Photoluminescence Enhancement of CdSe Quantum Dots: A Case of Organogel鈥揘anoparticle Symbiosis

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• 作者：Prashant D. Wadhavane ; Raquel E. Galian ; M. Angeles Izquierdo ; Jordi Aguilera-Sigalat ; Francisco Galindo ; Luciana Schmidt ; M. Isabel Burguete ; Julia P茅rez-Prieto ; Santiago V. Luis
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：December 19, 2012
• 年：2012
• 卷：134
• 期：50
• 页码：20554-20563
• 全文大小：472K
• 年卷期：v.134,no.50(December 19, 2012)
• ISSN：1520-5126

文摘

Highly fluorescent organogels (QD鈥搊rganogel), prepared by combining a pseudopeptidic macrocycle and different types of CdSe quantum dots (QDs), have been characterized using a battery of optical and microscopic techniques. The results indicate that the presence of the QDs not only does not disrupt the supramolecular organization of the internal fibrillar network of the organogel to a significant extent, but it also decreases the critical concentration of gelator needed to form stable and thermoreversible organogels. Regarding the photophysical properties of the QDs, different trends were observed depending on the presence of a ZnS inorganic shell around the CdSe core. Thus, while the core鈥搒hell QDs preserve their photophysical properties in the organogel medium, a high to moderate increase of the fluorescence intensity (up to 528%) and the average lifetime (up to 1.7), respectively, was observed for the core QDs embedded in the organogel. The results are relevant for the development of luminescent organogels based on quantum dots, which have potential applications as advanced hybrid materials in different fields.