Issue 30, 2016
From the journal:

Journal of Materials Chemistry C

High-efficiency deep-red quantum-dot light-emitting diodes with type-II CdSe/CdTe core/shell quantum dots as emissive layers†

Qingli Lin,ab   Bin Song,b   Hongzhe Wang,*b   Fengjuan Zhang,b   Fei Chen,b   Lei Wang,b   Lin Song Li,b   Fang Guo*a  and  Huaibin Shen*b  

* Corresponding authors

a College of Chemistry, Liaoning University, Shenyang 110036, China
E-mail: fguo@lnu.edu.cn

b Key Laboratory for Special Functional Materials of Ministry of Education, Henan University, Kaifeng 475004, China
E-mail: whz@henu.edu.cn, shenhuaibin@henu.edu.cn

Abstract

We report a type of highly efficient deep-red light-emitting diode based on type-II CdTe/CdSe core/shell quantum dots (QDs). High-quality CdTe/CdSe core/shell QDs with three different photoluminescence emissions peaked at 642, 664 and 689 nm are, respectively, synthesized through a green process. Correspondingly, three devices employing QDs with different PL peaks show the maximum external quantum efficiency (EQE) of 5.24%, 5.74% and 6.19% with a low turn-on voltage of about 1.8 V, respectively. Interestingly, EQE is kept above 5% in a certain range of luminance (from 101 to 103 cd m−2). To our knowledge, this is the first report that uses type-II core/shell QDs as deep-red emitters and these results may offer a practicable reference for applications that require a high efficiency deep-red illuminant.

Graphical abstract: High-efficiency deep-red quantum-dot light-emitting diodes with type-II CdSe/CdTe core/shell quantum dots as emissive layers

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Article information

DOI
https://doi.org/10.1039/C6TC01531J
Article type
Paper
Submitted
15 Apr 2016
Accepted
07 Jun 2016
First published
08 Jun 2016

J. Mater. Chem. C, 2016,4, 7223-7229

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High-efficiency deep-red quantum-dot light-emitting diodes with type-II CdSe/CdTe core/shell quantum dots as emissive layers

Q. Lin, B. Song, H. Wang, F. Zhang, F. Chen, L. Wang, L. S. Li, F. Guo and H. Shen, J. Mater. Chem. C, 2016, 4, 7223 DOI: 10.1039/C6TC01531J

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