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

Chem. J. Chinese Universities ›› 2011, Vol. 32 ›› Issue (10): 2441.

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

QIAN Ying^1*, LÜ Xin-Ming¹, 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:2010-10-20 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.

Abstract

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

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QIAN Ying*, Lü Xin-Ming, ZHOU Zhi-Qiang, CUI Yi-Ping. Multiphoton Pumped Green Fluorescence in a Hyperbranched Triphenylamine-oxadiazole Conjugated Polymer[J]. Chem. J. Chinese Universities, 2011, 32(10): 2441.

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

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