物理化学学报 >> 1996, Vol. 12 >> Issue (05): 413-417.doi: 10.3866/PKU.WHXB19960506

研究论文 上一篇    下一篇

LB膜中聚集体的时间分辨荧光研究

陆兴泽,马世红,宋捷,韩奎,郑家骠,王文澄   

  1. 三束材料改性国家重点实验室,复旦大学物理系,上海 200433
  • 收稿日期:1995-09-11 修回日期:1995-12-18 发布日期:1996-05-15
  • 通讯作者: 陆兴泽

Time-Resolved Fluorescence Lnvestigations of Aggregation in LB Films

Lu Xing-Ze,Ma Shi-Hong,Song Jie,Han Kui,Zheng Jia-Biao,Wang Wen-Cheng   

  1. State Key Joint Laboratory for Materials Modification by Laser,Ion and Electro Beams,Physics Department,Fudan University,Shanghai 200433
  • Received:1995-09-11 Revised:1995-12-18 Published:1996-05-15
  • Contact: Lu Xing-Ze

摘要:

利用吸收、稳态和时间分辨荧光方法研究了苯腙(PD)和半花菁(DAEP)分子在Z型LB多层膜中的聚集体性质. 苯腙和半花菁吸收光谱的红移和兰移,说明它们分别以J和H型聚集体形式存在于LB膜中. 苯腙和半花菁LB膜的荧光发射带分别在560nm和584nm处,亦分别对于它们溶液的荧光谱显示出红移和兰移的特征.它们的荧光衰减曲线能很好地用双指数模型拟合,在苯腙和半花菁LB多层膜中主要存在着荧光寿命分别在ns和10ps量级的两种组分(单体和二聚体).

关键词: LB多层膜, 聚集体, 时间分辨荧光, 苯腙, 半花菁

Abstract:

 The aggregation behavior of phenylhydrazone (PD) and hemicyanine (DAEP),in Z-type LB multilayers has been studied by absorption, steady state and time-resolved fluorescence spectroscopies. The LB multilayers of pure PD and DAEP showed J-and H-aggregate formations, characterized by a large red-shift (398nm→440nm, △E-2398cm-1 )and blue-shift (510nm→465nm, △E- 1898cm-1 ), respectively. The main fluorescence emission bands were found to be at 560 nm and 584 nm for PD and DAEP multilayers. The fluorescence decay profiles of PD and DAEP in LB films could be best-fitted by using a bi-exponential decay model. Our results reveal that there mainly exist two species (monomer and dimer) in the LB multilayers with characteristic fluorescence decay time in the order of ns and 10 ps, respectively.

Key words: Langmuir-Blodgett films, aggregation, time-resolved fluorescence, phenylhydrazone, hemicyanine