Issue 10, 2019

All-solution processed inverted green quantum dot light-emitting diodes with concurrent high efficiency and long lifetime

Abstract

All-solution processed inverted quantum dot light-emitting diodes (QLEDs) are promising candidates for lighting and display applications. While the external quantum efficiency of inverted devices is comparable to that of devices with normal structure, achieving both high efficiency and long lifetime in such inverted devices remains challenging. Herein, we report an all-solution processed inverted green QLED capable of achieving a 96.42 cd A−1 current efficiency, a 25.04% external quantum efficiency, and a 4943.6 h half-lifetime. This external quantum efficiency exceeds reported literature values, and the lifetime is over 19 times greater than those of previously reported all-solution processed inverted QLEDs. Such excellent performance is attributed to the precisely controlled double ZnS shells of CdSeZnS/ZnS/ZnS quantum dots, which can effectively suppress Auger recombination and Förster resonance energy transfer, as well as decrease efficiency roll-off at high driving currents. Overall, this study suggests that shell engineering of quantum dots may provide an effective means of accelerating the inverted QLEDs to meet requirements for practical display and lighting applications.

Graphical abstract: All-solution processed inverted green quantum dot light-emitting diodes with concurrent high efficiency and long lifetime

Supplementary files

Article information

Article type
Communication
Submitted
08 jul 2019
Accepted
12 aug 2019
First published
12 aug 2019

Mater. Horiz., 2019,6, 2009-2015

All-solution processed inverted green quantum dot light-emitting diodes with concurrent high efficiency and long lifetime

Z. Yang, Q. Wu, G. Lin, X. Zhou, W. Wu, X. Yang, J. Zhang and W. Li, Mater. Horiz., 2019, 6, 2009 DOI: 10.1039/C9MH01053J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements