Article
Materials Science, Multidisciplinary
Inge Verboven, Joao Silvano, Ken Elen, Hilde Pellaers, Bart Ruttens, Jan D'Haen, Marlies K. Van Bael, An Hardy, Wim Deferme
Summary: The study demonstrates that ultrasonically spray coating is an excellent printing technique for applying silver nanowires and conductive polymers, forming electrodes with high transparency and conductivity, which have been successfully applied in organic light-emitting diodes.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Chemistry, Physical
J. H. Park, A. K. Harit, C. H. Jang, J-E Jeong, H. Y. Woo, M. H. Song
Summary: This study successfully demonstrated the fabrication of a green-emitting PeLED with excellent performance by incorporating a specific conjugated polyelectrolyte MPS2-TEA into the perovskite solution. The perovskite films with MPS2-TEA showed improved optical properties and lower defect density compared to the pristine films.
MATERIALS TODAY ENERGY
(2021)
Review
Chemistry, Multidisciplinary
Shuping Hou, Jie Liu, Feipeng Shi, Guo-Xu Zhao, Jia-Wei Tan, Gong Wang
Summary: Flexible organic light-emitting diodes and perovskite light-emitting diodes have been investigated, and silver nanowires electrodes are found to have potential applications as transparent conductive electrodes. This mini-review summarizes the advancements in silver nanowires electrodes for LEDs and discusses the relationship between electrode optimization and device performance.
FRONTIERS IN CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Yong-Ho Ra, Cheul-Ro Lee
Summary: A new approach to reduce the size of photonic device chips is reported, utilizing a monolithic light reflector-nanowire LED system. Vertical cavity nanowire structure for surface-lighting emission is developed using selective area epitaxy, with the light reflection provided by Al metal reflector deposited by MBE technique. The approach shows significantly improved light efficiency at specific spectral wavelength, promising a new route for next-generation photonic and electronic devices.
ADVANCED MATERIALS TECHNOLOGIES
(2021)
Article
Nanoscience & Nanotechnology
Jin-Ming Teng, Da-Wei Zhang, Yin-Feng Wang, Chuan-Feng Chen
Summary: Two novel chiral conjugated polymers R-P and S-P with excellent TADF properties and high photoluminescence quantum yields were designed and synthesized in this study. Intense mirror-image circularly polarized luminescence signals were detected from both polymers in solution and film states, and high maximum external quantum efficiencies and brightness were achieved in solution-processed CP-PLEDs. Additionally, intense circularly polarized electroluminescence signals were observed from the CP-PLED devices fabricated with R-P and S-P.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Loganathan Veeramuthu, Chia-Jung Cho, Fang-Cheng Liang, Manikandan Venkatesan, G. Ranjith Kumar, Hua-Yi Hsu, Ren-Jei Chung, Chen-Hung Lee, Wen-Ya Lee, Chi-Ching Kuo
Summary: Wearable skin-inspired electronic skins have made remarkable progress in recent years, with promising features such as comfort, lightweight, and durability, leading to significant advancements in wearable sensors and optoelectronics.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Iain Hamilton, Minwon Suh, Jim Bailey, Donal D. C. Bradley, Ji-Seon Kim
Summary: Modification of the pi-conjugated backbone structure of CPEs and LEPs allows for control of the CPE/LEP interface properties, leading to improved efficiency and response time in PLED devices. However, the formation of a type II heterojunction at the CPE/LEP interface causes interfacial luminance quenching and reduces device efficiency. A deep CPE LUMO is found to be beneficial for fast device turn-on.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Zitang Wei, Kang Wang, Wenchao Zhao, Yao Gao, Qixuan Hu, Ke Chen, Letian Dou
Summary: By synthesizing and incorporating a novel selenophene-containing organic ligand STm into a Sn(ii)-based two-dimensional perovskite, the band offset can be fine-tuned, resulting in high performance and enhanced operational stability in field-effect transistor and light-emitting diode devices.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Chung Hyeon Jang, Ye In Kim, Amit Kumar Harit, Jung Min Ha, Sejeong Park, Young Wook Noh, Ah-young Lee, Kyeong Su Kim, Jae Woong Jung, Han Young Woo, Myoung Hoon Song
Summary: This study reports highly efficient green-emitting PeLEDs by introducing semiconducting molecular additives (Fl-OEGA and Fl-C8A). The conjugated additives exist primarily at the grain boundaries of perovskite, reducing the contact potential difference and residual tensile stress. The PeLEDs with Fl-OEGA show minimal shift in turn-on voltage and less decrease in current density compared to devices with insulating EDEA. Furthermore, the 3D CsPbBr3-PeLEDs achieve the highest external quantum efficiency of 21.3% with the incorporation of semiconducting Fl-OEGA as a new multifunctional additive.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Xinyu Shen, Hua Wu, Xiaoyu Zhang, Meili Xu, Junhua Hu, Jinyang Zhu, Bin Dong, William W. Yu, Xue Bai
Summary: The all-solution process for inorganic perovskite nanocrystals (PNCs) LEDs shows great potential for new-generation illumination and displays, but the challenge lies in the injection barriers and charge injection imbalance. The introduction of CBP into the hole transport layer (HTL) efficiently modulates the charge carrier mobility and energy level, resulting in barrier-free charge injection and optimal performance for solution-processed PNC LEDs. The luminance of red LEDs reaches 2990 cd m(-2) and the external quantum efficiency achieves 8.1%, with improved turn-on voltage and roll-off due to more balanced charge injection.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Applied
M. L. Ligi, A. Abhilash, Sreekanth J. Varma, P. A. Unnikrishnan, S. Prathapan, S. Jayalekshmi
Summary: Two novel segmented block copolymers, NPPV1 and NPPV2, were synthesized and characterized for their substituent effects on properties, structure-property relationships, and suitability for polymer light emitting diodes. The study highlighted the importance of cost-effective synthesis methods in developing polymers for efficient LED design in high frequency blue emission.
Article
Multidisciplinary Sciences
Lizhu Li, Guo Tang, Zhao Shi, He Ding, Changbo Liu, Dali Cheng, Qianyi Zhang, Lan Yin, Zhibo Yao, Lian Duan, Donghao Zhang, Chenggong Wang, Meixin Feng, Qian Sun, Qiang Wang, Yanjun Han, Lai Wang, Yi Luo, Xing Sheng
Summary: Inorganic semiconductor-based microscale light-emitting diodes (micro-LEDs) are proposed as the key solution for next-generation, ubiquitous lighting and display systems, with stacked red, green, and blue (RGB) micro-LEDs demonstrating full-color lighting and displays. Prototype arrays of tandem RGB micro-LEDs show enhanced performance and display capabilities, providing a viable path to advanced lighting and display systems.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Multidisciplinary Sciences
Yifan Yao, Yusheng Chen, Kuidong Wang, Nicholas Turetta, Stefania Vitale, Bin Han, Hanlin Wang, Lei Zhang, Paolo Samori
Summary: A foldable inverted polymer light-emitting diode (iPLED) based on a self-suspended asymmetrical vertical nanoscaffold is reported, exhibiting excellent mechanical robustness and high brightness. Arbitrary emitting patterns can be generated using photolithography and brush painting, with individual pixel resolution of 10 μm. The iPLED can be supported on flexible polyimide foils and recycled by washing and refilling with different conjugated polymers capable of emitting light of different color.
Review
Chemistry, Multidisciplinary
Bas Van der Zee, Yungui Li, Gert-Jan A. H. Wetzelaer, Paul W. M. Blom
Summary: The various contributions to the external quantum efficiency (EQE) of polymer light-emitting diodes (PLEDs) are discussed. It is found that the inclusion of triplet-triplet annihilation (TTA) contributes significantly to the enhancement of EQE in PLEDs.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Kosuke Yasuji, Tomo Sakanoue, Fumihiro Yonekawa, Katsuichi Kanemoto
Summary: The recombination between electrons and holes in electroluminescence processes has never been directly evaluated. In this study, the operation dynamics of light-emitting electrochemical cells were visualized with spectroscopic techniques, leading to a rapid device evaluation.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Yong-Jae Kim, Yonghee Lee, Kangho Park, Chi Won Ahn, Hee-Tae Jung, Hwan-Jin Jeon
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2020)
Article
Chemistry, Physical
Eunji Kim, Byeong-Joo Lee, Kathleen Maleski, Yoonjeong Chae, Yonghee Lee, Yury Gogotsi, Chi Won Ahn
Summary: This study presents a method for fabricating on-chip symmetric MSCs with coplanar interdigitated electrodes using focused-ion-beam process and carbon nanotube electrodes. The micro supercapacitors produced have high areal capacitance with narrow gaps between electrode fingers, while electron beam lithography and photolithography are utilized to create ultra-small footprint devices.
Article
Chemistry, Physical
Yong-Jae Kim, Seon Joon Kim, Darae Seo, Yoonjeong Chae, Mark Anayee, Yonghee Lee, Yury Gogotsi, Chi Won Ahn, Hee-Tae Jung
Summary: Understanding the etching mechanisms of MXene and the influence of etchants on structural features and defects are crucial for improving MXene properties. This study visualizes the etching behavior of the Ti3AlC2 MAX phase at the atomic scale and reveals the etching mechanism for the first time. Differences in etching behavior among different etchants were also observed.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Jae Yeol Park, Yoonsu Shim, Khoi Phuong Dao, Sang-Gil Lee, Jacob Choe, Ho Jun Lee, Yonghee Lee, Yuseon Choi, Joon Ha Chang, Seung Jo Yoo, Chi Won Ahn, Wonyoung Chang, Chan-Woo Lee, Jong Min Yuk
Summary: This study investigated copper antimony sulfide as a sodium storage material, revealing its nonequilibrium sodium insertion pathway through various techniques. Valuable insights were provided for sodium storage in ternary metal sulfides, including the use of alloying elements.
Article
Nanoscience & Nanotechnology
Jinkyu Song, Mee-Ree Kim, Youngtae Kim, Darae Seo, Kyungryul Ha, Tae-Eun Song, Wan-Gyu Lee, Yonghee Lee, Ki-Chul Kim, Chi Won Ahn, Hee Han
Summary: This study reports a method for fabricating junctionless Cu nanowire networks and investigates their properties on flexible substrates. The method involves the formation of a nanostructured Ru seed layer on the substrate, followed by direct electroless deposition of Cu. The research findings demonstrate that the transmittance and sheet resistance of the nanowire networks can be controlled by adjusting the density of Ru nanowires or the electroless deposition time. Moreover, the nanowire networks exhibit excellent durability and heating performance.
Article
Electrochemistry
Darae Seo, Mee-Ree Kim, Jin Kyu Song, Eunji Kim, Jaseung Koo, Ki-Chul Kim, Hee Han, Yonghee Lee, Chi Won Ahn
Summary: In this study, 1D hollow Ti3C2Tx MXene/carbon nanofibers were fabricated and used as anode materials in Li-ion batteries (LIBs). Compared to traditional 2D MXene electrodes, the hollow MX/C nanofibers showed a larger specific surface area and higher energy density in LIBs. This research indicates that the hollow MX/C nanofiber electrode is a promising anode material for high-performance LIBs.
Article
Multidisciplinary Sciences
Sen Gao, Sanghyun Hong, Soohyung Park, Hyun Young Jung, Wentao Liang, Yonghee Lee, Chi Won Ahn, Ji Young Byun, Juyeon Seo, Myung Gwan Hahm, Hyehee Kim, Kiwoong Kim, Yeonjin Yi, Hailong Wang, Moneesh Upmanyu, Sung-Goo Lee, Yoshikazu Homma, Humberto Terrones, Yung Joon Jung
Summary: Researchers have successfully synthesized highly dense and vertically aligned sub-5 nm silicon nanowires with unique lattice reduction and significant phonon and electronic confinement effects. The study provides insights into the chemistry and physics of highly confined silicon quantum nanostructures, and explores their potential applications in nanoelectronics, optoelectronics, and energy systems.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Sanghee Nam, Manmatha Mahato, Kyle Matthews, Robert W. Lord, Yonghee Lee, Pitchai Thangasamy, Chi Won Ahn, Yury Gogotsi, Il-Kwon Oh
Summary: This study reports a new method of growing bimetallic cobalt-manganese organic framework on the MXene surface, which achieves high stability in open structured applications by enhancing oxidation resistance and electrocatalytic properties.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hwajin Yun, Yoonjeong Chae, Eunji Kim, Hong Ki Kim, Sukhyeun Jang, Mu-Hyun Baik, Chi Won Ahn, Yonghee Lee
Summary: This study reports a simple but effective strategy to enhance the stability of delaminated MXenes by passivating vulnerable edges with heterocyclic aromatic amines. The functionalized pyrrole MXenes exhibit long-term anti-oxidation in aqueous solutions and higher electrochemical performance as a supercapacitor.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Mousumi Garai, Manmatha Mahato, Sanghee Nam, Eunji Kim, Darae Seo, Yonghee Lee, Van Hiep Nguyen, Saewoong Oh, Pradeep Sambyal, Hyunjoon Yoo, Ashhad Kamal Taseer, Sheraz Ali Syed, Hee Han, Chi Won Ahn, Jaehwan Kim, Il-Kwon Oh
Summary: A novel MXene-based electro-ionic artificial muscle is reported, which utilizes a titanium carbide hybrid nanoarchitecture to anchor a manganese-based metal-organic framework. The developed artificial muscle exhibits high bending displacement, ultrafast response time, wide frequency response, and exceptional stability. It is successfully demonstrated to mimic eye motions in a doll.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Environmental
Eunji Kim, Jinkyu Song, Tae-Eun Song, Hyeri Kim, Yong-Jae Kim, Yeon-Wha Oh, Sanghee Jung, Il-Seok Kang, Yury Gogotsi, Hee Han, Chi Won Ahn, Yonghee Lee
Summary: This work presents a facile and reliable process for manufacturing on-chip and flexible microsupercapacitor devices. The microfabrication process based on photolithography and solution process enables the fabrication of MXene electrodes on flexible substrates. The resulting microsupercapacitors exhibit excellent capacitance and energy density, as well as customizable features.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
So Yeong Jeong, Yongmin Jeon, Eunji Kim, Gibok Lee, Yeon-Wha Oh, Chi Won Ahn, Eun Hae Cho, Yonghee Lee, Kyung Cheol Choi
Summary: Flexible see-through displays, using MXene material as electrodes, have been developed for various applications, offering improved information flow, safety, situational awareness, and overall user experience. The ultraflexible and environmentally stable MXene-based OLED display can stably operate in air condition for over 2000 h, endure repetitive bending deformation, and maintain environmental stability when exposed to wet surroundings. A matrix-addressable transparent OLED display was also demonstrated that could display letters and shapes.
Article
Mechanics
Yeeun Kim, Eunji Kim, Dohoon Kim, Chi Won Ahn, Byoung Soo Kim, Kyung Hyun Ahn, Yonghee Lee, Jun Dong Park
Summary: MXene, a two-dimensional material with a distinct structure and remarkable mechanical and electrical capabilities, has attracted significant attention. To improve and compensate for its inherent weaknesses, researchers have combined MXene with various polymer additives. Polyethylene glycol (PEG) enhances MXene dispersion and viscoelastic properties, polyethylenimine (PEI) destabilizes MXene to form a viscoelastic network, and polyacrylic acid (PAA) forms a dense network structure through hydrogen bonding. These findings provide valuable insights for the design of MXene-based composites with optimal rheological properties for specific processes like 3D printing and coating.
KOREA-AUSTRALIA RHEOLOGY JOURNAL
(2023)
Article
Chemistry, Physical
Syam Kandula, Eunji Kim, Chi Won Ahn, Jinwoo Lee, Bongjun Yeom, Seung Woo Lee, Jinhan Cho, Hyung-Kyu Lim, Yonghee Lee, Jeong Gon Son
Summary: Anode-free sodium-metal batteries are a promising alternative for high-end batteries due to their high theoretical capacity, low cost, and high abundance. However, they suffer from poor long-term cyclic stability. In this study, mechanically resilient MXene/CNT nano-accordion frameworks (NAFs) were engineered to address this issue and enable efficient sodium deposition.
ENERGY STORAGE MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yoojoo An, Nayeon Kim, Soo Yeong Hong, Arum Jung, Eunji Kim, Yonghee Lee, Jinhan Cho, Bongjun Yeom, Jeong Gon Son
Summary: With the development of human-friendly wearable devices, a composite structure combining 2D cellular graphene/MXene/carbon nanotubes and 3D cellular melamine foam has been introduced to create a stretchable framework for lithium metal electrodes. The hierarchical interpenetrated reentrant microcellular structure allows for stable structural deformability while maintaining high electrical conductivity and mechanical stability. This structure shows great potential for the design of stretchable lithium metal electrodes for high energy density batteries.
Article
Materials Science, Multidisciplinary
Jinfei Dai, Chenjing Zhao, Jie Xu, Hossein Roshan, Hua Dong, Francesco Di Stasio, Fang Yuan, Bo Jiao, Zhaoxin Wu
Summary: In this study, the performance of perovskite nanocrystal light emitting diodes (PNC-LEDs) was enhanced through rational device structure design and the application of high-performance perovskite nanocrystal emitting layers.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Jia-Hua Yeh, Suhendro Purbo Prakoso, Leon Lukhas Santoso, Shi-Ju Chen, Bryan Chiang, Ju-Chieh Cheng, Ru-Ning Zhang, Yu-Cheng Chiu
Summary: This study demonstrates the application of a renewable material called dextrin-SMS in the production of electret filters and transistor memory. Dextrin-SMS material can maintain prolonged electrostatic charges and has a relatively wide memory window, making it suitable for the production of biodegradable face masks and green electronics.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Ahmad Telfah, Qais M. Al-Bataineh, Ahmad A. Ahmad, Rund Abu-Zurayk, Carlos J. Tavares, Johannes Etzkorn, Farzad Foadian
Summary: Polyacrylic acid complexed with polyaniline (PAA/PANI) composite materials have the potential to form organic mixed ion-electron conductive (OMIEC) films, which can be used in optoelectronic and energy storage applications. The composite films are formed through an acid-base reaction, resulting in strong electrostatic interactions and intermolecular hydrogen bonds between PANI and PAA. The separation of PANI-rich domains from PAA-rich matrix in the composite films is observed. The electrical conductivity of the composite films is higher when the content of PANI is 33 wt%, due to the high ionic-electronic coupling at the interface between phase-separated regions.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Min-Chih Hou, Dian Luo, Yu-Ting Huang, Shun-Wei Liu, Chin-Wei Lu, Chih-Hao Chang, Hai-Ching Su
Summary: Light-emitting electrochemical cells (LECs) have great potential for novel emission applications, but their relatively low device efficiency hinders their competitiveness with other emission technologies. A study finds that increasing the concentration of small TiO2 nano-particles in the diffuser film can enhance light extraction and improve the device efficiency of LECs.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Qiaoli Niu, Yao Xu, Jun Yang, Wei Hua, Baoxiang Chai, Zequan Zhang, Yuhui Ma, Wenjin Zeng, Ana Flavia Nogueira, Ruidong Xia
Summary: By introducing CPB as a defect passivation agent in the perovskite precursor solution, the optoelectronic properties of perovskite films can be significantly improved and non-radiative carrier recombination can be effectively suppressed. CPB-modified perovskite solar cells exhibit lower trap-state density and stronger carrier migration capability, leading to enhanced power conversion efficiency and stability.
ORGANIC ELECTRONICS
(2024)
Article
Materials Science, Multidisciplinary
Hulya Ozturk Dogan, Fatma Yildirim, Zeynep Orhan, Ali Ben Ahmed, Mostefa Benhaliliba, Sakir Aydogan
Summary: In this study, efficient self-powered visible and UV photodetectors based on hybrid organic-inorganic materials were demonstrated. The photodetectors showed excellent UV detecting capability and good photoresponsivity.
ORGANIC ELECTRONICS
(2024)
