Article
Optics
Mengyuan Zhanghu, Byung-Ryool Hyun, Fulong Jiang, Zhaojun Liu
Summary: An investigation into the electrical and optical properties of InGaN micro-scale LEDs emitting at around 530 nm was conducted. The study found that micro-LEDs with sizes of 80, 150, and 200 μm demonstrated excellent device performance, achieving over 10% external quantum efficiency and wall-plug efficiency, as well as ultra-high brightness. Additionally, it was observed that smaller devices with better current spreading exhibited higher efficiency and brightness. Superior green micro-LEDs can serve as a crucial guarantee for various applications.
Article
Materials Science, Multidisciplinary
Sixiang Wang, Yichang Wang, DaeHo Yoon, Tianrong Li, Yuhua Wang
Summary: In this study, a sub-micrometer green phosphor was successfully prepared by doping Mn2+ in a small-sized organic-inorganic hybrid Zn(ii) bromide (C8H20N)2ZnBr4. The resulting (C8H20N)2Zn0.7Mn0.3Br4 exhibited a particle size around 700 nm, an emission peak at 517 nm with a narrow full width at half maximum of 47 nm, a high photoluminescence quantum yield of about 80%, and a stable photoluminescence intensity under continuous UV-light illumination for 30 days. These findings highlight the potential of (C8H20N)2Zn0.7Mn0.3Br4 as a valuable candidate for Mini-LEDs and Micro-LEDs.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Optics
Wei-Ta Huang, Chun-Yen Peng, Hsin Chiang, Yu-Ming Huang, Konthoujam James Singh, Wei-Bin Lee, Chi-Wai Chow, Shih-Chen Chen, Hao-Chung Kuo
Summary: In this study, high -3 dB bandwidth yellow-green InGaN/GaN micro-LEDs grown on polar c-plane GaN substrates are achieved using nanoporous distributed Bragg reflectors and atomic layer deposition technology. The devices exhibit improved external quantum efficiency and hold great promise for future high-speed visible light communication applications.
PHOTONICS RESEARCH
(2022)
Article
Chemistry, Inorganic & Nuclear
Weihong Yuan, Ran Pang, Shangwei Wang, Tao Tan, Jiangyue Su, Xuexia Chen, Ruize Liu, Chengyu Li, Su Zhang, Hongjie Zhang
Summary: We have developed a series of green-emitting persistent luminescence (PersL) phosphors BaY2Al2Ga2SiO12:Ce3+,Bi3+ (BYAGSO:Ce3+,Bi3+) via a defect engineering approach, which can be efficiently activated by blue-light and effectively reduce flicker in AC-LEDs. By investigating the trapping levels related to Bi3+ in BYAGSO:Ce3+,Bi3+ and fabricating an AC-LED device with low flicker, we demonstrate that the BYAGSO:Ce3+,Bi3+ phosphor is a promising candidate for low-flicker AC-LEDs.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
Changkyun Kim, Shuhao Chen, Jin Su Park, Geon-U Kim, Hyunbum Kang, Seungjin Lee, Tan Ngoc-Lan Phan, Soon-Ki Kwon, Yun-Hi Kim, Bumjoon J. Kim
Summary: The study focuses on developing green solvent-processable small molecular acceptors (SMAs) for high-performance organic solar cells (OSCs). It is found that the outer side-chain structure of Y-series SMAs has a significant impact on the performance of OSCs, with YSe-C6 blend achieving the highest power conversion efficiency. The optimized morphology of YSe-C6 blend allows for active layer thickness-independent efficiency, showing potential for large-scale device manufacturing via eco-friendly printing processes.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Green & Sustainable Science & Technology
Chengchao Lv, Jingfei Fan, Chien-Chiang Lee
Summary: The green credit policy significantly improves the green productivity of heavy polluting enterprises, particularly smaller-scale enterprises with lower capital use efficiency, state-owned enterprises, and enterprises in the central and western regions. The impact on green production efficiency is achieved through the financing scale effect and financing cost effect of the green credit policy.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Nanoscience & Nanotechnology
Piotr Caban, Rafal Pietruszka, Jaroslaw Kaszewski, Monika Ozga, Bartlomiej S. Witkowski, Krzysztof Kopalko, Piotr Ku zmiuk, Katarzyna Gwozdz, Ewa Placzek-Popko, Krystyna Lawniczak-Jablonska, Marek Godlewski
Summary: In this study, the effects of different treatments on the surface of gallium arsenide on the external quantum efficiency of photovoltaic cells have been investigated through experiments. Various characterization techniques such as AFM, SEM, XPS, PL, and bandgap measurements were employed to analyze device structures and interface changes. The results showed that the highest EQE value was achieved by initially etching the samples with a citric acid-based etchant, followed by either sulfur passivation or ammonium hydroxide treatment.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2021)
Article
Chemistry, Physical
Biplab Goswami, Basir Ahamed Khan
Summary: The electronic structure of ZnSeQDFullerene nanocomposite system was explored using density-functional tight-binding method, showing its potential as building blocks for photovoltaic devices. The nanocomposite demonstrated favorable band energy alignment for efficient charge separation and delayed electron-hole recombination. Photovoltaic efficiency of ZnSeQD-Fullerene nanocomposite depends on the size of ZnSe QDs, reaching a maximum value of 18%.
COMPUTATIONAL AND THEORETICAL CHEMISTRY
(2021)
Article
Thermodynamics
Mert Temiz, Ibrahim Dincer
Summary: The study evaluates the development of a zero-carbon marine fuel production system driven by solar energy, which produces and stores hydrogen using a floating photovoltaic system, proton exchange membrane electrolyzer, and hydrogen tank for ferry propulsion. Thermo-economic analysis shows that the proposed system has energy and exergy efficiencies of 15.35% and 16.19% respectively in grid-connected mode, with a net present value of 5.06 million Canadian dollars.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Business
Yun Zhang, Xia Fang, Zhenyu Yang, Yuchen Sun, Qiuyu Wang
Summary: The study finds that green finance effectively promotes energy efficiency, and high-quality green technology innovation has a significant impact on energy efficiency. Green finance has a more significant effect on increasing energy efficiency in regions with large-scale economic development and weak environmental regulation. Furthermore, digital technology can amplify the driving effect of green finance on energy efficiency.
EMERGING MARKETS FINANCE AND TRADE
(2023)
Article
Physics, Applied
Xuefeng Li, Nick Pant, Elizabeth DeJong, Abdelrahman Tarief Elshafiey, Rob Armitage, Emmanouil Kioupakis, Daniel Feezell
Summary: In this study, carrier dynamics in c-plane InGaN/GaN LEDs with various emission wavelengths near the green gap were investigated using a small-signal electroluminescence method. The causes of efficiency reduction at longer wavelengths were identified as a decrease in injection efficiency, radiative recombination rate, and an imbalance in Auger-Meitner and radiative terms due to the interplay between carrier-current density relationship and quantum-confined Stark effect. The effects of QCSE, phase-space filling, and carrier-current density relationship on efficiency reduction were examined separately using experimental data and Schrodinger-Poisson calculations.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Ceramics
Xiaoyong Huang, Zhe Xu, Balaji Devakumar
Summary: This paper reports on the preparation, crystal structure, and photoluminescence properties of a novel green-emitting garnet-type phosphor. It was found that the optimal doping concentration of Ce3+ ions is 6 mol%. The synthesized phosphor exhibits high thermal stability and high photoluminescence performance, making it promising for application in high color rendering white LEDs.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Mangey Ram Nagar, Krishan Kumar, Dovydas Blazevicius, Raminta Beresneviciute, Gintare Krucaite, Daiva Tavgeniene, Chen Tun Hao, Subrata Banik, Jwo-Huei Jou, Saulius Grigalevicius
Summary: Solution-processable bipolar carbazole-benzophenone derivatives were successfully synthesized as host materials for green TADF organic LEDs. These hosts exhibited high-triplet energies, balanced charge-transporting properties, and good solubility, leading to excellent device performance.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Priyanka Sehrawat, R. K. Malik, S. P. Khatkar, V. B. Taxak
Summary: New generation electro-optic appliances utilize YAG:Er3+ nanophosphors, showing superior light emission properties suitable for optical sensors, lasers, and cool-WLEDs. The research results indicate excellent performance of the nanophosphors in green emission.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Shouqiang Lai, Chaohsu Lai, Saijun Li, Guolong Chen, Xi Zheng, Tingwei Lu, Zongming Lin, Rongxing Wu, Yijun Lu, Hao-Chung Kuo, Zhong Chen, Tingzhu Wu
Summary: In this study, the temperature-dependent photoluminescence characteristics of green InGaN/GaN multiple quantum wells (MQWs) with InGaN/GaN pre-wells and InGaN pre-layers were investigated, and the electroluminescence properties of the corresponding mini-LEDs were studied. The fitting results of the temperature-dependent photoluminescence spectra using the Vaishini and Arrhenius models showed that the S-shaped temperature-dependent peak energies of green InGaN/GaN MQWs grown on pre-wells and pre-layers originated from localized states, and better crystal quality was observed in the MQWs with pre-layers. Moreover, the electroluminescence properties of green mini-LEDs were compared, demonstrating the advantages of growing green MQWs with an InGaN prelayer.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Physics, Applied
Jun Z. Huang, Hesameddin Ilatikhameneh, Michael Povolotskyi, Gerhard Klimeck
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Physics, Applied
Pengyu Long, Jun Z. Huang, Michael Povolotskyi, Prasad Sarangapani, Gustavo A. Valencia-Zapata, Tillmann Kubis, Mark J. W. Rodwell, Gerhard Klimeck
JOURNAL OF APPLIED PHYSICS
(2018)
Article
Chemistry, Multidisciplinary
Peng Wu, Tarek Ameen, Huairuo Zhang, Leonid A. Bendersky, Hesameddin Ilatikhameneh, Gerhard Klimeck, Rajib Rahman, Albert V. Davydov, Joerg Appenzeller
Article
Engineering, Electrical & Electronic
Tarek A. Ameen, Hesameddin Ilatikhameneh, Patrick Fay, Alan Seabaugh, Rajib Rahman, Gerhard Klimeck
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2019)
Article
Physics, Applied
Timothy B. Boykin, Prasad Sarangapani, Gerhard Klimeck
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Nanoscience & Nanotechnology
Tingting Shen, Daniel Valencia, Qingxiao Wang, Kuang-Chung Wang, Michael Povolotskyi, Moon J. Kim, Gerhard Klimeck, Zhihong Chen, Joerg Appenzeller
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Engineering, Electrical & Electronic
Yuanchen Chu, Shang-Chun Lu, Nadim Chowdhury, Michael Povolotskyi, Gerhard Klimeck, Mohamed Mohamed, Tomas Palacios
IEEE ELECTRON DEVICE LETTERS
(2019)
Article
Physics, Applied
Jana M. Meyer, Jan Scharnetzky, Matthias Berl, Werner Wegscheider, Maik Hauser, Werner Dietsche, Kuang-Chun Wang, Gerhard Klimeck, Lars Tiemann, Robert H. Blick
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Chemistry, Multidisciplinary
Chin-Sheng Pang, Chin-Yi Chen, Tarek Ameen, Shengjiao Zhang, Hesameddin Ilatikhameneh, Rajib Rahman, Gerhard Klimeck, Zhihong Chen
Article
Physics, Applied
Prasad Sarangapani, Yuanchen Chu, James Charles, Gerhard Klimeck, Tillmann Kubis
PHYSICAL REVIEW APPLIED
(2019)
Article
Physics, Applied
Yuanchen Chu, Jingjing Shi, Kai Miao, Yang Zhong, Prasad Sarangapani, Timothy S. Fisher, Gerhard Klimeck, Xiulin Ruan, Tillmann Kubis
APPLIED PHYSICS LETTERS
(2019)
Article
Engineering, Electrical & Electronic
Chin-Yi Chen, Hesameddin Ilatikhameneh, Jun Z. Huang, Gerhard Klimeck, Michael Povolotskyi
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2020)
Article
Engineering, Electrical & Electronic
Chin-Yi Chen, Hsin-Ying Tseng, Hesameddin Ilatikhameneh, Tarek A. Ameen, Gerhard Klimeck, Mark J. Rodwell, Michael Povolotskyi
Summary: The design of THJ-TFETs addresses the low ON-current challenge of TFETs, but faces limitations due to fabrication challenges with respect to device dimensions and material interfaces. The performance of the original THJ-TFET design is improved by engineering the doping profile to boost resonant tunneling efficiency, resulting in better SS and ON-current. Quantum transport simulations are employed to optimize THJ-TFET design in this study, considering the complexity of devices with multiple quantum wells and material interfaces in the tunneling junction.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Nanoscience & Nanotechnology
Wan Sik Hwang, Pei Zhao, Sung Geun Kim, Rusen Yan, Gerhard Klimeck, Alan Seabaugh, Susan K. Fullerton-Shirey, Huili Grace Xing, Debdeep Jena
NPJ 2D MATERIALS AND APPLICATIONS
(2019)
Proceedings Paper
Computer Science, Theory & Methods
Gerhard Klimeck
2019 8TH MEDITERRANEAN CONFERENCE ON EMBEDDED COMPUTING (MECO)
(2019)
