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 Jan 2023
First published
30 Jan 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

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