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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 22 — Oct. 22, 2012
  • pp: 25071–25076

Fabrication of high color rendering index white LED using Cd-free wavelength tunable Zn doped CuInS2 nanocrystals

Wonkeun Chung, Hyunchul Jung, Chang Hun Lee, and Sung Hyun Kim  »View Author Affiliations


Optics Express, Vol. 20, Issue 22, pp. 25071-25076 (2012)
http://dx.doi.org/10.1364/OE.20.025071


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Abstract

Highly luminescent Cd–free Zn doped CuInS2 nanocrystals (ZCIS NCs) were synthesized, and their properties were evaluated using X-ray diffraction, Raman, UV, and photoluminescence. The crystal structure of the ZCIS NCs was similar to the zinc blende, and the lattice constant decreased with increasing Zn concentration. By incorporation of Zn, the emission wavelength was tuned from 536 to 637nm with concomitant enhancement of the quantum yield up to 45%. A white light emitting diodes, integrating dual ZCIS NCs (λem = 567, and 617nm) and a 460nm InGaN LED, exhibited a high color rendering index of 84.1 with a warm color temperature of 4256.2K. The CIE-1931 chromaticity coordinates were slightly shifted from (0.3626, 0.3378) at 20mA to (0.3480, 0.3206) at 50mA.

© 2012 OSA

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(160.4236) Materials : Nanomaterials
(230.7405) Optical devices : Wavelength conversion devices

ToC Category:
Optical Devices

History
Original Manuscript: July 12, 2012
Revised Manuscript: September 19, 2012
Manuscript Accepted: October 9, 2012
Published: October 18, 2012

Citation
Wonkeun Chung, Hyunchul Jung, Chang Hun Lee, and Sung Hyun Kim, "Fabrication of high color rendering index white LED using Cd-free wavelength tunable Zn doped CuInS2 nanocrystals," Opt. Express 20, 25071-25076 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-22-25071


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