Article
Physics, Applied
Shun Lu, Manato Deki, Jia Wang, Kazuki Ohnishi, Yuto Ando, Takeru Kumabe, Hirotaka Watanabe, Shugo Nitta, Yoshio Honda, Hiroshi Amano
Summary: The study demonstrated a fabrication process for Ohmic contact on low-doping-density p-type GaN with nitrogen-annealed Mg, achieving reduced contact resistance and a localized contact layer. The mechanism underlying the reduced contact resistance, involving mutual diffusion of Ga and Mg atoms on the interface, was studied using various techniques such as scanning transmission electron microscopy.
APPLIED PHYSICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Gun-Woo Lee, Jae-Hyeok Oh, Sung-Nam Lee
Summary: This study demonstrates the achievement of full-color monolithic LEDs using hexagonal epitaxial lateral overgrowth and pulse modulation modes. By reducing crystal defects and controlling indium incorporation, the LEDs emit red, green, and blue light with the same intensity, leading to the development of high-performance multifunctional lighting sources.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Applied
Vladislav M. Korshunov, Timofey N. Chmovzh, Alexandra Ya Freidzon, Mikhail E. Minyaev, Artem D. Barkanov, Ivan S. Golovanov, Lyudmila V. Mikhalchenko, Igor C. Avetisov, Ilya V. Taydakov, Oleg A. Rakitin
Summary: In this study, two near-infrared emitting dyes were synthesized as active emitting layer in OLEDs, which showed fast luminescence and tunable emission properties. The emission maximum was redshifted by introducing linkers and modifying the geometry. The dyes demonstrated high quantum efficiencies and were used to fabricate OLEDs.
Article
Materials Science, Multidisciplinary
Masoud Ebrahimzadeh, Sari Granroth, Sami Vuori, Marko Punkkinen, Mikko Miettinen, Risto Punkkinen, Mikhail Kuzmin, Pekka Laukkanen, Mika Lastusaari, Kalevi Kokko
Summary: Successful reduction of contact resistivity on p-InP crystals was achieved through wet-chemistry treatments and nanoscale control, improving the durability and conductivity of the devices.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Environmental
Jie Guo, Qiang Hu, Min Lu, Asu Li, Xiaoyu Zhang, Ren Sheng, Ping Chen, Yu Zhang, Jinlei Wu, Yuhao Fu, Guang Sun, William W. Yu, Xue Bai
Summary: Research shows that doping CsCdBr3 NRs with Pb2+ can significantly improve their optoelectronic properties, resulting in a blue emission with a quantum yield of 48% and centered at 459 nm. Additionally, using the optimized NRs as the emissive layer, a blue perovskite LED based on 1D NRs was successfully fabricated.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Physics, Applied
Kazuki Ohnishi, Naoki Fujimoto, Shugo Nitta, Hirotaka Watanabe, Shun Lu, Manato Deki, Yoshio Honda, Hiroshi Amano
Summary: This study demonstrates the precise control of Mg concentration in p-type GaN layers using the halide vapor phase epitaxy method. By adjusting the input partial pressure of MgCl2, the Mg concentration in GaN layers can be effectively controlled. The samples exhibit high structural qualities and the acceptor concentration is in good agreement with the concentration of Mg, suggesting that almost all Mg atoms act as acceptors.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Lihui Liu, Ruimin Dong, Danqing Ye, Yao Lu, Pengfei Xia, Lingling Deng, Yu Duan, Kun Cao, Shufen Chen
Summary: The study proposes phosphomolybdic acid (PMA) as a novel p-type chemical dopant for graphene, achieving a monolayer graphene electrode with lower sheet resistance and work function while maintaining high transmittance. PMA-doped graphene shows improved efficiency in organic and perovskite light-emitting diodes, demonstrating the potential of PMA as a p-type chemical dopant for ideal graphene electrodes.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Islam Mohammad Shafiqul, Raj Deep, Jie Lin, Toshiyuki Yoshida, Yasuhisa Fujita
Summary: In this study, nitrogen-doped zinc oxide nanoparticles were successfully synthesized using the gas evaporation method with DC arc plasma. The nitrogen concentration was found to have an impact on the Raman spectra and photoluminescence spectra of the nanoparticles.
Article
Chemistry, Multidisciplinary
Geon-Hui Lee, Cheonhoo Jeon, Jee Won Mok, Sangbaie Shin, Su-Kyoung Kim, Hye Hyeon Han, Seong-Jong Kim, Sang Hoon Hong, Hwanhee Kim, Choun-Ki Joo, Jae-Yoon Sim, Sei Kwang Hahn
Summary: A noninvasive smart wireless LED contact lens has been developed for the treatment of diabetic retinopathy, showing significantly improved compliance, reduced retinal vascular hyper-permeability, and confirmed safety and feasibility for treating the condition. This platform technology has the potential for various biomedical photonic applications.
Article
Chemistry, Physical
Kyunghan Ahn, Ga Hye Kim, Se-Jun Kim, Jihyun Kim, Gi-Seong Ryu, Paul Lee, Byungki Ryu, Jung Young Cho, Yong-Hoon Kim, Joohoon Kang, Hyungjun Kim, Yong-Young Noh, Myung-Gil Kim
Summary: This study reports the synthesis of highly conductive transparent p-type sulfur-doped CuI (CuI:S) thin film using a liquid-iodination method with a thiol additive. The CuI:S film exhibits a remarkably high electrical conductivity and optical transmittance, achieving a record-high figure of merit (FOM) value. The CuI:S electrode is successfully utilized in transparent electronic devices.
CHEMISTRY OF MATERIALS
(2022)
Article
Physics, Applied
Joonho Back, Vincent Rienzi, Matthew S. Wong, Hongjian Li, Steven P. DenBaars, Claude Weisbuch, Shuji Nakamura
Summary: Blue semipolar InGaN microcavity light-emitting diodes (MC-LEDs) with cavity lengths of 113, 205, and 290 nm were successfully fabricated, showing the potential for ultra-thin MC-LEDs. The peak external quantum efficiencies (EQEs) of these MC-LEDs varied depending on the quantum well (QW) positions within the cavity, with the 290 nm cavity length MC-LED achieving the highest peak EQE of 6.7%. The emission characteristics of the MC-LEDs remained consistent at a peak wavelength of 430 nm under different current densities during pulsed operation.
APPLIED PHYSICS EXPRESS
(2021)
Article
Chemistry, Physical
Kyung Rock Son, Seok Hee Hong, Min Ji Yu, Tae Geun Kim
Summary: This study demonstrates the use of electric-field-induced doping treatment (EDT) to achieve high-performance GaN mu LEDs with a thermally stable and highly conductive GaOx thin-film electrode. The proposed GaOx electrode exhibits high transmittance, low contact resistance, and stability under high temperature. The formation of conductive channels in the GaOx electrode enables efficient hole injection into the mu LED pixels.
APPLIED SURFACE SCIENCE
(2022)
Article
Optics
Zhe Zhuang, Daisuke Iida, Martin Velazquez-Rizo, Kazuhiro Ohkawa
Summary: The study introduced a method for fabricating ultra-small InGaN μLEDs, successfully realizing different shapes of green μLEDs. It was found that as the size of the μLED decreases, the series resistance and turn-on voltage increase, while the light output power density and external quantum efficiency also improve.
Article
Optics
Muhammad Usman, Tariq Jamil, Muhammad Aamir, Abdullrahman Abdullah Alyemeni
Summary: In this study, a thin AlInN electron-blocking layer (EBL) is proposed to replace the conventional AlGaN EBL in III-nitride ultraviolet light-emitting diodes (UV LEDs). Numerical results show that the UV LED with thin AlInN improves the optoelectronic performance and reduces sensitivity to p-doping. The thin AlInN layer facilitates hole transportation through intra-band tunneling and effectively suppresses electron leakage, resulting in a considerably enhanced carrier radiative recombination rate and alleviated efficiency droop in the proposed LED.
OPTICAL ENGINEERING
(2023)
Article
Materials Science, Ceramics
X. Vendrell, E. L. Santos-Veiga, H. Beltran-Mir, E. Cordoncillo, L. Mestres
Summary: Heterovalent B-site MgO substitution in the Nd2Zr2O7-system has been investigated and its effects on the structure and electrical behavior of the materials were characterized. The study reveals that heterovalent dopants can significantly enhance the oxide-ion conductivity of pyrochlore-like materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
