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      Energy-saving quality road lighting with colloidal quantum dot nanophosphors

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      Author(s)
      Erdem, T.
      Kelestemur, Y.
      Soran-Erdem, Z.
      Ji, Y.
      Demir, Hilmi Volkan
      Date
      2014
      Source Title
      Nanophotonics
      Print ISSN
      21928606
      Publisher
      Walter de Gruyter GmbH
      Volume
      3
      Issue
      6
      Pages
      373 - 381
      Language
      English
      Type
      Article
      Item Usage Stats
      223
      views
      211
      downloads
      Abstract
      Here the first photometric study of road-lighting white light-emitting diodes (WLEDs) integrated with semiconductor colloidal quantum dots (QDs) is reported enabling higher luminance than conventional light sources, specifically in mesopic vision regimes essential to street lighting. Investigating over 100 million designs uncovers that quality road-lighting QD-WLEDs, with a color quality scale and color rendering index ≥85, enables 13-35% higher mesopic luminance than the sources commonly used in street lighting. Furthermore, these QD-WLEDs were shown to be electrically more efficient than conventional sources with power conversion efficiencies ≥16-29%. Considering this fact, an experimental proof-of-concept QD-WLED was demonstrated, which is the first account of QD based color conversion custom designed for street lighting applications. The obtained white LED achieved the targeted mesopic luminance levels in accordance with the road lighting standards of the USA and the UK. These results indicate that road-lighting QD-WLEDs are strongly promising for energy-saving quality road lighting. © 2014 Science Wise Publishing & De Gruyter 2014.
      Keywords
      light-emitting diodes (LEDs)
      mesopic vision
      outdoor lighting
      photometric design
      quantum dots (QDs)
      Color
      Energy conservation
      Light sources
      Luminance
      Photometry
      Roads and streets
      Semiconductor diodes
      Semiconductor quantum dots
      Street lighting
      Transportation
      Colloidal quantum dots
      Color conversions
      Color rendering index
      Conventional light sources
      Lighting applications
      Mesopic vision
      Power conversion efficiencies
      White lightemitting diodes (WLEDs)
      Light emitting diodes
      Permalink
      http://hdl.handle.net/11693/24847
      Published Version (Please cite this version)
      http://dx.doi.org/10.1515/nanoph-2014-0016
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      • Department of Electrical and Electronics Engineering 3868
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