Acta Chimica Sinica ›› 2010, Vol. 68 ›› Issue (18): 1837-1844. Previous Articles     Next Articles

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  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
  • 基金资助:


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

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