高等学校化学学报

高等学校化学学报 ›› 2011, Vol. 32 ›› Issue (4): 868.

• 研究论文 • 上一篇    下一篇

吡啶星型分子的双光子上转换荧光特性

钱鹰1, 林国强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:2010-06-21 修回日期:2010-09-28 出版日期:2011-04-10 发布日期:2011-03-09
  • 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, 60877024)资助.

Two-photon Upconversion Fluorescence Property in a Star-shaped Pyridine Chromophore

QIAN Ying1*, LIN Guo-Qiang1, 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:2010-06-21 Revised:2010-09-28 Online:2011-04-10 Published:2011-03-09
  • Contact: QIAN Ying E-mail:yingqian@seu.edu.cn
  • Supported by:

    国家自然科学基金(批准号: 60678042, 60877024)资助.

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被引次数

11

摘要： 用飞秒Ti:sapphire激光测定了一种星型吡啶分子2,5-二{4-{4-[N,N-二(4-吡啶乙烯基)苯基氨基]苯乙烯基}苯基}-1,3,4-噁二唑(PyPASPO)的双光子吸收截面及上转换荧光光谱.采用非线性透过率法测得二氯甲烷和四氢呋喃溶液中的其双光子吸收截面分别为412.5 和288.8 GM. 系统研究了吡啶星形分子PyPASPO的线性吸收和透过、单光子荧光、荧光寿命及激发-发射三维荧光谱和前线轨道能级. 在800 nm和150 fs钛宝石激光器激发下PyPASPO在二氯甲烷和四氢呋喃溶液中的双光子上转换荧光发射波长分别位于571和 525 nm,在二氯甲烷溶液中单光子荧光峰位于532 nm,荧光寿命为1.24 ns. HOMO和LUMO能级分别为-5.21 eV和-2.92 eV.增大分子内电荷转移有效增强了吡啶星形分子的双光子吸收和双光子上转换荧光发射能力

关键词: 星形分子, 吡啶衍生物, 双光子吸收截面, 非线性透过率, 双光子荧光, 前线分子轨道

Abstract: The two-photon absorption and the two-photon-excited fluorescence spectra of a star-shaped pyridine chromophore, 2,5-Bis{4-{4-[N,N-bis(4-pyridylethenyl)phenylamino]styryl} phenyl}-1,3,4- oxadiazole (PyPASPO) were measured using a femtosecond Ti:sapphire laser at 800 nm. Its two-photon absorption cross-sections obtained by nonlinear transmission method were 412.5 GM in the solution of CH2Cl2 and 288.8 GM in the solution of THF. The absorption, one-photon fluorescence, fluorescence lifetime, and excitation-emission-fluorescence intensity 3D spectrum have been investigated. When pumped with 800 nm femtosecond laser irradiation, chromophore PyPASPO show strong two-photon excited green fluorescence at 571 nm in CH2Cl2 and at 525 nm in THF, respectively. In CH2Cl2 the maximum peaks of single-photon-excited fluorescence was at 532 nm and the fluorescence lifetime was 1.24 ns . The electrochemical properties was explored by cyclic voltammetry. The HOMO energy level was -5.21eV and the LUMO energy level was -2.92 eV. Enhancing the charge transfer extent has been adapted to increase the two-photon absorption and upconversion fluorescence emission of the star-shaped pyridine chromophore.

Key words: star-shaped chromophore, pyridine derivative, two-photon absorption cross sections, nonlinear transmission, two photon upconversion fluorescence, frontier molecular orbital

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