Issue 28, 2024

Enhancing the efficiency and stability of ZnSe pure blue quantum dot light-emitting diodes via ionic liquid doping

Abstract

Quantum dot light-emitting diodes (QLEDs) are emerging as promising candidates for next-generation displays, with the current efficiency and stability of both red and green QLEDs meeting display requirements. However, the efficiency and stability of blue QLEDs, particularly pure blue iterations, significantly lag behind those of their red and green counterparts, thus hindering the widespread adoption of full-color QLEDs. Here, we introduce a strategy to improve the efficiency and stability of pure blue zinc selenide (ZnSe) QLEDs by adding a new ionic liquid (IL) salt, 1-butyl-3-methylimidazolium phosphorus hexafluoride (BMIMPF6), into the hole transport layer (HTL). This IL salt acts as an effective p-dopant, enhancing charge mobility while also increasing the surface potentials of the HTL for better alignment of energy bands at the interface. This results in a significant improvement in device performance, with the external quantum efficiency (EQE) increasing from 4.90% to 7.02%, setting a high performance for cadmium-free pure-blue ZnSe QLEDs. Additionally, the device's operational lifetime, measured as the time taken for luminance to drop to 50% (T50) at 100 cd m−2, sees a remarkable six-fold increase, reaching 177 hours. Our work represents a significant advancement in developing cadmium-free pure-blue ZnSe QLEDs and offers valuable insights for designing efficient and stable quantum dot-based displays.

Graphical abstract: Enhancing the efficiency and stability of ZnSe pure blue quantum dot light-emitting diodes via ionic liquid doping

Supplementary files

Article information

Article type
Paper
Submitted
08 Mai 2024
Accepted
11 Jun 2024
First published
12 Jun 2024

J. Mater. Chem. C, 2024,12, 10408-10416

Enhancing the efficiency and stability of ZnSe pure blue quantum dot light-emitting diodes via ionic liquid doping

L. Lin, X. Ye, Z. Luo, W. Chen, T. Guo, H. Hu and F. Li, J. Mater. Chem. C, 2024, 12, 10408 DOI: 10.1039/D4TC01874E

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