Enhanced Light Extraction From Green Quantum Dot Light-Emitting Diodes by Attaching Microstructure Arrayed Films

Oh, Ji Hye; Choi, Dan Bi; Lee, Ki-Heon; Yang, Heesun; Rag, Young

doi:10.1109/jstqe.2015.2457613

Cited by 10 publications

(2 citation statements)

References 23 publications

(25 reference statements)

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“…Other strategies to enhance the light output efficiency have been proposed as well. Oh et al introduced microlens and microprism to the front side of QD-LEDs to enhance the extraction efficiency [134]. The microlens-attached QD-LEDs have a high luminescence values, which was 1.57 times higher than those of conventional QD-LEDs.…”

Section: 32mentioning

confidence: 99%

Quantum Dots-Converted Light-Emitting Diodes Packaging for Lighting and Display: Status and Perspectives

Xie

Qiu

Luo

2016

Journal of Electronic Packaging

152

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Recent years, semiconductor quantum dots (QDs) have attracted tremendous attentions for their unique characteristics for solid-state lighting (SSL) and thin-film display applications. The pure and tunable spectra of QDs make it possible to simultaneously achieve excellent color-rendering properties and high luminous efficiency (LE) when combining colloidal QDs with light-emitting diodes (LEDs). Due to its solution-based synthetic route, QDs are impractical for fabrication of LED. QDs have to be incorporated into polymer matrix, and the mixture is dispensed into the LED mold or placed onto the LED to fabricate the QD–LEDs, which is known as the packaging process. In this process, the compatibility of QDs' surface ligands with the polymer matrix should be ensured, otherwise the poor compatibility can lead to agglomeration or surface damage of QDs. Besides, combination of QDs–polymer with LED chip is a key step that converts part of blue light into other wavelengths (WLs) of light, so as to generate white light in the end. Since QD-LEDs consist of three or more kinds of QDs, the spectra distribution should be optimized to achieve a high color-rendering ability. This requires both theoretical spectra optimization and experimental validation. In addition, to prolong the reliability and lifetime of QD-LEDs, QDs have to be protected from oxygen and moisture penetration. And the heat generation inside the package should be well controlled because high temperature results in QDs' thermal quenching, consequently deteriorates QD-LEDs' performance greatly. Overall, QD-LEDs' packaging and applications present the above-mentioned technical challenges. A profound and comprehensive understanding of these problems enables the advancements of QD-LEDs' packaging processes and designs. In this review, we summarized the recent progress in the packaging of QD-LEDs. The wide applications of QD-LEDs in lighting and display were overviewed, followed by the challenges and the corresponding progresses for the QD-LEDs' packaging. This is a domain in which significant progress has been achieved in the last decade, and reporting on these advances will facilitate state-of-the-art QD-LEDs' packaging and application technologies.

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Section: 32mentioning

confidence: 99%

Quantum Dots-Converted Light-Emitting Diodes Packaging for Lighting and Display: Status and Perspectives

Xie

Qiu

Luo

2016

Journal of Electronic Packaging

152

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“…It is well known that some optical films have been widely used to promote the performance in LCDs and LEDs owing to their reflective and refractive properties [26]. Low-haze films have been widely reported and applied [27,28], and highhaze films are also worth researching.…”

Section: Introductionmentioning

confidence: 99%

Enhanced light extraction from green organic light-emitting diodes by attaching a high-haze random-bowls textured optical film

Zhai¹,

Zhu²,

Huang³

et al. 2020

J. Phys. D: Appl. Phys.

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Random-bowls textured (RBT) optical film with high optical haze (∼96%) possessing strong scattering ability is attached directly to the glass substrate exterior of organic light-emitting diodes (OLEDs) in order to improve the light-extraction efficiency of the OLEDs. The power and current efficiency of OLEDs with RBT film are improved by 27.2% and 26.3%, respectively, compared with the reference OLED without RBT film. Additionally, the EL spectrum of the OLEDs remains stable with the usage of the RBT optical film and change of visual angle. We confirm that the optical film can change the light traveling path due to its random-bowls structure and improve the extraction of a part of the light confined into the substrate by ray-tracing optical simulation. The utilization of RBT optical film with high haze is a simple and promising approach to enhancing light-extraction efficiencies of OLEDs.

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

Saeed

Zhang

et al. 2021

Adv Funct Materials

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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.

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Enhanced Light Extraction From Green Quantum Dot Light-Emitting Diodes by Attaching Microstructure Arrayed Films

Cited by 10 publications

References 23 publications

Quantum Dots-Converted Light-Emitting Diodes Packaging for Lighting and Display: Status and Perspectives

Quantum Dots-Converted Light-Emitting Diodes Packaging for Lighting and Display: Status and Perspectives

Enhanced light extraction from green organic light-emitting diodes by attaching a high-haze random-bowls textured optical film

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

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