Issue 41, 2012

Synthesis of color-tunable Cu–In–Ga–S solid solution quantum dots with high quantum yields for application to white light-emitting diodes

Abstract

Synthesis and application of I–III–VI type Cu–In–Ga–S (CIGS) quantum dots (QDs) with varied In : Ga ratios to a white light-emitting diode (LED) are reported. The band gap and emission energies of CIGS QDs are found to be systematically higher with increasing Ga content as a result of an appropriate formation of CIS–CGS solid solution. ZnS shell-capped QDs of the CIGS/ZnS core–shell emit quite tunable wavelengths of 520–578 nm with exceptionally high photoluminescence quantum yield of 72–83%, depending on the composition. By combining highly fluorescent CIGS/ZnS QDs as color converters with a blue-emitting LED, efficient white QD-based LEDs with high luminous efficacies of 69.1–75.0 lm W−1 at a forward current of 20 mA are fabricated. A white QD-LED with an enhanced color rendering property is further developed by choosing and blending two kinds of CIGS/ZnS QDs, and its electroluminescent properties are characterized in detail as a function of applied current.

Graphical abstract: Synthesis of color-tunable Cu–In–Ga–S solid solution quantum dots with high quantum yields for application to white light-emitting diodes

Supplementary files

Article information

Article type
Paper
Submitted
02 Aug 2012
Accepted
06 Sep 2012
First published
06 Sep 2012

J. Mater. Chem., 2012,22, 21901-21908

Synthesis of color-tunable Cu–In–Ga–S solid solution quantum dots with high quantum yields for application to white light-emitting diodes

W. Song, J. Kim, J. Lee, H. Lee, Y. R. Do and H. Yang, J. Mater. Chem., 2012, 22, 21901 DOI: 10.1039/C2JM35150A

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