Article
Physics, Applied
Chenglong Xu, Kunzi Liu, Zhehan Yu, Zihui Zhao, Cong Chen, Jianghong Gao, Zhenhai Yang, Jichun Ye, Wei Guo
Summary: This study systematically analyzed the influences of 193 nm laser annealing on the properties of p-type GaN. It was found that laser annealing can increase the hole concentration and quantum efficiency of p-GaN, which is crucial for the development of high-efficiency LEDs.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Kazimieras Badokas, Arunas Kadys, Dominykas Augulis, Juras Mickevicius, Ilja Ignatjev, Martynas Skapas, Benjaminas Sebeka, Giedrius Juska, Tadas Malinauskas
Summary: The remote epitaxy of GaN epilayers on GaN/sapphire templates using different types of graphene interlayers was studied. The quality and structure of the graphene interlayers and GaN epilayers were analyzed using various techniques. The successful exfoliation of GaN membrane was demonstrated.
Article
Chemistry, Analytical
Min-joo Ahn, Kyu-yeon Shim, Woo-seop Jeong, Seongho Kang, Hwayoung Kim, Seunghee Cho, Dongjin Byun
Summary: We created an air tunnel structure between a GaN layer and a TPSS by carbonizing a photoresist layer in situ, allowing for rapid chemical lift-off (CLO). A trapezoid-shaped PSS was used for advantageous epitaxial growth on the upper c-plane. The air tunnel maintained its structure under the GaN layer, while the photoresist layer between the GaN layer and TPSS disappeared.
Article
Optics
Saiyu Luo, Han Gu, Xiang Geng, Xiao Tang, Chuanxiang Sheng, Li Li, Zhiping Cai
Summary: In this study, femtosecond pulse generation from diode-pumped praseodymium lasers was achieved using a novel dispersion arrangement scheme and Pr:LiYF4 crystal. The shortest pulse duration achieved was 451 fs at a pulse energy of 3 nJ and peak power of 7.2 kW.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Nursidik Yulianto, Grandprix T. M. Kadja, Steffen Bornemann, Soniya Gahlawat, Nurhalis Majid, Kuwat Triyana, Fatwa F. Abdi, Hutomo Suryo Wasisto, Andreas Waag
Summary: The study focuses on investigating the impact of laser scanning speed and integrated fluence on the LLO processing of GaN LED chips and their resulting structural properties. By adjusting the laser scanning speed, smooth GaN surfaces and good crystal quality could be obtained, despite the existing delamination of metal contact slightly degrading the LED performance. Mitigation strategies were developed to improve the optoelectrical characteristics of the lifted-off LEDs.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Physics, Applied
Panpan Li, Haojun Zhang, Hongjian Li, Trevor Cohen, Ryan Anderson, Matthew S. Wong, Emily Trageser, Yi Chao Chow, Mattanjah de Vries, Shuji Nakamura, Steven P. DenBaars
Summary: We demonstrate room-temperature stimulated emission at 568 nm from low dislocation density InGaN/GaN multi-quantum wells. For a 1.4 mm long and a 50 mu m wide ridge bar optically pumped by a high-power pulsed laser, we observed an emission peak at 568 nm with a narrow spectral width of less than 2 nm at room temperature. The measured pumping threshold is less than 1.5 MW/cm(2), and the polarization ratio of the emission is over 90%. This demonstration paves the way for the future development of electrically injected InGaN semiconductor yellow laser diodes.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Ziqian Qi, Linning Wang, Yingze Liang, Pengzhan Liu, Hongbo Zhu, Yongjin Wang
Summary: This article introduces a solar-blind full-duplex light communication system using 275-nm DUV LEDs, which eliminates electromagnetic interference and solar noise. The system allows a maximum communication distance of 7 meters and supports real-time video and file sharing.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Tianhao Jiang, Jian Wang, Jiaqi Liu, Meixin Feng, Shumeng Yan, Wen Chen, Qian Sun, Hui Yang
Summary: Semiconductor nano-membranes offer a new approach to improve the performance of optical devices. In this study, we present a fabrication method for GaN-based LED membranes, which includes the complete device structure including contact metals from Si substrate. The method involves electrochemical etching of the highly conductive AlN/Si interface, which is naturally formed in GaN-on-Si materials. Photoluminescence and Raman scattering spectra show reduced internal stress, and electrical measurements demonstrate decreased leakage current and series resistance, indicating the successful preservation of the whole structure.
APPLIED PHYSICS EXPRESS
(2022)
Article
Nanoscience & Nanotechnology
Jehong Oh, Dongho Kim, Duyoung Yang, Kyungwook Hwang, Junsik Hwang, Jongmyeong Kim, Seungmin Lee, Jungel Ryu, Sohyeon Park, Jai-Kwang Shin, Yongsung Kim, Yongjo Park, Euijoon Yoon, Ho Won Jang
Summary: Microlight-emitting diode (Micro-LED) technology is the only display production method that meets the high-performance requirements of future screens. However, commercialization faces obstacles such as etching loss, efficiency reduction, expensive costs, and long transfer time. The development of the multiple-sapphire nanomembrane (MSNM) technology offers a solution by enabling rapid transfer of micro-LED arrays without singulation. The MSNM technology also improves the stress and threading dislocation density of micro-LEDs, making it promising for commercialization.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Optics
Jacob J. Ewing, Cheyenne Lynsky, Matthew S. Wong, Feng Wu, Yi Chao Chow, Pavel Shapturenka, Michel Iza, Shuji Nakamura, Steven P. Denbaars, James S. Speck
Summary: This article studied the method of achieving highly efficient long-wavelength InGaN LEDs through V-defect engineering, which utilized naturally occurring V-defects for lateral injection and improved the external quantum efficiency.
Article
Engineering, Electrical & Electronic
C. Paranthoen, C. Levallois, G. Brevalle, M. Perrin, A. Le Corre, N. Chevalier, P. Turban, C. Cornet, H. Folliot, M. Alouini
Summary: This study demonstrates the first vertical cavity surface emitting laser (VCSEL) based on InAs quantum dots (QDs) on InP, achieving continuous wave operation at room temperature with low threshold and wavelength tuning capabilities. The QDs exhibit a high density per layer and a thin spacing layer for enhanced modal gain within the VCSEL cavity. Additionally, wavelength tuning experiments show laser emission in a large spectral window with stable output polarization state.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Filip Hjort, Johannes Enslin, Munise Cobet, Michael A. Bergmann, Johan Gustavsson, Tim Kolbe, Arne Knauer, Felix Nippert, Ines Hausler, Markus R. Wagner, Tim Wernicke, Michael Kneissl, Asa Haglund
Summary: This study successfully demonstrates an optically pumped VCSEL emitting in the UVB spectrum at room temperature, providing a new technology for ultraviolet light sources applications.
Article
Optics
Tarcio de Almeida Vieira, Felipe Maia Prado, Niklaus Ursus Wetter
Summary: This study demonstrates laser emission at the 1053 nm transition of Nd:YLF4 using diode-side-pumping at 863 nm. The laser configuration achieves the highest slope efficiency reported for the Nd:YLF4 medium, close to the quantum limit.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Peng Chen, Jian Liu, Jie Xu, Bin Xu, Xiaodan Wang, Xiaodong Xu, Jun Xu
Summary: We report on the recent progress in high-power and broadband wavelength tunability of diode-pumped Tm:CALYO lasers. The use of different pumping geometries and cavity mirrors resulted in higher output powers and wider tunability of the laser wavelengths. Passive Q-switching was also demonstrated, showing shorter pulse widths and higher peak powers.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Ming-Yen Lin, Lee Moay Lim, Siao-Ping Tsai, Feng-Xuan Jian, Shang-Jyh Hwang, Yu-Hsuan Lin, Yi-Wen Chiu
Summary: The study demonstrates that low-dose, narrow-band UVB irradiation at 308 nm is effective in improving vitamin D synthesis in mice, with the optimal recovery dosage for severe vitamin D deficiency being 355 mJ/cm(2) within 3 weeks.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Jae-Hyun Kim, Jin-Kyu Kang, Seung-Chan Lee, Song-Bae Kim
APPLIED CLAY SCIENCE
(2019)
Article
Electrochemistry
Prakash Ramakrishnan, Jung Inn Sohn, Jakkid Sanetuntikul, Jae Hyun Kim
ELECTROCHIMICA ACTA
(2019)
Article
Integrative & Complementary Medicine
Da-Won Jeong, Eun-Young Kim, Jae-Hyun Kim, Bina Lee, SooYeon Hong, Jae Ho Park, Hyuk-Sang Jung, Youngjoo Sohn
EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE
(2019)
Article
Chemistry, Physical
Geon-Ju Choi, Seong-Ho Baek, Sang-Seok Lee, Firoz Khan, Jae Hyun Kim, Il-Kyu Park
JOURNAL OF ALLOYS AND COMPOUNDS
(2019)
Article
Electrochemistry
Liyun Cao, Linlin Wang, Liangliang Feng, Jae-Hyun Kim, Yingying Du, Dan Yang, Lingjiang Kou, Jianfeng Huang
ELECTROCHIMICA ACTA
(2020)
Article
Engineering, Electrical & Electronic
Firoz Khan, Jae Hyun Kim
SOLID-STATE ELECTRONICS
(2020)
Article
Chemistry, Physical
Firoz Khan, Bechir Dridi Rezgui, Jae Hyun Kim
Article
Chemistry, Multidisciplinary
Mohammed Nazim, Jae Hyun Kim
Article
Nanoscience & Nanotechnology
Kyungjun Lee, Hakjeong Kim, Jae Hyun Kim, Dukhyun Choi
SCRIPTA MATERIALIA
(2020)
Article
Energy & Fuels
Firoz Khan, Bechir Dridi Rezgui, Jae Hyun Kim
Article
Chemistry, Multidisciplinary
Mohammed Nazim, Aftab Aslam Parwaz Khan, Abdullah M. Asiri, Jae Hyun Kim
Summary: A facile and environmentally friendly method was used to synthesize porous CuO nanosheets, which were successfully applied as a photocatalyst for degrading organic pollutants/food dyes. The CuO nanosheets demonstrated excellent photocatalytic efficiency and high crystallinity, allowing for rapid degradation of food dyes in a short period of time.
Article
Chemistry, Physical
Eunhui Kim, Hasan Jamal, Injun Jeon, Firoz Khan, Sang-Eun Chun, Jae Hyun Kim
Summary: In this study, flame-retardant organic ionic plastic crystals (OIPCs) were used as a solid plasticizer in composite polymer electrolytes (CPEs) to overcome the challenges associated with solid polymer electrolytes. The introduced 1-butyl-2,3-dimethylimidazolium bromide (BMI-Br) material acts as an ionic liquid and the Li-Br serves as a salt. The resulting BMI-Br-10 CPE demonstrates significant ionic conductivity, wide voltage window, and flame retardancy.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Hasan Jamal, Firoz Khan, Hyeong-Rok Si, Jae Hyun Kim
Summary: Research on solid composite polymer electrolyte using YNa zeolite as a ceramic filler has shown significant improvement in the performance and stability of SS-LMBs by inhibiting lithium dendrite growth. The battery operates stably even at high current densities, with high Li-ion transference number and excellent ionic conductivity.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Physical
Hasan Jamal, Firoz Khan, Suyeon Hyun, Sang Won Min, Jae Hyun Kim
Summary: The article discusses a superior CPE (MZ-CPE) synthesized using modified SSZ-13 (M-SSZ-13) as a ceramic filler, which significantly enhances the performance of Li-metal batteries. The composite polymer electrolyte shows potential as an alternative for solid-state Li-metal batteries.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Nanoscience & Nanotechnology
Mohammed Nazim, Jae Hyun Kim
ACS APPLIED NANO MATERIALS
(2020)