Photoluminescence enhancement of quantum dots on Ag nanoneedles |
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Authors: | Syed Rahin Ahmed Hee Ryoung Cha Jung Youn Park Enoch Y Park Dongyun Lee Jaebeom Lee |
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Affiliation: | 1.Department of Nano Fusion Technology, College of Nanoscience and Nanotechnology, Pusan National University, Miryang, 627-706, Korea;2.National Fisheries Research and Development Institute, Busan, 619-705, Korea;3.Graduate School of Science and Technology, Shizuoka University, 836 Ohya Suruga-ku, Shizuoka, 422-8529, Japan |
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Abstract: | ABSTRACT: Noble-metal nanostructure allows us to tune optical and electrical properties, which has high utility for real-world application. We studied surface plasmon induced emission of semiconductor quantum dots (QDs) on engineered metallic nanostructures. Highly passive organic ZnS capped CdSe QDs were spin coated on poly-(methyl methacrylate) (PMMA) covered Ag films which brought QDs near to metallic surface. We obtained the enhanced electromagnetic field and reduced fluorescence lifetimes from CdSe/ZnS quantum dots (QDs) due to the strong coupling of emitters wave function with the Ag plasmon resonance. Observed changes include a six-fold increase in the fluorescence intensity and striking reduction in fluorescence lifetimes of CdSe/ZnS QDs on rough Ag nanoneedle compared to the case of smooth surfaces. The advantages of using those nanocomposites are expected for high efficiency light-emitting diodes, platform fabrication of biological and environmental monitoring, and high contrast imaging. |
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Keywords: | Ag nanoneedle film Nanostructure Fluorescence Quantum dots Plasmon-induced enhancement Surface roughness |
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