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

被引：119

作者：

Song, Woo-Seuk ^{[1
]}

Kim, Jong-Hoon ^{[1
]}

Lee, Jeong-Hoon ^{[1
]}

Lee, Hye-Seung ^{[1
]}

Do, Young Rag ^{[2
]}

Yang, Heesun ^{[1
]}

机构：

[1] Hongik Univ, Dept Mat Sci & Engn, Seoul 121791, South Korea

[2] Kookmin Univ, Dept Chem, Seoul 136702, South Korea

来源：

JOURNAL OF MATERIALS CHEMISTRY | 2012年 / 22卷 / 41期

基金：

新加坡国家研究基金会;

关键词：

SEMICONDUCTOR NANOCRYSTALS; CUINS2; NANOCRYSTALS; BAND-GAP; EFFICIENCY; PHOSPHOR; PHOTOLUMINESCENCE; NONINJECTION; PERFORMANCE; DROOP; SIZE;

D O I：

10.1039/c2jm35150a

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Synthesis and application of I-III-IV 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 69.1-75.01m 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.

引用

页码：21901 / 21908

页数：8

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