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Chem. J. Chinese Universities

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Two Photon Absorption Property of a PPV Oligomer with Central Biphenyl Bridge and Peripheral Carbazole Substituents

JIN Jia-Ke, SONG Xue-Liang, LI Han-Ying, WANG Mang, SUN Jing-Zhi*   

  1. Department of Polymer Science & Engineering, Key Laboratory of Macromolecule Synthesis and Functionalization of Ministry of Education, Zhejiang University, Hangzhou 310027, China
  • Received:2008-04-28 Revised:1900-01-01 Online:2009-03-10 Published:2009-03-10
  • Contact: SUN Jing-Zhi

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Abstract:

The effect of cruciform structure on the two photon absorption action cross-section of fluorescence chromophore was reported. 1,4-Di(9'-ethyl-carbazolyl)- 3'-vinylbenzene(R1) is a classic two photon absorption(TPA) chromophore with D-π-D structure. By linking two TPA chains with a biphenyl bridge, the obtained cruciform molecule(1) exhibits evidently larger two photon absorption action cross-section(σ') than its single-chain counterpart. For example, in 10-4 mol/L toluene solution, cruciform 1 shows a σ' value of 491.0×10-50 cm4·s, while the σ' value of R1 is only 137.5×10-50 cm4·s. The amplification of σ' was ascribed to the cruciform structure, which rendered the TPA chromophores with cross dipole arrangement and curbed the fluorescence quenching in concentrated solutions.

Key words: Two photon absorption, Cross section, Fluorescence efficiency, Cruciform

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