Fabrication of light emitting diodes using photo-patternable quantum dot-acrylate resins

Yang, Kab Pil; Son, Seung-Rak; Baek, Seon Hui; Lee, Jun Hyup; Lee, Kangtaek

doi:10.1039/d1tc04787f

Cited by 5 publications

(4 citation statements)

References 19 publications

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“…Among these options, acrylic-based resin has been a prevailing choice in the industry for several decades due to features such as its low cost, transparency, and versatility in adjustable functionality. Notably, acrylic resin exhibits excellent chemical compatibility with the hydrophobic nature of QDs, facilitating their effective incorporation with QDs in various applications [27,28].…”

Section: Characterizationmentioning

confidence: 99%

General Strategies for Preparing Hybrid Polymer/Quantum Dot Nanocomposites for Color Conversion

Chen,

Lin,

Chen

et al. 2023

Nanomaterials

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Quantum dots (QDs), with their exceptional optical properties, have emerged as promising candidates to replace traditional phosphors in lighting and display technologies. This study delves into the integration strategies of QDs within glass and polymer matrices to engineer advanced quantum dot color converters (QDCCs) at the industrial scale for practical applications. To achieve enhancements in the photostability and thermal stability of QDCCs, we explore two distinct approaches: the dispersion of QDs in a hydrophilic glass matrix via a sol–gel process and the incorporation of QDs into a non-polar acrylate monomer to formulate QD/polymer nanocomposites. This research further investigates the optical behaviors of these composites, focusing on their light-scattering and propagation mechanisms, which are critical for optimizing light extraction efficiency in QDCCs. Additional optical film and light-scattering particles can improve color conversion efficiency by ~140%. These advancements present a significant step forward in the development of high-performance, energy-efficient, QD-based lighting and display systems.

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Section: Characterizationmentioning

confidence: 99%

General Strategies for Preparing Hybrid Polymer/Quantum Dot Nanocomposites for Color Conversion

Chen,

Lin,

Chen

et al. 2023

Nanomaterials

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“…Simply dispersing QDs with common photolithography or stereolithography resins is therefore not straightforward and can result in aggregation or segregation of the QDs in the organic matrix. 14 As a result, direct photolithography or stereolithography of QDs has often been reported for waterbased systems, 15,16 but such an approach is not compatible with the implementation of oxygen and water vapor barriers. In addition, although depositing thick films of resin by blade coating is relatively easy, maximizing the loading of a QD-resin is highly desirable to minimize the thickness of the colorconverting layer, while maintaining high optical densities.…”

Section: Introductionmentioning

confidence: 99%

“…However, highly emissive QDs are usually synthesized with aliphatic ligands, whereas resins are typically blends of rather polar acrylate-based monomers and crosslinkers. Simply dispersing QDs with common photolithography or stereolithography resins is therefore not straightforward and can result in aggregation or segregation of the QDs in the organic matrix . As a result, direct photolithography or stereolithography of QDs has often been reported for water-based systems, , but such an approach is not compatible with the implementation of oxygen and water vapor barriers.…”

Section: Introductionmentioning

confidence: 99%

Quantum Dot Patterning and Encapsulation by Maskless Lithography for Display Technologies

Özdemir

Avermaet

Erdem

et al. 2023

ACS Appl. Mater. Interfaces

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For their unique optical properties, quantum dots (QDs) have been extensively used as light emitters in a number of photonic and optoelectronic applications. They even met commercialization success through their implementation in high-end displays with unmatched brightness and color rendering. For such applications, however, QDs must be shielded from oxygen and water vapor, which are known to degrade their optical properties over time. Even with highly qualitative QDs, this can only be achieved through their encapsulation between barrier layers. With the emergence of mini- and microLED for higher contrast and miniaturized displays, new strategies must be found for the concomitant patterning and encapsulation of QDs, with sub-millimeter resolution. To this end, we developed a new approach for the direct patterning of QDs through maskless lithography. By combining QDs in photopolymerizable resins with digital light processing (DLP) projectors, we developed a versatile and massively parallel fabrication process for the additive manufacturing of functional structures that we refer to as QD pockets. These 3D heterostructures are designed to provide isotropic encapsulation of the QDs, and hence prevent edge ingress from the lateral sides of QD films, which remains a shortcoming of the current technologies.

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“…The CIS/ZnS QDs can also be synthesized via aqueous routes, whereas their PLQYs are much lower . There are many reports regarding fluorescent QD nanocomposites using acrylic resins prepared by UV-curing technique. − On the other hand, to the best of our knowledge, celloxide, which is an alicyclic epoxy compound, has not been investigated as a matrix for fluorescent QD nanocomposites yet. The ligand molecule must have (i) a structure similar to that of celloxide and (ii) functional groups, such as thiol or carboxyl, that are easily adsorbed onto the QD surface. , Although our preliminary experiments showed that ligand exchange with cyclohexanethiol improved the dispersibility, the odor was very strong and difficult to handle .…”

Section: Introductionmentioning

confidence: 99%

Transparent Nanocomposites Comprising Ligand-Exchanged CuInS₂/ZnS Quantum Dots and UV-Cured Resin for Wavelength Converters

2022

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Quantum dots (QDs) dispersed in UV-curable resin are used for patterning in photolithography and inkjet printing. However, low affinity between the main component of UV-curable resins known as celloxide, an alicyclic diepoxy compound, and QD surface ligands with alkyl chains causes significant aggregation of QDs. In this study, the dispersibility of core/shell CuInS 2 /ZnS QDs with adsorbed 1-dodecanethiol and oleic acid in celloxide was improved using the ligand exchange method to prepare transparent fluorescent nanocomposites. Cyclohexyl 3-mercaptopropionate (MPACH) and 3-mercaptopropionic acid (MPA) were successfully adsorbed onto the QDs. MPACH-modified QDs (QD-MPACH) were well dispersed in the UV-curable resin, whereas MPA-modified QDs (QD-MPA) exhibited significant aggregation. Nanocomposite plates containing dispersed QDs were prepared by UV irradiation. The QD-MPACH nanocomposite plate was transparent, while the QD-MPA nanocomposite plate was turbid. The homogeneous dispersion of QD-MPACH was attributed to the similarity in the molecular structure between MPACH and celloxide. The photoluminescence (PL) peak of the QD-MPA nanocomposite occurred at a longer wavelength than that of the QD-MPACH nanocomposite. Furthermore, compared with the absolute photoluminescence quantum yield (PLQY) of the as-prepared QDs in toluene (55%), that of the QD-MPA nanocomposite was smaller (46%), and that of the QD-MPACH nanocomposite was higher (61%). An enhanced self-absorption effect was observed for the QD-MPA nanocomposite because of significant light scattering by the aggregates and concentration quenching, resulting in the PL redshift and decreased PLQY. Moreover, the PL intensity of the QD-MPACH nanocomposite was maintained at 98% of the initial value after continuous excitation-light irradiation for 5 h. The high PLQY and photostability of the QD-MPACH nanocomposite are beneficial in practical applications.

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Fabrication of light emitting diodes using photo-patternable quantum dot-acrylate resins

Abstract: We report the preparation of photo-patternable quantum dot (QD)-acrylate resins for application in light-emitting diodes (LEDs).

Cited by 5 publications

References 19 publications

General Strategies for Preparing Hybrid Polymer/Quantum Dot Nanocomposites for Color Conversion

General Strategies for Preparing Hybrid Polymer/Quantum Dot Nanocomposites for Color Conversion

Quantum Dot Patterning and Encapsulation by Maskless Lithography for Display Technologies

Transparent Nanocomposites Comprising Ligand-Exchanged CuInS₂/ZnS Quantum Dots and UV-Cured Resin for Wavelength Converters

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Fabrication of light emitting diodes using photo-patternable quantum dot-acrylate resins

Abstract: We report the preparation of photo-patternable quantum dot (QD)-acrylate resins for application in light-emitting diodes (LEDs).

Cited by 5 publications

References 19 publications

General Strategies for Preparing Hybrid Polymer/Quantum Dot Nanocomposites for Color Conversion

General Strategies for Preparing Hybrid Polymer/Quantum Dot Nanocomposites for Color Conversion

Quantum Dot Patterning and Encapsulation by Maskless Lithography for Display Technologies

Transparent Nanocomposites Comprising Ligand-Exchanged CuInS2/ZnS Quantum Dots and UV-Cured Resin for Wavelength Converters

Contact Info

Product

Resources

About

Transparent Nanocomposites Comprising Ligand-Exchanged CuInS₂/ZnS Quantum Dots and UV-Cured Resin for Wavelength Converters