Journal
NANOSCALE RESEARCH LETTERS
Volume 7, Issue -, Pages -Publisher
SPRINGEROPEN
DOI: 10.1186/1556-276X-7-438
Keywords
Ag nanoneedle film; Nanostructure; Fluorescence; Quantum dots; Plasmon-induced enhancement; Surface roughness
Funding
- Korea Healthcare Technology RD Project [A080854]
- Ministry for Health, Welfare Family Affairs
- National Fisheries Research & Development Institute [RP-2012-BT-025]
- New & Renewable Energy program of the KETEP grant [20103020010050]
- Ministry of Knowledge Economy
- International Research and Development Program of the National Research Foundation
- Ministry of Education, Science and Technology, Republic of Korea
- Converging Research Center Program through the Ministry of Education, Science and Technology [2012 K001270]
- Korea Health Promotion Institute [A080854, A110191] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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)-covered Ag films, which brought QDs near the metallic surface. We obtained the enhanced electromagnetic field and reduced fluorescence lifetimes from CdSe/ZnS QDs due to the strong coupling of emitter 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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