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

doi:10.1364/OE.20.025071

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

Research output: Contribution to journal › Article › peer-review

33 Citations (Scopus)

Abstract

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 (λ_em = 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 language	English
Pages (from-to)	25071-25076
Number of pages	6
Journal	Optics Express
Volume	20
Issue number	22
DOIs	https://doi.org/10.1364/OE.20.025071
Publication status	Published - 2012 Oct 22

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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

abstract = "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.",

author = "Wonkeun Chung and Hyunchul Jung and Lee, {Chang Hun} and Kim, {Sung Hyun}",

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AU - Jung, Hyunchul

AU - Lee, Chang Hun

AU - Kim, Sung Hyun

PY - 2012/10/22

Y1 - 2012/10/22

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AB - 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.

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

Abstract

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