Issue 4, 2023

High-efficiency and high-resolution patterned quantum dot light emitting diodes by electrohydrodynamic printing

Abstract

The development of quantum dot light-emitting diode (QLED) fabrication technologies for high-definition and low-cost displays is an important research topic. However, commercially available piezoelectric inkjet printing has reached its limit in reducing pixel sizes, which restricts its potential use in high-resolution displays. Here, we exhibit an electrohydrodynamic (EHD) printing method for manufacturing QLEDs with a high resolution of 500 ppi that remarkably surpasses the resolution of conventional inkjet printing displays. By optimizing the EHD printing process, a high-resolution pixelated bottom-emitting passive matrix QLED with a maximal current efficiency of 14.4 cd A−1 in a pixel size of 5 μm × 39 μm was achieved, indicating the capability of the EHD method in superfine printing and high efficiency QLED. Moreover, a top-emitting device is designed using a capping layer; the maximal current efficiency of top-emission passive matrix QLED devices can reach up to 16.5 cd A−1. Finally, a two-color (red and green) bottom-emission QLED device with 500 ppi was fabricated. The successful fabrication of these high-efficiency QLEDs with 500 ppi demonstrated that the EHD printing strategy has numerous potential applications in high-resolution and high-performance QLEDs for a range of applications, such as mobile or wearable devices.

Graphical abstract: High-efficiency and high-resolution patterned quantum dot light emitting diodes by electrohydrodynamic printing

Supplementary files

Article information

Article type
Paper
Submitted
28 Nov. 2022
Accepted
12 Janv. 2023
First published
30 Janv. 2023
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2023,5, 1183-1189

High-efficiency and high-resolution patterned quantum dot light emitting diodes by electrohydrodynamic printing

H. Wang, Y. Zhang, Y. Liu, Z. Chen, Y. Li, X. Li and X. Xu, Nanoscale Adv., 2023, 5, 1183 DOI: 10.1039/D2NA00862A

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, 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 commercial 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