科研之友
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摘要
A novel hyperbranched triphenylamine-oxadiazole fluorescence polymer (P(1)) was synthesized by Pd-catalyzed Heck reaction. Three-photon and two-photon upconversion fluorescence spectra of polymer P(1) 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 were determined by mearuring the nonlinear transmissivity at a known input intensity level. The three-photon excited fluorescence was observed with the central wavelength at 525 nm in THF, at 534 run in CH(2)Cl(2) and at 578 nm in DMF, respectively. The maximum peak of two-photon excited fluorescence was at 527 nm in THF, at 532 nm in CH(2)Cl(2) 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 P(1). The hyperbranched triphenylamine-oxadiazole conjugated alternate copolymer displayed large multi-photon absorption and strong upconversion fluorescence properties.
- 出版日期2011-10
- 单位东南大学
