Colloidal Quantum Dot Enhanced Color Conversion Layer for Micro LEDs

Lin, Chung Yen; Liang, Kai-Ling; Kuo, Wei-Hung; Shen, Haotian; Wu, Chun I.; Fang, Yen-Hsiang

doi:10.1587/transele.2021dii0005

Cited by 19 publications

(14 citation statements)

References 32 publications

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“…Despite the fact that QD passivation minimizes QY degradation, these approaches limit light absorption due to the lower volume density of an active region, which is often the core of QDs [25][26][27]. Inkjet printing is a low-cost printing technique that allows for large-area manufacturing without the use of a mask, making colloidal QDs a good choice for next-generation display technology [28]. As a result, for a QD-based micro-LED display, a novel structure that can simultaneously enhance the light absorption and stability of QDs is desired.…”

Section: Introductionmentioning

confidence: 99%

High-Uniform and High-Efficient Color Conversion Nanoporous GaN-Based Micro-LED Display with Embedded Quantum Dots

et al. 2021

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Quantum dot (QD)-based RGB micro-LED technology is seen as one of the most promising approaches towards full color micro-LED displays. In this work, we present a novel nanoporous GaN (NP-GaN) structure that can scatter light and host QDs, as well as a new type of micro-LED array based on an NP-GaN embedded with QDs. Compared to typical QD films, this structure can significantly enhance the light absorption and stability of QDs. As a result, the green and red QDs exhibited light conversion efficiencies of 90.3% and 96.1% respectively, leading to improvements to the luminous uniformity of the green and red subpixels by 90.7% and 91.2% respectively. This study provides a viable pathway to develop high-uniform and high-efficient color conversion micro-LED displays.

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Section: Introductionmentioning

confidence: 99%

High-Uniform and High-Efficient Color Conversion Nanoporous GaN-Based Micro-LED Display with Embedded Quantum Dots

et al. 2021

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“…However, it also leads to a more severe reabsorption loss in QDs. Therefore, an optical model is established to optimize the QD material concentration and QDCC layer thickness to achieve a proper balance between the absorption of excitation photons and light conversion efficiency. , As shown in Figure c, the optimized dose factor (the product of QDCC layer thickness and QD concentration) should exhibit an OD > 1.7 and a light conversion efficiency >80% of its maximum value. As the dose factor increases, the absorption of blue light increases following the Beer’s law, but the light conversion efficiency first increases and then decreases.…”

Section: Emerging Quantum Dot Color-conversion Technology Beyond Quan...mentioning

confidence: 99%

Luminescent Nanomaterials for Energy-Efficient Display and Healthcare

et al. 2022

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Luminescent quantum dots (QDs) and perovskite nanocrystals (PNCs) are promising, efficient energy converters for advanced displays and light sources. Their widespread applications in the photoluminescence (PL)-based displays have been achieved through color enhancement films and patterned color-converters. Meanwhile, electroluminescence (EL) devices based on QDs and PNCs are still under active development, but emerging applications in the healthcare domains could accelerate their adoption. Herein, we first analyze the QD color-conversion displays guided by state-of-the-art research and then summarize the evolution of in situ strategies to fabricate efficient and stable PNC–polymer composites. Subsequently, we introduce the application of flexible QD light-emitting devices for healthcare as a potential early target market. Remaining challenges and future perspectives of QDs and PNCs as light-converters for PL displays, and of QDs for EL applications in healthcare, are analyzed.

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“…Chu et al fabricated a monolithic RGB μLED display and improved the color purity by introducing a blue light absorption material in the DBR structure . Lin et al developed a color-conversion layer with colloidal QDs for μLEDs . Song et al fabricated monolithic RGB μLEDs with QDs embedded in nanoporous GaN .…”

Section: Overview Of μLedsmentioning

confidence: 99%

“…65 Lin et al developed a color-conversion layer with colloidal QDs for μLEDs. 66 Song et al fabricated monolithic RGB μLEDs with QDs embedded in nanoporous GaN. 67 Lau et al utilized a red QD photoresist as a color converter for fullcolor PM μLED displays.…”

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confidence: 99%

Technology and Applications of Micro-LEDs: Their Characteristics, Fabrication, Advancement, and Challenges

Lee

Chen

et al. 2022

ACS Photonics

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Micro-light-emitting diodes (μLEDs) are getting much attention in display industry because of their outstanding optical and electrical characteristics. μLEDs have several advantages over liquid crystal displays (LCDs) and organic lightemitting diodes (OLEDs). μLEDs are showing long lifetimes, high reliability, high power efficiencies, high brightness, and fast response times with tiny pixels. However, for commercial usage, the high production cost and low external quantum efficiency (EQE) are the major hurdles. In this review, we briefly discuss the breakthroughs in μLED technology, fabrication methods, optical/ electrical characteristics, and challenges for display applications. In addition, the development of monolithic μLEDs and general device characteristics combined with various quantum dot patterning processes are systematically discussed. Potential solutions to address these challenges are also presented case by case.

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Colloidal Quantum Dot Enhanced Color Conversion Layer for Micro LEDs

Cited by 19 publications

References 32 publications

High-Uniform and High-Efficient Color Conversion Nanoporous GaN-Based Micro-LED Display with Embedded Quantum Dots

High-Uniform and High-Efficient Color Conversion Nanoporous GaN-Based Micro-LED Display with Embedded Quantum Dots

Luminescent Nanomaterials for Energy-Efficient Display and Healthcare

Technology and Applications of Micro-LEDs: Their Characteristics, Fabrication, Advancement, and Challenges

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