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      Hybrid white light sources based on layer-by-layer assembly of nanocrystals on near-UV emitting diodes

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      Author(s)
      Nizamoglu, S.
      Demir, Hilmi Volkan
      Date
      2007-09-17
      Source Title
      Nanotechnology
      Print ISSN
      0957-4484
      Electronic ISSN
      1361-6528
      Publisher
      Institute of Physics Publishing Ltd.
      Volume
      18
      Issue
      40
      Pages
      405702-4 - 405702-1
      Language
      English
      Type
      Article
      Item Usage Stats
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      242
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      Abstract
      We present the design, growth, fabrication, integration and characterization of alternative hybrid white light sources based on the controlled layer-by-layer assembly of nanocrystals on UV-emitting nitride diodes for adjustable white light parameters. We hybridize CdSe/ZnS core–shell nanocrystals of different sizes (1.9–3.2–5.2 nm) on InGaN/GaN LEDs as a near-UV excitation source at 383 nm for efficient pumping. The first device includes layer-by-layer assembly of dichromatic cyan- and red-emitting nanocrystals (λPL = 504–615 nm) leading to the tristimulus coordinates (x = 0.37,y = 0.46); the second device uses the trichromatic combination of layer-by-layer hybridized cyan-, yellow- and red-emitting nanocrystals (λPL = 504–580–615 nm), yielding (x = 0.38,y = 0.48). Such layer-by-layer hybridization offers the advantages of precisely controlling individual nanocrystal film thicknesses and order in addition to concentrations. By utilizing such multiple combinations of nanocrystals in the assembly, the light parameters are well controlled and adjusted. Leveraging rapidly advancing UV technology into efficient lighting with nanocrystal based color conversion, it is critical to develop and demonstrate hybrid light sources on UV pumping platforms.
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      http://hdl.handle.net/11693/49197
      Published Version (Please cite this version)
      https://doi.org/10.1088/0957-4484/18/40/405702
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
      • Nanotechnology Research Center (NANOTAM) 1179
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