium structures from quantum mechanics AM1 method, employing INDO/CI method and the sum-over-state (SOS) formula, the one-photon absorption (OPA) and two-photon absorption (TPA) properties as well as the second hyperpolarizabilities were discussed in detail for a kind of PPV derivative poly 2-(9-phenylan- thracen-10-yl)-1,4-phenylenevinylene (P1). The results indicate that the two-photon cross section (δ) increases with the increasing of the number of repeating segment (n), however only a slight increase corresponds to the increasing of molecular weight when the repeating unit number arrives at a certain number. From this point of view, the TPA cross section values of P1 were extrapolated through the linear fit of δ value vs. 1/n. The δ value of P1 is as high as 181 GM (1 GM10−50 cm4·s·photon−1). Concerning the influence of pendent group and extension of π-conjuga- tion on δ values, another four oligomers P2, PPV, P1-1, and P2-1 were investigated for comparison. The calculation results reveal that the position and property of pendent group have great influence on the OPA and TPA properties. A most crucial role for relatively larger δ value was played by the extension of π-conjugation.

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