高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (10): 2441.

• 研究论文 • 上一篇    下一篇

三苯胺-噁二唑超支化共轭聚合物的多光子泵浦绿色荧光

钱鹰1, 闾新明1, 周志强2, 崔一平2   

  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
  • 收稿日期:2010-10-20 修回日期:2011-01-07 出版日期:2011-10-10 发布日期:2011-09-11
  • 通讯作者: 钱鹰 E-mail:yingqian@seu.edu.cn
  • 基金资助:

    国家自然科学基金(批准号: 60678042, 61178057和61177033)资助.

Multiphoton Pumped Green Fluorescence in a Hyperbranched Triphenylamine-oxadiazole Conjugated Polymer

QIAN Ying1*, LÜ Xin-Ming1, ZHOU Zhi-Qiang2, 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:2010-10-20 Revised:2011-01-07 Online:2011-10-10 Published:2011-09-11
  • Contact: QIAN Ying E-mail:yingqian@seu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 60678042, 61178057和61177033)资助.

摘要: 采用钯催化Heck反应制备了一种新型三苯胺-噁二唑超支化荧光聚合物PI. 用飞秒Ti:sapphire激光研究了PI的三光子和双光子上转换荧光光谱, 激发波长位于近红外区(800~1350 nm). 在1280 nm和80 fs激光激发下, PI的三光子上转换荧光发射波长分别为525 nm(THF), 534 nm(CH2Cl2)和578 nm(DMF). 在800 nm和150 fs激光激发下, PI的双光子上转换荧光发射波长分别为527 nm(THF), 532 nm(CH2Cl2)和573 nm(DMF). 采用非线性透过率法测定荧光聚合物PI的三光子和双光子吸收系数. 系统研究了PI的线性吸收和透过、单光子荧光、荧光寿命、前线轨道能级及热稳定性. 实验结果表明, 三苯胺-噁二唑超支化共轭聚合物的多光子吸收和上转换荧光发射性能比树型分子或线型聚合物更为优异.

关键词: 超支化荧光聚合物, 钯催化Heck反应, 三光子吸收, 三光子激发荧光, 双光子吸收, 双光子激发荧光

Abstract: A novel hyperbranched triphenylamine-oxadiazole fluorescence polymer PI was synthesized by Pd-catalyzed Heck reaction. Three-photon and two-photon upconversion fluorescence spectra of PI were measured using a femtosecond Ti:sapphire that was pumped by a femtosecond laser at the near-infrared region of 800 ~ 1350 nm. Its three-photon and two-photon absorption coefficient was determined by mearuring the nonlinear transmissivity at a known input intensity level. The three-photon excited fluorescence have been observed with the central wavelength at 525 nm in THF , at 534 nm in CH2Cl2 and at 578 nm in DMF, respectively. The maximum peaks of two-photon excited fluorescence were at 527 nm in THF , at 532 nm in CH2Cl2 and at 573 nm in DMF, respectively. Increased solvent polarity were found to induced a marked red-shift of the emission band of multiphoton pumped fluorescence in polymer PI. The hyperbranched triphenylamine-oxadiazole conjugated polymer displayed large multi-photon absorption and strong upconversion fluorescence properties.

Key words: Hyperbranched fluorescence polymer, Pd-catalyzed Heck reaction, Three-photon absorption, Three-photon excited fluorescence, Two-photon absorption, Two-photon excited fluorescence

TrendMD: