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      Multi-layered CdSe/ZnS/CdSe heteronanocrystals to generate and tune white light

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      Author
      Nizamoğlu, Sedat
      Mutlugün, Evren
      Özel, Tuncay
      Demir, Hilmi Volkan
      Sapra, S.
      Gaponik, N.
      Eychmüller, A.
      Date
      2008-11
      Source Title
      Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS
      Pages
      757 - 758
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      In this study, tuneable white light generation by controlling CdSe/ZnS/CdSe core/shell/shell heteronanocrystals integrated on InGaN/GaN light emitting diodes was presented. These multilayered quantum dots, also known as onion-like heterostructures, were designed and synthesized to emit in red (around 600 nm) from the CdSe core and in green (around 550 nm) from the CdSe shell. By designing and hybridizing these red-green emitting heterostructures on blue emitting LEDs, an integrated WLEDs on a single chip was demonstrated. By controlling the number of integrated heteronanocrystals, their (x,y) tristimulus coordinates were tuned from (0.26,0.23) to (0.37,0.36), along with their corresponding correlated color temperature tuned from 27413 K to 4192 K and the luminous efficacy of their optical radiation (the ratio of the emitted luminous flux to the radiant flux) tuned from 258 lm/W to 375 lm/W. Further investigation on the change of in-film optical properties of these heteronanocrystals with respect to their in-solution emission was performed.
      Keywords
      Zinc compounds
      Light emitting diodes
      Nanocrystals
      Stimulated emission
      Optical variables control
      Temperature
      Luminescence
      Quantum dots
      Photoluminescence
      Photometry
      Permalink
      http://hdl.handle.net/11693/26770
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/LEOS.2008.4688841
      Collections
      • Department of Electrical and Electronics Engineering 3597
      • Department of Physics 2329
      • Institute of Materials Science and Nanotechnology (UNAM) 1831
      • Nanotechnology Research Center (NANOTAM) 1026
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