Luminescence Enhancement, Encapsulation, and Patterning of Quantum Dots Toward Display Applications

Abstract

Quantum dots (QDs) are semiconductor nanoparticles (NPs) that have gained significant interest in the academia and industry because of their unique optoelectronic properties such as tunable emission wavelength, high color purity, wide color gamut, and high photoluminescence quantum yield. However, it remains a challenge to fabricate a QD colloid or solution into solid devices featuring the desired patterns and maintaining high efficiency. Recently, researchers have shown significant progress in the efficiency improvement and device fabrication of QD-based displays, contributed by the development of both materials and device engineering. In this review, the recent progress in the engineering of QDs will be discussed, with an emphasis on the encapsulation methods and patterning strategies by which QDs are packaged into solid-state devices with pixelated patterns as well as luminescence enhancement and modulation.

Highly luminescent perovskite quantum dots for light-emitting devices: photopatternable perovskite quantum dot–polymer nanocomposites

“…The preparation of optoelectronic devices incorporating PeQDs often requires patterning processes. 2 Among the available patterning methods, printing approaches, including transfer printing and inkjet-printing, have great promise, but achieving fine features with high quality and uniformity can be very difficult. 13,14 Photolithography is an alternative manufacturing process that relies on photoresists (PRs) changing their solubility after illumination.…”

“…Perovskite quantum dots (PeQDs) are attractive for many reasons, including their high photoluminescence quantum yields (PLQYs), high color purity, color-tunability and low fabrication costs. [1][2][3] As such, they are promising candidates for use as light emitters in many applications, including quantum dot light-emitting diodes (QD-LEDs), 4,5 quantum dot (QD) solar cells, 6 QD enhancement films, 7 QD color filters, 8 and singlephoton light sources. 9,10 Nevertheless, the greatest challenge in commercializing emerging technologies based on PeQDs is their poor stability.…”

Tailored ZnO Functional Nanomaterials for Solution‐Processed Quantum‐Dot Light‐Emitting Diodes

“…[ 1 ] Alongside taking full advantage of excellent solution processability, ultranarrowband emission of core/shell CQDs makes them highly desirable for large‐area flexible smart displays. [ 2 ] In terms of the emission spectrum and color gamut, QLEDs are superior to organic light‐emitting diodes (OLEDs) that exhibit broader electroluminescence (EL) spectra. [ 3 ] Additionally, falling into the category of “printed diodes”, [ 4 ] the QLED technology is currently paving the way toward industry‐scale large‐area manufacturing.…”

“…Thus far, several reviews, perspectives, and progress reports have highlighted the recent advancements in the CQD synthetic chemistry, [ 13 ] fundamental and spectroscopic aspects of CQDs, [ 14 ] CQD colloidal stability, [ 15 ] QLED device fabrication, and engineering methods for improving the efficiency [2a] . In addition, relevant printing technologies for realizing flexible QLED smart displays have also been published [2b,d,16] . However, there has been no comprehensive review on the critical role of the other charge transport layers in these devices.…”

Synergy of Block Copolymers and Perovskites: Template Growth through Self-Assembly

“…This has boosted the development and improvement of perovskite-based applications, with perovskite solar cells (PSCs) obtaining certified efficiency over 25% , and perovskite light-emitting diodes (PeLEDs) reserving external quantum efficiencies over 20% in green, red and near-infrared emissions . However, there are still strong demands for enhancing the stability of materials and devices , as well as realizing efficient, harmless and cost-effective nanopatterning methods to produce perovskites with various nanostructures for different applications. , …”