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外围带咔唑基的联苯桥联二聚对苯乙烯撑的双光子吸收性能

金佳科, 宋学良, 李寒莹, 汪茫, 孙景志   

  1. 浙江大学高分子科学与工程学系, 大分子合成与功能构筑教育部重点实验室, 杭州 310027
  • 收稿日期:2008-04-28 修回日期:1900-01-01 出版日期:2009-03-10 发布日期:2009-03-10
  • 通讯作者: 孙景志

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

摘要: 报道了十字形结构对荧光生色团的双光子吸收(TPA)作用横截面积的影响. 1,4-二(9'-乙基咔唑基)- 3'-乙烯基苯(R1)是经典的具有D-π-D结构的TPA生色团. 通过一个联苯桥将两个双光吸引(TPA)链连接在一起得到的十字形分子(1)显示出比单链分子明显增大的双光子吸收作用横截面积(σ'). 在10-4 mol/L 的甲苯溶液中, 十字结构分子1σ'值为491.0×10-50 cm4·s, 而R1σ'值仅为137.5×10-50 cm4·s. σ'的放大可以归结为十字结构使TPA 生色团的偶极呈交叉排列, 抑制了浓溶液中的荧光猝灭.

关键词: 双光子吸收, 横截面积, 荧光效率, 十字结构

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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