Recent Progress on Quantum Dot Patterning Technologies for Commercialization of QD‐LEDs: Current Status, Future Prospects, and Exploratory Approaches

Abstract

Colloidal quantum dots (QDs) are widely regarded as advanced emissive materials with significant potential for display applications owing to their excellent optical properties such as high color purity, near‐unity photoluminescence quantum yield, and size‐tunable emission color. Building upon these attractive attributes, QDs have successfully garnered attention in the display market as down‐conversion luminophores and now venturing into the realm of self‐emissive displays, exemplified by QD light‐emitting diodes (QD‐LEDs). However, despite these advancements, there remains a relatively limited body of research on QD patterning technologies, which are crucial prerequisites for the successful commercialization of QD‐LEDs. Thus, in this review, an overview of the current status and prospects of QD patterning technologies to accelerate the commercialization of QD‐LEDs is provided. Within this review, a comprehensive investigation of three prevailing patterning methods: optical lithography, transfer printing, and inkjet printing are conducted. Furthermore, several exploratory QD patterning techniques that offer distinct advantages are introduced. This study not only paves the way for successful commercialization but also extends the potential application of QD‐LEDs into uncharted frontiers.

Solution-Processed Thick Hole-Transport Layer for Reliable Quantum-Dot Light-Emitting Diodes Based on an Alternatingly Doped Structure

“…Quantum-dot light-emitting diodes (QLEDs) have garnered attention as next-generation light-emitting-diodes (LEDs) due to their beneficial properties, tunable spectra, wide color gamut, high color purity, cost-effective processing, and excellent optoelectronic characteristics. − However, Cd-based QLEDs have limitations due to their toxicity, , leading to the development of Cd-free quantum dots (QDs), such as InP, − ZnSeTe, − and AgInS 2 QDs, − as alternative materials.…”