Acta Phys. -Chim. Sin. ›› 2008, Vol. 24 ›› Issue (10): 1780-1784.doi: 10.3866/PKU.WHXB20081008

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Two-Photon Frequency-Upconversion Fluorescence of Multibranch Chromophores with Nitrogen-Coupling Center

QIAN Ying; MENG Kang; LV Chang-Gui; HUANG Wei; CUI Yi-Ping   

  1. School of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, P. R. China; School of Electronic Science and Engineering, Southeast University, Nanjing 210096, P. R. China
  • Received:2008-05-14 Revised:2008-06-11 Published:2008-10-08
  • Contact: QIAN Ying

Abstract: Two-photon absorption (TPA) properties of multibranch chromophores with nitrogen coupling center, N-[4-{2-(3,5-di-{5-[4-(tert-butyl)phenyl]-1,3,4-oxadiazol-2-yl}phenyl)-1-ethenyl}phenyl]-N,N-diphenylamine (BPODPA), N,N-bis[4-{2(3,5-di-{5-[4-(tert-butyl)phenyl]-1,3,4-oxadiazol-2-yl}phenyl)-1-ethenyl}phenyl]-N-phenylamine (BBPOPA) and N,N,N-tris[4-{2-(3,5-di-{5-[4-(tert-butyl)phenyl]-1,3,4-oxadiazol-2-yl}phenyl)-1-ethenyl}phenyl] amine (TBPOA), were measured by nonlinear transmission method. Single photon excited fluorescence and two-photon excited fluorescence (TPEF) of the chromophores were studied. The effect of dendronization on the TPA and TPEF characters of triphenylamine-based chromophores was investigated. When pumped with 800 nm laser irradiation, chromophores BPODPA, BBPOPA, and TBPOA showed strong two-photon excited blue green fluorescence at 502, 515, and 518 nm, respectively. These multibranched chromophores showed large TPA cross-section. The enhanced two-photon absorption found in these chromophores was attributed to the fact that the multibranched chromophores had both an extended π-conjugated system and an increased intramolecular cooperative effect compared to the one-branched chromophore.

Key words: Multibranch chromophore, Two-photon absorption, Two-photon excited fluorescence, Frequency upconversion


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