Trans/cis-isomerization of fluorene-bridged azo chromophore with significant two-photon absorbability at near-infrared wavelength

Chih Chien Chu, Ya Chi Chang, Bo Kai Tsai, Tzu Chau Lin, Ja Hon Lin, Vincent K.S. Hsiao

研究成果: 雜誌貢獻期刊論文同行評審

14 引文 斯高帕斯(Scopus)

摘要

Azo-containing materials have been proven to possess second-order nonlinear optical (NLO) properties, but their third-order NLO properties, which involves twophoton absorption (2PA), has rarely been reported. In this study, we demonstrate a significant 2PA behavior of the novel azo chromophore incorporated with bilateral diphenylaminofluorenes (DPAFs) as a π framework. The electrondonating DPAF moieties cause a redshifted π-π∗ absorption band centered at 470 nm, thus allowing efficient blue-lightinduced trans-to-cis photoisomerization with a rate constant of 2.04×10-1 min-1 at the photostationary state (PSS). The open-aperture Z-scan technique that adopted a femtosecond (fs) pulse laser as excitation source shows an appreciably higher 2PA cross-section for the fluorene-derived azo chromophore than that for common azobenzene dyes at near-infrared wavelength (λex=800 nm). Furthermore, the fs 2PA response is quite uniform regardless of the molecular geometry. On the basis of the computational modeling, the intramolecular charge-transfer (ICT) process from peripheral diphenylamines to the central azo group through a fluorene p bridge is crucial to this remarkable 2PA behavior.

原文???core.languages.en_GB???
頁(從 - 到)3390-3396
頁數7
期刊Chemistry - An Asian Journal
9
發行號12
DOIs
出版狀態已出版 - 12月 2014

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