White-Light-Emitting Self-Assembled NanoFibers and Their Evidence by Microspectroscopy of Individual Objects

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• 作者：Carlo Giansante ; Guillaume Raffy ; Christian Sch盲fer ; Hakim Rahma ; Min-Tzu Kao ; Alexandre G. L. Olive ; Andr茅 Del Guerzo
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：January 19, 2011
• 年：2011
• 卷：133
• 期：2
• 页码：316-325
• 全文大小：617K
• 年卷期：v.133,no.2(January 19, 2011)
• ISSN：1520-5126

文摘

The self-assembly of a blue-emitting light-harvesting organogelator and specifically designed highly fluorescent tetracenes yields nanofibers with tunable emissive properties. In particular, under near-UV excitation, white light emission is achieved in organogels and dry films of nanofibers. Confocal fluorescence microspectroscopy demonstrates that each individual nanofiber emits white light. A kinetic study shows that an energy transfer (ET) occurs between the blue-emitting anthracene derivative and the green- and red-emitting tetracenes, while inter-tetracene ETs also take place. Moreover, microscopy unravels that the nanofibers emit polarized emission in the blue spectral region, while at wavelengths higher than 500 nm the emission is not significantly polarized.