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

Wonkeun Chung, Hyunchul Jung, Chang Hun Lee, Sung Hyun Kim

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Highly luminescent Cd-free Zn doped CuInS2 nanocrystals (ZCIS NCs) were synthesized, and their properties were evaluated using Xray 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.

Original languageEnglish
Pages (from-to)25071-25076
Number of pages6
JournalOptics Express
Issue number22
Publication statusPublished - 2012 Oct 22


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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