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      Onion-Like (CdSe)ZnS/CdSe/ZnS quantum-dot-quantum-well heteronanocrystals for investigation of multi-color emission

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      Author(s)
      Nizamoglu, S.
      Demir, Hilmi Volkan
      Date
      2008
      Source Title
      Optics Express
      Print ISSN
      1094-4087
      Publisher
      Optical Society of America
      Volume
      16
      Issue
      6
      Pages
      3515 - 3526
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      We investigate multi-color spontaneous emission from quantum-dot-quantum-well heteronanocrystals made of onion-like (CdSe) ZnS/CdSe/ZnS ( core) shell/shell/shell structures, with our theoretical results explaining experimental measurements for the first time. In such multi-layered heteronanocrystals, we discover that the carrier localization is tuned from type-1-like to type-2-like localization by controlling CdSe and ZnS shell thicknesses, and that 3-monolayer ZnS barriers are not necessarily sufficient for carrier localization, unlike in conventional ( CdSe) ZnS ( core) shell structures. We demonstrate that exciton localization in distinct layers of ( CdSe) ZnS/CdSe/ZnS heteronanocrystals with high transition probability ( for n=1 states in CdSe core and n=2 states in CdSe shell) is key to their multi-color emission. (c) 2008 Optical Society of America.
      Keywords
      White-light Generation
      Inverted Core/shell Nanocrystals
      Semiconductor Nanocrystals
      Systems
      Znse
      Permalink
      http://hdl.handle.net/11693/11660
      Published Version (Please cite this version)
      http://dx.doi.org/10.1364/OE.16.003515
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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