Highly Efficient Liquid-Quantum Dot/Melamine- Modified Urea-Formaldehyde Microcapsules for White Light-Emitting Diodes

Wang, Hong; Xing, Yong-Heng; Li, Jie-Xin; Tan, Jing; Li, Zongtao; Song, Changhui

doi:10.1109/led.2021.3056583

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…The microcapsules demonstrated an increase in the luminous efficiency of 15.9% compared to the traditional solid QDs at a specific QD energy proportion. [95] In addition to Cd-based QD materials, in situ polymerization strategies are also widely used to fabricate composites with PeQD materials. Because of their poor stability and good solution processability, PeQDs are commonly encapsulated in polymer matrices.…”

Section: In Situ Polymerizationmentioning

confidence: 99%

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A Review on Quantum Dot‐Based Color Conversion Layers for Mini/Micro‐LED Displays: Packaging, Light Management, and Pixelation

Chen

Zhao

et al. 2023

Advanced Optical Materials

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Mini/microlight‐emitting diodes (LEDs) are one of the most promising technologies for next‐generation displays to meet the requirements of demanding applications, including augmented reality/virtual reality displays, wearable devices, and microprojectors. To realize full‐color displays, the strategy of combining miniaturized blue nitride‐based LEDs with color conversion layers is promising due to the high efficiencies of the LEDs and the advantageous manufacturing. Quantum dots (QDs), owing to their high photoluminescence quantum yield, small particle size, and solution processability, have emerged as the color conversion material with the most potential for mini/micro‐LEDs. However, the integration of QDs into display technologies poses several challenges. From the material side, the stability of QD materials is still challenging. For the case of packaging QDs in a matrix, the dispersion quality of QDs and the light extraction of the emission need to be improved. From the fabrication side, the lack of high‐precision mass manufacturing strategies in QD pixelation hinders the widespread application of QDs. Toward the issues above, this review summarizes the research on QD materials for color conversion display in recent years to systematically draw an overview of the packaging strategies, the light management approaches, and the pixelation methods of QD materials toward mini/micro‐LED‐based display technologies.

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Section: In Situ Polymerizationmentioning

confidence: 99%

“…The microcapsules demonstrated an increase in the luminous efficiency of 15.9% compared to the traditional solid QDs at a specific QD energy proportion. [ 95 ]…”

Section: Solid‐state Packaging Of Qdsmentioning

confidence: 99%

A Review on Quantum Dot‐Based Color Conversion Layers for Mini/Micro‐LED Displays: Packaging, Light Management, and Pixelation

Chen

Zhao

et al. 2023

Advanced Optical Materials

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“…In comparison with RGB LEDs, light-conversion-material-based white light-emitting diodes (WLEDs) have played leading roles in solid-state illumination, due to their high lightconversion efficiencies in specific wavebands, stability under various junction temperatures, low cost, and feasibility in color tunability [1][2][3]. Conventionally, the color performance of WLEDs is evaluated from two aspects: the emitting color from the WLED and the releasing color of objects exposed under the WLED.…”

Section: Introductionmentioning

confidence: 99%

An Investigation on CCT and Ra Optimization for Trichromatic White LEDs Using a Dual-Weight-Coefficient-Based Algorithm

Xiao

et al. 2022

Micromachines

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Spectral optimization is applied as an effective tool in designing solid-state lighting devices. Optimization speed, however, has been seldomly discussed in previous reports as regards designing an algorithm for white light-emitting diodes (WLEDs). In this study, we propose a method for trichromatic WLEDs to obtain the optimal Ra under target correlated color temperatures (CCTs). Blue-, yellow-, and red-color monochromatic spectra, produced by the GaN LED chip, YAG:Ce3+ phosphors, and CdSe/ZnSe quantum dots, respectively, are adopted to synthesize white light. To improve the effectiveness of our method, the concept of dual weight coefficients is proposed, to maintain a numerical gap between the proposed floating CCT and the target CCT. This gap can effectively guarantee that Ra and CCT ultimately move toward the targeting value simultaneously. Mechanisms of interaction between CCT, Ra, and dual-weight coefficients are investigated and discussed in detail. Particularly, a fitting curve is drawn to reveal the linear relationship between weight coefficients and target CCTs. This finding effectively maintains the accuracy and accelerates the optimization process in comparison with other methods with global searching ability. As an example, we only use 29 iterations to achieve the highest Ra of 96.1 under the target CCT of 4000 K. It is hoped that this study facilitates technology development in illumination-related areas such as residential intelligent lighting and smart planting LED systems.

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Enhancing thermal and optical properties for liquid quantum-dot-based self-loop system toward laser illumination by controlling the layer location

Ding

Song

Tang

et al. 2022

Journal of Luminescence

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Highly Efficient Liquid-Quantum Dot/Melamine- Modified Urea-Formaldehyde Microcapsules for White Light-Emitting Diodes

Cited by 4 publications

References 28 publications

A Review on Quantum Dot‐Based Color Conversion Layers for Mini/Micro‐LED Displays: Packaging, Light Management, and Pixelation

A Review on Quantum Dot‐Based Color Conversion Layers for Mini/Micro‐LED Displays: Packaging, Light Management, and Pixelation

An Investigation on CCT and Ra Optimization for Trichromatic White LEDs Using a Dual-Weight-Coefficient-Based Algorithm

Enhancing thermal and optical properties for liquid quantum-dot-based self-loop system toward laser illumination by controlling the layer location

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