Investigation of Modulation Bandwidth of InGaN Green Micro-LEDs by Varying Quantum Barrier Thickness

Yuan, Zexing; Li, Yanzhe; Lu, Xinyi; Wang, Zhou; Qiu, Pengjiang; Cui, Xugao; Tian, Pengfei; Wang, Qi; Zhang, Guoyi

doi:10.1109/ted.2022.3155590

Cited by 16 publications

(5 citation statements)

References 55 publications

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“…It has also been found that a thinner QB can improve the total carrier recombination rate of InGaN lLEDs. 130 In addition, Back et al 131 systemically investigated the effect of the thickness of the EBL of p-AlGaN on InGaN-based blue lLEDs with sizes ranging from 10 Â 10 to 80 Â 80 lm 2 . When the performance of a device fabricated between 2 Â 10 18 cm À3 Mg-doped 17 nm-thick Al 0.2 In 0.02 Ga 0.78 N and 2 Â 10 19 cm À3 Mg-doped 45 nm-thick Al 0.12 In 0.02 Ga 0.86 N (referred to as a balanced EBL) was assessed [Fig.…”

Section: Novel Epitaxial Structures For Iii-nitride Lledsmentioning

confidence: 99%

Recent advances in micro-pixel light emitting diode technology

Park,

Pristovsek,

Amano

et al. 2024

Applied Physics Reviews

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Display technology has developed rapidly in recent years, with III–V system-based micro-light-emitting diodes (μLEDs) attracting attention as a means to overcome the physical limitations of current display systems related to their lifetime, brightness, contrast ratio, response time, and pixel size. However, for μLED displays to be successfully commercialized, their technical shortcomings need to be addressed. This review comprehensively discusses important issues associated with μLEDs, including the use of the ABC model for interpreting their behavior, size-dependent degradation mechanisms, methods for improving their efficiency, novel epitaxial structures, the development of red μLEDs, advanced transfer techniques for production, and the detection and repair of defects. Finally, industrial efforts to commercialize μLED displays are summarized. This review thus provides important insights into the potential realization of next-generation display systems based on μLEDs.

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Section: Novel Epitaxial Structures For Iii-nitride Lledsmentioning

confidence: 99%

Recent advances in micro-pixel light emitting diode technology

Park,

Pristovsek,

Amano

et al. 2024

Applied Physics Reviews

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“…The QCSE has been reported to be mitigated by the optimization of epitaxial structures. For example, thin quantum barriers (QBs) in MQWs are crucial for reducing carrier lifetimes [ 90 , 91 , 92 ], which can decrease the polarization field inside the QW, enhance hole injection, and result in greater uniformity in carrier distribution across the active region. The schematic architectures of the LED I, LED II, and LED III samples are shown in Figure 9 a, and their corresponding GaN QB thicknesses are 12, 9, and 6 nm.…”

Section: Solution For Increasing Eqe Of µLedsmentioning

confidence: 99%

“…The QCSE has been reported to be mitigated by the optimization of epitaxial structures. For example, thin quantum barriers (QBs) in MQWs are crucial for reducing carrier lifetimes [90][91][92], which can decrease the polarization field inside the QW, enhance hole injection, and result in greater uniformity Ref. [88], with the permission of The Japan Society of Applied Physics.…”

Section: Mitigate the Qcse Effectmentioning

confidence: 99%

Recent Advances on GaN-Based Micro-LEDs

Zhang

Kang

et al. 2023

Micromachines

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GaN-based micro-size light-emitting diodes (µLEDs) have a variety of attractive and distinctive advantages for display, visible-light communication (VLC), and other novel applications. The smaller size of LEDs affords them the benefits of enhanced current expansion, fewer self-heating effects, and higher current density bearing capacity. Low external quantum efficiency (EQE) resulting from non-radiative recombination and quantum confined stark effect (QCSE) is a serious barrier for application of µLEDs. In this work, the reasons for the poor EQE of µLEDs are reviewed, as are the optimization techniques for improving the EQE of µLEDs.

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“…As mentioned in the previous section, for micro-LEDs, the small luminous area limits their potential for long-distance communication due to limited light output power. Numerous approaches have been used to enhance output power by improving epitaxy quality and altering device structure; however, there is still a trade-off between output power and modulation bandwidth, and it is challenging to improve both characteristics simultaneously [ 62 ]. Designing series or parallel connections between micro-LED structures might alleviate this trade-off by significantly increasing the output power without compromising optical bandwidth.…”

Section: Progress For Micro-led Vlc In Yellow–green To Red Emission W...mentioning

confidence: 99%

Recent Advances in Micro-LEDs Having Yellow–Green to Red Emission Wavelengths for Visible Light Communications

et al. 2023

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Visible light communication (VLC), which will primarily support high-speed internet connectivity in the contemporary world, has progressively come to be recognized as a significant alternative and reinforcement in the wireless communication area. VLC has become more popular recently because of its many advantages over conventional radio frequencies, including a higher transmission rate, high bandwidth, low power consumption, fewer health risks, and reduced interference. Due to its high-bandwidth characteristics and potential to be used for both illumination and communications, micro-light-emitting diodes (micro-LEDs) have drawn a lot of attention for their use in VLC applications. In this review, a detailed overview of micro-LEDs that have long emission wavelengths for VLC is presented, along with their related challenges and future prospects. The VLC performance of micro-LEDs is influenced by a number of factors, including the quantum-confined Stark effect (QCSE), size-dependent effect, and droop effect, which are discussed in the following sections. When these elements are combined, it has a major impact on the performance of micro-LEDs in terms of their modulation bandwidth, wavelength shift, full-width at half maximum (FWHM), light output power, and efficiency. The possible challenges faced in the use of micro-LEDs were analyzed through a simulation conducted using Crosslight Apsys software and the results were compared with the previous reported results. We also provide a brief overview of the phenomena, underlying theories, and potential possible solutions to these issues. Furthermore, we provide a brief discussion regarding micro-LEDs that have emission wavelengths ranging from yellow–green to red colors. We highlight the notable bandwidth enhancement for this paradigm and anticipate some exciting new research directions. Overall, this review paper provides a brief overview of the performance of VLC-based systems based on micro-LEDs and some of their possible applications.

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Investigation of Modulation Bandwidth of InGaN Green Micro-LEDs by Varying Quantum Barrier Thickness

Cited by 16 publications

References 55 publications

Recent advances in micro-pixel light emitting diode technology

Recent advances in micro-pixel light emitting diode technology

Recent Advances on GaN-Based Micro-LEDs

Recent Advances in Micro-LEDs Having Yellow–Green to Red Emission Wavelengths for Visible Light Communications

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