Surface plasmon enhanced light emission from semiconductor materials

physica status solidi (c) 07/2008; 5(9):2822--2824. DOI: 10.1002/pssc.200779287


Surface plasmon (SP) coupling technique was used to enhance light emissions from semiconductor nanocrystals with evaporated metal layers. We found that the SP coupling can increase the internal quantum efficiencies (IQE) of emission from CdSe-based nanocrystals regardless of the initial efficiencies. This suggests that this technique should be much effective for various materials that suffer from low quantum efficiencies. We also obtained 70-fold enhancement of emission from silicon nanocrystals in silicon dioxide. Obtained IQE value is 38

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    • "However, most research was related to thin metallic film. Very few researches have dealt with the relationship between surface roughness and plasmon-induced photoluminescence (PL) enhancement, even though the roughness of the metallic surface should be a crucial factor for effectively manipulating the interaction between metallic and semiconducting materials in nanoscale devices [12-20]. "
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    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)-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.
    Nanoscale Research Letters 08/2012; 7(1):438. DOI:10.1186/1556-276X-7-438 · 2.78 Impact Factor
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    • "It has been shown that close proximity to surface plasmon polaritons (SPPs) on surfaces and localized surface plasmons (SPs) in nanoparticles can strongly enhance observed emission intensity for fluorescent materials [4]. The use of nanoparticles as mediators for enhanced fluorescence has been studied extensively in recent years and many results have been published demonstrating that high enhancements can be obtained by placing fluorophores in close proximity to these SPPs or SPs[4] [5] [6] [7] [8] [9] [10] [11] [12]. Previous work from our group has established that it is also possible to obtain strong enhancement of emission from fluorescent dyes by using planar gold films coated in PMMA, which is then patterned by electron beam lithography to produce linear gratings to facilitate coupling to SPPs "
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    ABSTRACT: We experimentally demonstrate the enhancement of fluorescence from quantum dots excited by interaction with surface plasmon polaritons on nanostructured metal surfaces. The relationship between observed enhancement and geometrical factors of the surface structure has been used to explore the behavior of quantum dots on different substrates. Imaging using standard fluorescence optical microscopy clearly demonstrates a strong dependence of fluorescence enhancement on fundamental parameters for periodic surface structures.
    Nano Letters 03/2010; 10(3):813-20. DOI:10.1021/nl9031692 · 13.59 Impact Factor
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    ABSTRACT: A novel method to enhance light emission efficiencies from solid-state materials was developed by the use of surface plasmon (SP). A 17-fold increase in the photoluminescence (PL) intensity along with a 7-fold increase in the internal quantum efficiency (IQE) of light emission from InGaN/GaN quantum wells (QWs) was obtained when nanostructured silver layers were deposited 10nm above the QWs. A 32-fold increase in the spontaneous emission rate of InGaN/GaN at 440nm probed by the time-resolved PL measurements was also observed. Likewise, both light emission intensities and rates were enhanced for organic materials, CdSe-based nanocrystals, and also Si/SiO2 nanostructures. These enhancements should be attributed to the SP coupling. Electron–hole pairs in the materials couple to electron vibrations at the metal surface and produce SPs instead of photons or phonons. This new path increases the spontaneous emission rate and the IQEs. The SP-emitter coupling technique would lead to super bright and high-speed solid-state light-emitting devices that offer realistic alternatives to conventional fluorescent light sources. KeywordsPlasmonics-Surface plasmon-Polaroiton-Light-emitting device-InGaN-Quantum well-CdSe-Quantum dot-Silicon naocrystal
    01/1970: pages 27-46;
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