Joon Seop Kwak
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View article: Temperature-Dependent Degradation of Volatile Organic Compounds Using Ga2O3 Photocatalyst
Temperature-Dependent Degradation of Volatile Organic Compounds Using Ga2O3 Photocatalyst Open
Volatile organic compounds (VOCs), including benzene, toluene, and formaldehyde, are hazardous air pollutants that require efficient and sustainable mitigation strategies. Photocatalytic degradation of VOCs offers a promising pathway; howe…
View article: LighthouseGS: Indoor Structure-aware 3D Gaussian Splatting for Panorama-Style Mobile Captures
LighthouseGS: Indoor Structure-aware 3D Gaussian Splatting for Panorama-Style Mobile Captures Open
Recent advances in 3D Gaussian Splatting (3DGS) have enabled real-time novel view synthesis (NVS) with impressive quality in indoor scenes. However, achieving high-fidelity rendering requires meticulously captured images covering the entir…
View article: Characterization of hotspot formation in AlGaN/GaN HEMTs by probing Raman scattering through an optically transparent gate
Characterization of hotspot formation in AlGaN/GaN HEMTs by probing Raman scattering through an optically transparent gate Open
AlGaN/GaN high electron mobility transistors (HEMTs) are in high demand for wireless communication and power conversion applications due to their high-power and high-frequency capabilities. However, the extremely high operational heat flux…
View article: Monolithic Integration of GaN Thin Film and GaN Nanorods Pixels: Facile Growth of InGaN/GaN Quantum Wells for the Realization of Full Color Micro‐LED Display
Monolithic Integration of GaN Thin Film and GaN Nanorods Pixels: Facile Growth of InGaN/GaN Quantum Wells for the Realization of Full Color Micro‐LED Display Open
In this work, an innovative method is introduced for fabricating large‐area micro‐LEDs (µLEDs) specifically for green and blue emission through a combination of GaN thin film and GaN nanorods (NRs) on the orientation‐controlled template de…
View article: On z-Superstable and Critical Configurations of Chip Firing Pairs
On z-Superstable and Critical Configurations of Chip Firing Pairs Open
It is well known that there is a duality map between the superstable configurations and the critical configurations of a graph. This was extended to all M-matrices in (Guzmàn-Klivans 2015). We show a natural way to extend this to all $(L,M…
View article: Highly Concentrated Asymmetric KTFSI for Aqueous Potassium Ion Batteries(Adv. Energy Mater. 38/2024)
Highly Concentrated Asymmetric KTFSI for Aqueous Potassium Ion Batteries(Adv. Energy Mater. 38/2024) Open
View article: Demonstration of Efficient Ultrathin Side-Emitting InGaN/GaN Flip-Chip Light-Emitting Diodes by Double Side Reflectors
Demonstration of Efficient Ultrathin Side-Emitting InGaN/GaN Flip-Chip Light-Emitting Diodes by Double Side Reflectors Open
This work proposes an InGaN/GaN multiple-quantum-well flip-chip blue ultrathin side-emitting (USE) light-emitting diode (LED) and describes the sidewall light emission characteristics for the application of backlight units in display techn…
View article: 32 × 32 Pixelated High-Power Flip-Chip Blue Micro-LED-on-HFET Arrays for Submarine Optical Communication
32 × 32 Pixelated High-Power Flip-Chip Blue Micro-LED-on-HFET Arrays for Submarine Optical Communication Open
This work proposes the use of integrated high-power InGaN/GaN multiple-quantum-well flip-chip blue micro light-emitting diode (μ-LED) arrays on an AlGaN/GaN-based heterojunction field-effect transistor (HFET), also known as a high electron…
View article: The Variation of Sapphire Substrate Shape of Micro LED Array to Increasing of Light Intensity and Contrast Ratio
The Variation of Sapphire Substrate Shape of Micro LED Array to Increasing of Light Intensity and Contrast Ratio Open
View article: Erratum to : 청색 마이크로 LED의 광 추출 효율에 미치는 칩 크기 의존성 연구
Erratum to : 청색 마이크로 LED의 광 추출 효율에 미치는 칩 크기 의존성 연구 Open
View article: Graphite as a Long‐Life Ca<sup>2+</sup>‐Intercalation Anode and its Implementation for Rocking‐Chair Type Calcium‐Ion Batteries
Graphite as a Long‐Life Ca<sup>2+</sup>‐Intercalation Anode and its Implementation for Rocking‐Chair Type Calcium‐Ion Batteries Open
Herein, graphite is proposed as a reliable Ca 2+ ‐intercalation anode in tetraglyme (G 4 ). When charged (reduced), graphite accommodates solvated Ca 2+ ‐ions (Ca‐G 4 ) and delivers a reversible capacity of 62 mAh g −1 that signifies the f…
View article: Improvement in the heat dissipation of matrix LED headlamps for vehicles according to the thickness and thermal conductivity of thermal interface materials
Improvement in the heat dissipation of matrix LED headlamps for vehicles according to the thickness and thermal conductivity of thermal interface materials Open
This study examined the effects of thermal interface materials (TIMs) in light-emitting diode (LED) headlamps for vehicles based on thermally conductive plastics. Heat transfer is a very important issue in LED applications because the stab…
View article: Chip Size-Dependent Light Extraction Efficiency for Blue Micro-LEDs
Chip Size-Dependent Light Extraction Efficiency for Blue Micro-LEDs Open
View article: Improved Light Output Power of 16 × 16 Pixelated Micro‐LEDs for Headlights by Enhancing the Reflectivity and Coverage of the <i>p</i>‐Electrode (Phys. Status Solidi A 10∕2018)
Improved Light Output Power of 16 × 16 Pixelated Micro‐LEDs for Headlights by Enhancing the Reflectivity and Coverage of the <i>p</i>‐Electrode (Phys. Status Solidi A 10∕2018) Open
Light Emitting Diodes A pixel array of GaN-based micro-light emitting diodes (μ-LEDs) based on a flip-chip structure and driven by a passive matrix is fabricated. The light output power of 16 × 16 pixelated μ-LEDs for headlights of vehicle…
View article: Flexible deep-ultraviolet light-emitting diodes for significant improvement of quantum efficiencies by external bending
Flexible deep-ultraviolet light-emitting diodes for significant improvement of quantum efficiencies by external bending Open
Deep ultraviolet (DUV) light at the wavelength range of 250‒280 nm (UVC spectrum) is essential for numerous applications such as sterilization, purification, sensing, and communication. III-nitride-based DUV light-emitting diodes (DUV LEDs…
View article: Impact of Plasma Electron Flux on Plasma Damage‐Free Sputtering of Ultrathin Tin‐Doped Indium Oxide Contact Layer on <i>p</i>‐GaN for InGaN/GaN Light‐Emitting Diodes
Impact of Plasma Electron Flux on Plasma Damage‐Free Sputtering of Ultrathin Tin‐Doped Indium Oxide Contact Layer on <i>p</i>‐GaN for InGaN/GaN Light‐Emitting Diodes Open
The origin of plasma‐induced damage on a p ‐type wide‐bandgap layer during the sputtering of tin‐doped indium oxide (ITO) contact layers by using radiofrequency‐superimposed direct current (DC) sputtering and its effects on the forward vol…
View article: Design of LED Bicycle Headlamp with a Horizontally Wide Viewing Angle
Design of LED Bicycle Headlamp with a Horizontally Wide Viewing Angle Open
This paper proposes a LED bicycle headlamp with a wide viewing angle to help bicyclists see the front effectively and because of its high visibility to reduce the risks of accidents around intersections or blind spots. The wide viewing ang…
View article: Improvement of the Light Emission Efficiency on Nonpolar a-plane GaN LEDs with SiO<sub>2</sub> Current Blocking Layer
Improvement of the Light Emission Efficiency on Nonpolar a-plane GaN LEDs with SiO<sub>2</sub> Current Blocking Layer Open
In this study, we investigate the $SiO_2$ current blocking layer (CBL) to improve light output power efficiency in nonpolar a-plane (11-20) GaN LEDs on a r-plane sapphire substrate. The $SiO_2$ CBL was produced under the p-pad layer using …
View article: Stretchable, alternating-current-driven white electroluminescent device based on bilayer-structured quantum-dot-embedded polydimethylsiloxane elastomer
Stretchable, alternating-current-driven white electroluminescent device based on bilayer-structured quantum-dot-embedded polydimethylsiloxane elastomer Open
This study examines the use of a spontaneously formed bilayer-structured emitting layer for white light from stretchable ACEL devices.
View article: Vertical-Injection AlGaInP LEDs with n-AlGaInP Nanopillars Fabricated by Self-Assembled ITO-Based Nanodots
Vertical-Injection AlGaInP LEDs with n-AlGaInP Nanopillars Fabricated by Self-Assembled ITO-Based Nanodots Open
View article: Electron beam irradiated silver nanowires for a highly transparent heater
Electron beam irradiated silver nanowires for a highly transparent heater Open
View article: A Study on Improvement of the Light Emitting Efficiency on Flip Chip LED with Patterned Sapphire Substrate by the Optical Simulation
A Study on Improvement of the Light Emitting Efficiency on Flip Chip LED with Patterned Sapphire Substrate by the Optical Simulation Open
Recently many studies being carried out to increase the light efficiency of LED. The external quantum efficiency of LED, generally the light efficiency, is determined by the internal quantum efficiency and the light extraction efficiency. …
View article: Vertical-Injection AlGaInP LEDs with n-AlGaInP Nanopillars Fabricated by Self-Assembled ITO-Based Nanodots
Vertical-Injection AlGaInP LEDs with n-AlGaInP Nanopillars Fabricated by Self-Assembled ITO-Based Nanodots Open
The light output power of AlGaInP-based vertical-injection light-emitting diodes (VI-LEDs) can be enhanced significantly using n-AlGaInP nanopillars. n-AlGaInP nanopillars, ~200 nm in diameter, were produced using SiO2 nanopillars as an et…
View article: Design and Fabrication of Heat Sink for Vehicle LED Headlamp Using Thermally-Conductive Plastics
Design and Fabrication of Heat Sink for Vehicle LED Headlamp Using Thermally-Conductive Plastics Open
Since LEDs (light emitting diodes) have many advantages as a light source in vehicle headlamp, such as good reliability, energy and space saving, and flexible headlamp design. On the other hand, the dependence of its performance and life o…
View article: Light-extraction efficiency control in AlGaN-based deep-ultraviolet flip-chip light-emitting diodes: a comparison to InGaN-based visible flip-chip light-emitting diodes
Light-extraction efficiency control in AlGaN-based deep-ultraviolet flip-chip light-emitting diodes: a comparison to InGaN-based visible flip-chip light-emitting diodes Open
We study light-extraction efficiency (LEE) of AlGaN-based deep-ultraviolet light-emitting diodes (DUV-LEDs) using flip-chip (FC) devices with varied thickness in remaining sapphire substrate by experimental output power measurement and com…
View article: Light interaction in sapphire/MgF2/Al triple-layer omnidirectional reflectors in AlGaN-based near ultraviolet light-emitting diodes
Light interaction in sapphire/MgF2/Al triple-layer omnidirectional reflectors in AlGaN-based near ultraviolet light-emitting diodes Open
This study examined systematically the mechanism of light interaction in the sapphire/MgF 2 /Al triple-layer omnidirectional reflectors (ODR) and its effects on the light output power in near ultraviolet light emitting diodes (NUV-LEDs) wi…
View article: Effects of Electron-Beam Pretreatment on Anodically Grown TiO2 Nanotubes
Effects of Electron-Beam Pretreatment on Anodically Grown TiO2 Nanotubes Open
A Ti substrate was pretreated with an electron beam (E-beam) at RF 150 W and DC 1500 V for 1 h under Ar atmosphere and then anodized in a 1 M H3PO4/1 M NaOH/0.5 wt% HF solution at 20 V. The E-beam pretreatment led to a change in the compos…