物理化学学报 >> 2010, Vol. 26 >> Issue (03): 707-713.doi: 10.3866/PKU.WHXB20100305

光化学与光谱 上一篇    下一篇

一种新型蓝光发射聚合物的非线性光学性质和超快动力学

王耀川, 闫永丽, 周慧, 何楠, 冯苗, 钱士雄, 陈彧   

  1. 复旦大学物理系, 上海 200433; 复旦大学表面物理国家重点实验室, 上海 200433; 华东理工大学化学系, 教育部结构可控先进功能材料及其制备技术重点实验室, 上海 200237; 福州大学材料科学与工程学院, 福州 350002
  • 收稿日期:2009-10-21 修回日期:2009-12-15 发布日期:2010-03-03
  • 通讯作者: 钱士雄, 陈彧 E-mail:sxqian@fudan.ac.cn; chentangyu@yahoo.com

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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摘要：

以一种新型蓝光发射聚合物多聚(5-二苯胺基)-1,3-苯乙烯(Yu1)及其单体材料5-二苯胺基苯基-1,3-二甲醛(Yu0)为研究对象, 利用飞秒Z扫描技术和泵浦-探测技术研究了这两种材料的非线性光学性质以及超快动力学. 结果表明, 聚合后, 聚合物Yu1的双光子吸收性质得到显著增强, 每重复单元的双光子吸收截面达到单体Yu0的10倍. 超快动力学研究结果揭示了Yu0和Yu1的不同弛豫过程. 聚合物Yu1的400 nm单色泵浦-探测实验结果表现出明显的各向异性: 由于激子迁移的高度方向性, 泵浦光与探测光偏振方向平行配置时观察到的快过程在偏振方向垂直配置时消失. 非线性光学性质以及超快动力学研究结果表明聚合单体对非线性性质的增强效应.

关键词: 双光子吸收, 双光子荧光, 蓝光发射聚合物, Z扫描, 激发态动力学

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