Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (4): 703.

• Articles • Previous Articles     Next Articles

Three-photon Absorption and Upconversion Fluorescence of Bis-, Quadri-, Octu-branched Symmetrical Oxadiazole Derivatives

QIAN Ying1*, ZHU Xiao-Qin1, JI Yan1, HUANG Wei2, LÜ Chang-Gui2, CUI Yi-Ping2   

  1. 1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China;
    2. Advanced Photonics Center, Southeast University, Nanjing 210096, China
  • Received:2009-06-02 Online:2010-04-10 Published:2010-04-10
  • Contact: QIAN Ying. E-mail: yingqian@seu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 60678042, 60877024)和东南大学科学基金(批准号: 9207041399)资助.

Abstract:

The three-photon absorption and the three-photon-excited fluorescence spectra of three symmetrical oxadiazole derivatives, 4-[N,N-bis(4-{4-[5-(4-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]styryl}phenyl)amino]benzaldehyde(Bis-oxa), 2,5-bis(4-{2-N,N-bis[4-(2-{4-[5-(4-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]-phenyl}-vinyl)phenyl]aminostyryl}phenyl)-1,3,4-oxadiazole(Quadri-oxa) and 2,5-bis(4-{2-N,N-bis[4-(2-{3,5-di-[5-(4-tert-butylphenyl)-1,3,4-oxadiazol-2-yl]phenyl}-1-ethenyl-)phenyl]aminostyryl}phenyl)-1,3,4-oxadiazole(Octu-oxa) were measured by nonlinear transmission method using a femtosecond Ti∶sapphire laser. Their three-photon absorption coefficients of 1260 nm were 5.0×10-5, 10.0×10-5 and 10.0×10-5 cm3/GW2, respectively. Pumped by a femtosecond laser at 1260 nm, strong upconversion fluorescence with the central wavelength at 533 nm(Bis-oxa), 544 nm(Quadri-oxa)and 551 nm(Octu-oxa) in the solution of CH2Cl2 have been observed. A detailed spectroscopic study of these chromophores, including absorption, fluorescence emission, fluorescence lifetime, multiphoton excited fluorescence and 3PA coefficient were measured. The multibranched symmetrical oxadiazole derivatives display large three-photon absorption and strong upconversion fluorescence properties.

Key words: Symmetrical oxadiazole derivatives; Three-photon absorption; Multiphoton upconversion fluorescence; Fluorescence lifetime

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