AlGaInP Red LEDs with Hollow Hemispherical Polystyrene Arrays

Cheng, Wen Ching; Huang, Shuai; Chen, Yi Jiun; Wang, Chia Sheng; Lin, Hoang Yan; Wu, Tianwei; Horng, Ray−Hua

doi:10.1038/s41598-018-19405-y

Cited by 13 publications

(10 citation statements)

References 26 publications

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“…Typically, for AlGaInP μLEDs with passivated sidewalls, the maximum EQE still shifts to higher current densities due to increasing SRH nonradiative recombination with decreasing device size. 77,81 However, the maximum EQE for the InGaN μLEDs occurs at nearly the same current density, as shown in Figure 5e 87 The structural schematic of the p-side-up AlGaInP-based μLED with a HHPS array is shown in Figure 6a. Figure 6b displays cross-sectional and planar views of the HHPS array.…”

Section: ■ Monochromatic μLedsmentioning

confidence: 94%

“…The HHPS array topologies successfully improved the light extraction of AlGaInP LEDs. 87 The EQEs of the original AlGaInP LED and AlGaInP LED with a HHPS array at a 350 mA injection current were 20.92% and 33.77%, and the wallplug efficiencies were 17.11% and 27.33%, respectively. The increasing overall extraction efficiency was due to the embedded scatterer (air hole) in the HHPS array, which increased the chance of light scattering and enlarged the effective light cone by about 1.6-fold.…”

Section: ■ Monochromatic μLedsmentioning

confidence: 96%

“…To increase the light extraction efficiency (LEE) of red LEDs, spin-coated polystyrene (PS) nanosphere arrays atop AlGaInP-based μLED surfaces have recently been proposed. − Figure depicts p-side-up red AlGaInP-based μLEDs with hollow hemispheric PS (HHPS) arrays . The structural schematic of the p-side-up AlGaInP-based μLED with a HHPS array is shown in Figure a.…”

Section: Monochromatic μLedsmentioning

confidence: 99%

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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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Section: ■ Monochromatic μLedsmentioning

confidence: 94%

Section: ■ Monochromatic μLedsmentioning

confidence: 96%

Section: Monochromatic μLedsmentioning

confidence: 99%

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

Lee

Chen

et al. 2022

ACS Photonics

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“…The dimensions of micro-LEDs were 80 × 80 µm 2 . The AlGaInP based red FC micro-LED structure consisted of a metal layer, a GaInP etching stop layer, an n + -GaAs contact layer, n-cladding AlGaInP, an n-type AlInP diffusion barrier, GaInP/AlGaInP multiple quantum wells, a p-type AlInP diffusion barrier, p-cladding AlGaInP, and a p-GaP window layer [31,32]. The sapphire substrate was bonded onto the AlGaInP based red TFFC micro-LED to form the AlGaInP based red FC micro-LED [33].…”

Section: Simulation Modelmentioning

confidence: 99%

Light Extraction Analysis of AlGaInP Based Red and GaN Based Blue/Green Flip-Chip Micro-LEDs Using the Monte Carlo Ray Tracing Method

et al. 2019

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Micro-scale light emitting diodes (micro-LEDs) commonly employ a thin-film flip-chip (TFFC) structure whose substrate is lifted off by an excimer laser. However, flip-chip (FC) micro-LEDs with a substrate can provide a sharp rise on sidewall emission by increasing the sidewall area. Here, we investigate the influence of substrate thickness, encapsulation, surface texture, microstructures between the substrate and epilayer, as well as the size, cutting shape, and angle of the chip on the light extraction efficiencies (LEEs) of FC micro-LEDs by using the Monte Carlo ray tracing method. We find that the LEE of the blue FC micro-LED chip increases by 46.5% over that of the blue TFFC micro-LED chip. After the encapsulation with the epoxy lens is applied, the LEEs of the blue TFFC micro-LED and blue FC micro-LED increase by 129% and 110.5%, respectively. The underlying mechanisms for the use of surface texture, patterned sapphire substrate, air-void array, and chip shaping technologies to improve the LEEs of FC micro-LEDs are also investigated in detail. We find that the LEEs AlGaInP based red FC micro-LED and GaN based blue/green FC micro-LEDs exhibit a sharp rise when the chip size drops from 30 to 10 µm. The inverted trapezoid FC micro-LED with patterned sapphire substrate (PSS) and encapsulation shows extraordinarily strong top emission and high collimation. We believe that our study offers a promising and practical route for obtaining high efficiency micro-LEDs.

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“…There are lots of researchers studying the blue and green Micro-LED and a little researcher pay attention to the red Micro-LED. Ray-Hua Horng's group has done many studies on red LEDs several years [2][3][4][5][6][7]. Recently, they have published about red Micro-LED that introduced the fabrication of red Micro-LED chip, and they are focus on optoelectronic characteristics and the effect of annealing temperature on I-V curve [8][9].…”

Section: Introductionmentioning

confidence: 99%

P‐7.8: Study on Temperature Sensing of Red Micro‐LED

Wang¹,

Lu²,

Zhanghu³

et al. 2019

Symp Digest of Tech Papers

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In the recent years, Micro‐LED has caused the enthusiastic attention of the society. There are some research groups studying the blue and green Micro‐LED, while a little researcher focused on the characteristic of red light. This paper inctroduces the temperature sensing of 100 µm × 100 µm red Micro‐LED. We study the temperature sensing of red Micro‐LED by test the I‐V curve with a temperature range covers ‐150 °C to 150 °C. The study will broaden our understanding of the characteristics of red LED and make it more widely used.

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AlGaInP Red LEDs with Hollow Hemispherical Polystyrene Arrays

Cited by 13 publications

References 26 publications

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

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

Light Extraction Analysis of AlGaInP Based Red and GaN Based Blue/Green Flip-Chip Micro-LEDs Using the Monte Carlo Ray Tracing Method

P‐7.8: Study on Temperature Sensing of Red Micro‐LED

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