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Citation: XU Hai, HE Feng, YANG Bing, ZHANG Hou-Yu, LIU Sui-Jun, GU Xin, LIU Dan-Dan, LIU Xiao-Dong, YU Jing-Sheng, MA Yu-Guang. Ground, Excited Structures and Photoelectronic Properties of Poly(p-phenylenevinylene) Oli mers with Biphenyl Bridge[J]. Acta Physico-Chimica Sinica, ;2009, 25(05): 869-875. doi: 10.3866/PKU.WHXB20090517 shu

Ground, Excited Structures and Photoelectronic Properties of Poly(p-phenylenevinylene) Oli mers with Biphenyl Bridge

1.
State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, P. R. China; College of Chemistry, Jilin University, Changchun 130012, P. R. China

Received Date: 9 January 2009
Available Online: 16 March 2009

Ground and excited state structures of several poly(p-phenylenevinylene) (PPV) oli mers that contain a biphenyl bridge were fully optimized by density functional theory (DFT) and the configuration interaction singles (CIS) method, respectively. The most rational geometric structures for the ground state, the excited state and frontier molecular orbitals were obtained. The absorption and emission properties of the oli mers were then calculated using the semi-empirical Zerner's intermediate neglect of differential overlap (ZINDO) and time-dependent density functional theory (TD-DFT). We analyzed the effect of an increase in the biphenyl chain length on frontier molecular orbitals and the energy gap. Results indicate that absorption and emission properties hardly change as the length of the biphenyl chain increases. A cross configuration between neighboring PPV oli mer chains and the degree of intrachain twist becomes increasingly obvious. Molecular symmetry is reduced and the π-π stacking effect is weakened among these types of conjugated molecules in a solid. This is perhaps the most important factor for an increase in the fluorescence quantumefficiency of light-emitting diodes.
- PPV oli mer,
- Ground state,
- Excited state,
- Photoelectronic property
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