Integrated parabolic nanolenses on MicroLED color pixels

Demory, Brandon; Chung, Kunook; Katcher, Adam; Sui, Jingyang; Deng, Hui; Ku, Pei-Cheng

doi:10.1088/1361-6528/aaac5f

Cited by 10 publications

(9 citation statements)

References 25 publications

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Section: Key Technologies For High‐performance Thin‐film µLedsmentioning

confidence: 99%

“…To enhance the light extraction efficiency, various methods such as patterned sapphire substrate, lens integration, surface texturing, and Bragg reflector implementation on µLEDs have been investigated. Figure c presents GaN µLEDs with parabolic nanolenses for light condensing . The lens‐integrated µLED had increased light intensity and 30%‐decreased divergent angle by minimizing the irregular light diffusion.…”

Section: Key Technologies For High‐performance Thin‐film µLedsmentioning

confidence: 99%

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Micro Light‐Emitting Diodes for Display and Flexible Biomedical Applications

Lee

Shin

Park

et al. 2019

Adv Funct Materials

149

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Inorganic-based micro light-emitting diodes (µLEDs) have witnessed significant improvements in terms of display and biomedical applications, which can shift the paradigm of future optoelectronic systems. In particular, µLED displays are on the verge of becoming the next big interface platform for visual communications, expanding to various internet of things and wearable/bioapplications. Novel µLED concepts need to be upgraded to be able to satisfy their potential optoelectric applications, such as virtual reality, smart watches, and medical sensors for individual computing in this hyperconnected society. Here, representative progresses in the field of flexible µLEDs are reviewed with regard to device structures, massive µLED transfers, methods for performance enhancement, and applications.

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Section: Key Technologies For High‐performance Thin‐film µLedsmentioning

confidence: 99%

Section: Key Technologies For High‐performance Thin‐film µLedsmentioning

confidence: 99%

Micro Light‐Emitting Diodes for Display and Flexible Biomedical Applications

Lee

Shin

Park

et al. 2019

Adv Funct Materials

149

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“…A monochromic blue GaN-based micro-LED chip is used as the excitation source, which can be purchased through Xiamen Changelight Co., Ltd. The structure of the blue GaN-based micro-LED chip is shown in Figure 5b [5]. The wavelength of the blue micro-LED chip is 450 nm, and the size is set as 30 µm × 30 µm × 100 µm.…”

Section: Optical Simulation For Gan Based Micro-led With Qds Filmmentioning

confidence: 99%

“…As a novel technology applied in the display field, micro-light emitting diodes (micro-LEDs) have attracted lots of attention in recent years. Compared with traditional LEDs, the micro-LED is reduced to micrometer-scale size (< 50 µm) [4][5][6]. For realizing the full color display of micro-LEDs, different technologies have been presented, such as combining the three colorized red, green and blue (RGB) micro-LED chip and color conversion material methods [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Factors Affecting Optical Performance of GaN-Based Micro-LEDs with Quantum Dots Films

et al. 2020

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Optical performance in terms of light efficiency, color crosstalk and ambient contrast ratio were analyzed for blue GaN-based micro-light emitting diodes (micro-LEDs) combined with red/green quantum dots (QDs)-polymethyl methacrylate (PMMA) films. The thickness and mass ratio of QDs films are two critical factors in affecting the performance of micro-LEDs. Firstly, the precise optical modeling of QDs-PMMA films is established based on the double integrating sphere (DIS) testing system and inverse adding doubling algorithm (IADA) theory. Red and green QDs-PMMA films are composed of ZnCdSe/ZnS QDs and green ZnCdSeS/ZnS QDs, respectively. The fundamental optical parameters of QDs-PMMA films, including scattering, absorption and anisotropy coefficients, are obtained successfully. Secondly, based on these optical parameters, the Monte Carlo ray tracing method is applied to analyze the effect of a QDs-PMMA film’s thickness and mass ratio on the optical performance of micro-LEDs. Results reveal that the light efficiency first increases and then decreases with the increase of a QDs film’s thickness or mass ratio, owing to the scattering characteristics of QDs. Different from the variation tendencies of light efficiency, the crosstalk between adjacent pixels increases as the QDs-PMMA film’s thickness or mass ratio increases, and the ambient contrast ratio is kept stable when the thickness increases. The mass ratio variation of QDs film can change the optical performance of micro-LEDs more effectively than thickness, which demonstrates that mass ratio is a more important factor affecting the optical performance of micro-LEDs.

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“…Most of the LED modelling works have been proposed with different techniques, such as flip‐chip LEDs, metallic grating coated LEDs, and surface roughening by chemical etching [55]. Moreover, placing a photonic crystal on the top layer [56], micro or nanostructure improvement, sub‐wavelength structure changing on the top layer of GaN [57], reducing Fresnel reflection, patterning sapphire substrates [58], and reducing far‐field divergence by implementing nano‐lens [59] are also considered. Fig.…”

Section: Techniques For High‐speed Vlc Networkmentioning

confidence: 99%

Review of advanced techniques for multi‐gigabit visible light communication

Rahman

Bakibillah

Parthiban

et al. 2020

IET Optoelectronics

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Visible light communication (VLC) is a promising candidate for future indoor wireless communication. Light emitting diodes (LEDs) are popular choices as transmitters for VLC, since they are energy efficient and have the ability to provide illumination and data transmission simultaneously. VLC is attractive for reasons such as security, the ability to use a licence free spectrum, and broad bandwidth. Previous review articles on VLC mainly focused on VLC network algorithms, implementation challenges, system design, applications, and physical layer technologies. Unlike the existing reviews, this study presents stateof-the-art VLC systems for high-speed data communication in the gigabit range and the techniques to achieve such high data rates. In addition, concepts such as LED modelling and fabrication process, recent commercial advancements of VLC products, and hybrid/heterogeneous networks to achieve high data rate are highlighted in this study. For this purpose, some key technologies of VLC systems, including channel equalisation from both transmitter and receiver sides, higher-order modulation techniques, wavelength division multiplexing, multiple input multiple output technology, LED modelling, and advanced fabrication processes are discussed. This study also covers recent advancements in commercialisation of VLC technology, and recent progress made by various research groups. RGB LED 15-35 MHz illumination + communication high multichip 25-30 MHz colour channel average RCLED ∼100 MHz communication high micro 350∼900 MHz sensing + communication high GaN nano-wire based ∼1 GHz high-speed communication high

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Integrated parabolic nanolenses on MicroLED color pixels

Cited by 10 publications

References 25 publications

Micro Light‐Emitting Diodes for Display and Flexible Biomedical Applications

Micro Light‐Emitting Diodes for Display and Flexible Biomedical Applications

Analysis of Factors Affecting Optical Performance of GaN-Based Micro-LEDs with Quantum Dots Films

Review of advanced techniques for multi‐gigabit visible light communication

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