Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (03): 707-713.doi: 10.3866/PKU.WHXB20100305

• PHOTOCHEMISTRY AND SPECTROSCOPY • Previous Articles     Next Articles

Nonlinear Optical Properties and Ultrafast Dynamics of a New Blue-Light Emitting Polymer

WANG Yao-Chuan, YAN Yong-Li, ZHOU Hui, HE Nan, FENG Miao, QIAN Shi-Xiong, CHEN Yu   

  1. Department of Physics, Fudan University, Shanghai 200433, P. R. China; Surface Physics Laboratory (National Key Laboratory), Fudan University, Shanghai 200433, P. R. China; Key Laboratory for Advanced Materials, Department of Chemistry, East China University of Science and Technology, Shanghai 200237, P. R. China; College of Materials Science and Engineering, Fuzhou University, Fuzhou 350002, P. R. China
  • Received:2009-10-21 Revised:2009-12-15 Published:2010-03-03
  • Contact: QIAN Shi-Xiong, CHEN Yu E-mail:sxqian@fudan.ac.cn; chentangyu@yahoo.com

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Abstract:

The nonlinear optical properties and the excited state dynamics of a new blue-light emitting polymer poly[5-(diphenylamino)-1,3-phenylenevinylene] (Yu1) and its starting material 5-(N,N-diphenylamino)benzene-1,3-dicarbaldehyde (Yu0) were studied. In contrast to the monomer Yu0, the two-photon absorption (TPA) properties of Yu1 were found to be significantly enhanced upon polymerization. The TPA cross section of Yu1 (per repeating unit) increased about tenfold compared to Yu0. Femtosecond pump-probe experiments were carried out to study the excited state dynamics of the two materials. An investigation of the ultrafast dynamics demonstrated that different relaxation processes occurred in the Yu0 and Yu1 samples. Apparent optical anisotropy was observed from a one-color pump-probe experiment of the polymer Yu1 at 400 nm. The fast component observed in the parallel configuration of Yu1 disappeared when the perpendicular polarization configuration was used because of the high orientation of exciton migration. The nonlinear optical study and the ultrafast dynamics results indicated that the onlinear optical properties were enhanced because of monomer polymerization.

Key words: Two-photon absorption, Two-photon fluorescence, Blue-light emitting polymer, Z-scan, Excited state dynamics