Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (01): 115-119.doi: 10.3866/PKU.WHXB20100127

• QUANTUM CHEMISTRY AND COMPUTATION CHEMISTRY • Previous Articles     Next Articles

Electronic Structures and Optical Properties of Indolocarbazole Isomers

WANG Hui-Ping, BAI Fu-Quan, ZHENG Qing-Chuan, ZHAO Zeng-Xia, ZHAO Xiao-Jie, ZHANG Hong-Xing   

  1. State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, P. R. China
  • Received:2009-08-31 Revised:2009-11-16 Published:2009-12-29
  • Contact: ZHANG Hong-Xing E-mail:zhanghx@jlu.edu.cn

Abstract:

Density functional theory (DFT) and the configuration interaction with single excitations (CIS) method were used to optimize the ground state and excited state structures of five indolocarbazole molecules using the 6-31G(d,p) basis set. Based on their geometric structures, the absorption and emission spectra were calculated using time-dependent DFT (TD-DFT) with the same basis set and employing the polarizable continuum medium model (PCM). There are obvious differences in the emission spectra of these isomers as isomer 5 has larger oscillator strength in its emission spectrum, but its transition energies are the lowest among the isomers. The emission peak value of isomer 4 is the highest and the oscillator strengths of isomer 2 are the weakest from 250 to 450 nm. This is because the structures change from ground state to the excited state and the molecular orbital (MO) energy levels of these molecules are different. We also evaluated the nonlinear optical response (first hyperpolarizability) of this series of molecules. The calculated polarizabilities are similar but the static first hyperpolarizabilities (β0) are different. The β0 of isomer 2 is the largest among the compounds investigated.

Key words: Density functional theory, Time-dependent density functional theory, Indolocarbazole, Configuration interaction with single excitation method, Absorption and emission spectra, Nonlinear optical response

MSC2000: 

  • O641