Surface plasmon enhanced light emission from semiconductor materials

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

ABSTRACT 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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    • "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
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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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    ABSTRACT: Surface plasmon coupling was used to enhance light-emission from InGaN/GaN quantum wells. Huge enhancements which depend on emission wavelength were observed and the possible enhancement mechanism was represented by using the 3D-FDTD simulations.
    IEEE Lasers and Electro-Optics Society, 2008. LEOS 2008. 21st Annual Meeting of the; 01/2008
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