Employing Heavy Metal-Free Colloidal Quantum Dots in Solution-Processed White Light-Emitting Diodes

被引：195

作者：

Zhang, Yu ^{[1
,2
,3
]}

Xie, Chuang ^{[1
,4
]}

Su, Huaipeng ^{[4
]}

Liu, Jie ^{[1
]}

Pickering, Shawn ^{[1
]}

Wang, Yongqiang ^{[5
]}

Yu, William W. ^{[5
]}

Wang, Jingkang ^{[4
]}

Wang, Yiding ^{[2
,3
]}

Hahm, Jong-in ^{[6
]}

Dellas, Nicholas ^{[7
]}

Mohney, Suzanne E. ^{[7
]}

Xu, Jian ^{[1
]}

机构：

[1] Penn State Univ, Dept Engn Sci & Mech, University Pk, PA 16802 USA

[2] Jilin Univ, State Key Lab Integrated Optoelect, Changchun 130012, Peoples R China

[3] Jilin Univ, Coll Elect Sci & Engn, Changchun 130012, Peoples R China

[4] Tianjin Univ, Sch Chem Engn & Technol, State Key Lab Chem Engn, Tianjin 300072, Peoples R China

[5] Ocean NanoTech LLC, Springdale, AR 72764 USA

[6] Penn State Univ, Dept Chem Engn, University Pk, PA 16802 USA

[7] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

来源：

NANO LETTERS | 2011年 / 11卷 / 02期

基金：

美国国家科学基金会;

关键词：

Bilayer structure; heavy metal-free; quantum dots; white light-emitting diodes; aging effect; ELECTROLUMINESCENCE; NANOCRYSTALS; CDSE;

D O I：

10.1021/nl1021442

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report in this communication the design and fabrication of solution-processed white light-emitting diodes (LEDs) containing a bilayer of heavy metal-free colloidal quantum dots (QDs) and polymer in the device active region. White electroluminescence was obtained in the LEDs by mixing the red emission of ZnCuInS/ZnS core/shell QDs and the blue-green emission of poly(N,N'-bis(4-butylphenyl)-N,N'-. bis(phenyl)benzidine). A high color rendering index of 92 was achieved as compared to a 5310 K blackbody reference by virtue of broadband emission of the QDs. The Commission Internationale de l'Eclairage chromaticity coordinates of the white LED output exhibit a distinctive bias dependence. Finally, aging of the white LEDs was studied, revealing the difference between the photochemical stabilities of the QDs and polymer molecules and the consequent effect on the color evolution of the LEDs.

引用

页码：329 / 332

页数：4

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