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Color-converting combinations of nanocrystal emitters for warm-white light generation with high color rendering index

Appl. Phys. Lett. 92, 031102 (2008); doi:10.1063/1.2833693

Published 22 January 2008

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Sedat Nizamoglu, Gulis Zengin, and Hilmi Volkan Demir
Department of Electrical and Electronics Engineering, Department of Physics, and Nanotechnology Research Center, Bilkent University, Ankara TR-06800, Turkey
Warm-white light emitting diodes with high color rendering indices are required for the widespread use of solid state lighting especially indoors. To meet these requirements, we propose and demonstrate warm-white hybrid light sources that incorporate the right color-converting combinations of CdSe/ZnS core-shell nanocrystals hybridized on InGaN/GaN LEDs for high color rendering index. Three sets of proof-of-concept devices are developed to generate high-quality warm-white light with (1) tristimulus coordinates (x,y)=(0.37,0.30), luminous efficacy (LE)=307  lm/W, color rending index (CR)=82.4, and correlated color temperature (CCT)=3228  K; (2) (x,y)=(0.38,0.31), LE=323  lm/W, CRI=81.0, and CCT=3190  K; and (3) (x,y)=(0.37,0.30), LE=303  lm/W, CRI=79.6, and CCT=1982  K. ©2008 American Institute of Physics
History: Received 29 November 2007; accepted 19 December 2007; published 22 January 2008
Permalink: http://link.aip.org/link/?APPLAB/92/031102/1
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KEYWORDS and PACS

Keywords
PACS
  • 42.72.-g
    Optical sources and standards
  • 07.60.Dq
    Photometers, radiometers, and colorimeters
  • 85.60.Jb
    Light-emitting devices
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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