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

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (4): 868.

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

QIAN Ying^1*, LIN Guo-Qiang¹, ZHOU Zhi-Qiang², CUI Yi-Ping²

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.

Abstract

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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QIAN Ying*, LIN Guo-Qiang, ZHOU Zhi-Qiang, CUI Yi-Ping. Two-photon Upconversion Fluorescence Property in a Star-shaped Pyridine Chromophore[J]. Chem. J. Chinese Universities, 2011, 32(4): 868.

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

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