Article ID Journal Published Year Pages File Type
177095 Dyes and Pigments 2011 6 Pages PDF
Abstract

Novel triphenylamine-based dendrimers were synthesized and characterized by FT-IR, elemental analysis, 1H NMR spectroscopy, and MALDI-TOF mass spectrometry. The linear photophysical properties including absorption, one-photon induced fluorescence and the fluorescence lifetimes in different solvents were investigated. The two-photon induced fluorescence behavior was recorded in toluene solution, employing a Ti:sapphire femtosecond laser pulse. The dendrimers both emit strong blue–green fluorescence under irradiation. Two-photon excited state fluorescence cross-sections were also obtained. The two dendrimers displayed a large two-photon absorption. The polytriphenylamine dendrimer shows larger two-photon excited state fluorescence cross-sections in toluene relative to the tristriphenylamine analog, indicating that there is cooperative enhancement originating from inter-branch coupling and an increase of light-harvesting ability with increasing dendrimer size.

Research highlights► Novel triphenylamine-based dendrimers were synthesized and characterized. ► Photophysical properties and two-photon induced fluorescence were investigated. ► Two-photon absorption cross-section of dendrimers were obtained. ► We find evidence how inter-branch coupling results in cooperative enhancement.

Related Topics
Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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