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化学学报
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化学学报 ›› 2010, Vol. 68 ›› Issue (18): 1837-1844. 上一篇    下一篇

研究论文

星型二苯乙烯衍生物的三光子吸收及多光子荧光发射

钱鹰*,1，胡凯明1，林国强1，周志强2，崔一平2   

  1. (1东南大学化学化工学院 南京 211189)
    (2东南大学先进光子学中心 南京 210096)
  • 投稿日期:2009-10-15 修回日期:2010-04-09 发布日期:2010-05-23
  • 通讯作者: 钱鹰 E-mail:yingqian@seu.edu.cn
  • 基金资助:

    国家自然科学基金

Three-photon Absorption and Multiphoton Fluorescence Emission in Star-shaped Stilbene Chromophores

Qian Ying*,1 Hu Kaiming1 Lin Guoqiang1 Zhou Zhiqiang2 Cui Yiping2   

  1. (1 School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189)
    (2 Advanced Photonics Center, Southeast University, Nanjing 210096)
  • Received:2009-10-15 Revised:2010-04-09 Published:2010-05-23
  • Contact: QIAN Ying E-mail:yingqian@seu.edu.cn

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被引次数

12 | 2

用飞秒Ti:sapphire激光测定了星型二苯乙烯衍生物2,5-二{4-{2-N,N-二[4-(2-N,N-二苯基氨基苯乙烯基)苯基]氨基苯乙烯基}苯基}-1,3,4-噁二唑(DPASPO)和1,2,4,5-四(4-N,N-二苯氨基苯乙烯基)苯(PASB)的三光子吸收谱和多光子上转换荧光光谱. 研究了星形八极矩分子DPASPO和PASB的线性吸收、单光子荧光及荧光寿命. 在800 nm波长的飞秒激光激发下, DPASPO和PASB在二氯甲烷溶液中发出很强的黄绿色双光子上转换荧光, 荧光峰分别位于583 nm和547 nm. 在1260 nm波长的飞秒激光激发下, DPASPO和PASB的三光子上转换荧光峰分别位于612 nm和572 nm. 采用非线性透过率法测得DPASPO和PASB最大三光子吸收截面分别为16.69×10－79 cm6•s2和6.81×10－79 cm6•s2. 这些二苯乙烯衍生物的三光子吸收截面较大. 在这些星型分子中, 三光子吸收增强来源于二苯乙烯分支的增加, 共轭体系的扩展以及分子内跨越空间电荷离域.

关键词: 星型生色分子, 三光子吸收, 双光子荧光, 三光子荧光, 三光子吸收截面, 上转换荧光

The three-photon absorption and multiphoton upconversion fluorescence spectra of star-shaped stilbene derivatives 2,5-bis{4-{2-N,N-bis[4-(2-N,N-diphenyl-amino-phenyl-vinyl)phenyl]aminostyryl} phenyl}-1,3,4-oxadiazole (DPASPO) and 1,2,4,5-tetra(4-N,N-diphenylaminostyryl)benzene (PASB) were measured using a femtosecond Ti:sapphire laser. The absorption, one-photon fluorescence and fluorescence lifetime have been investigated. When pumped with 800 nm femtosecond laser irradiation, chromophore DPASPO and PASB show strong two-photon excited yellow green fluorescence at 583 nm and 547 nm respectively. When pumped with 1260 nm femtosecond laser, DPASPO and PASB show strong three-photon excited fluorescence at 612 nm and 572 nm in the solution of dichloromethane, respectively. Three-photon absorption cross-sections determined by nonlinear transmission method are 16.69×10－79 cm6•s2 (1300 nm) for DPASPO and 6.81×10－79 cm6•s2 (1320 nm) for PASB, respectively. These stilbene derivatives show large 3PA cross-sections. In these star-shaped chromophores, the increasing the stilbene-branched moieties and an extended π-conjugation domain, and through-space delocalization results in a increase of three photon absorption.

Key words: star-shaped chromophores, three-photon absorption, two-photon excited fluorescence, three-photon excited fluorescence, three-photon absorption cross-sections, upconversion fluorescence