Article
Chemistry, Multidisciplinary
Yunping Zhao, Yixiao Niu, Wei Shi, Zhen Zhang, Xuyong Yang, Bin Wei, Yudong Pang, Wai-Yeung Wong
Summary: In this study, a light out-coupling layer composed of Ag nanoparticles and MoOx was introduced on top of the inverted top-emitting OLED. The LOCL significantly improved the light output-coupling of the OLED and protected the sensitive electron injection material, resulting in enhanced device performance. The current efficiency and external quantum efficiency of the OLED were increased by 53% and 30%, respectively.
ADVANCED MATERIALS INTERFACES
(2022)
Review
Chemistry, Multidisciplinary
Nancy C. Forero-Martinez, Kun-Han Lin, Kurt Kremer, Denis Andrienko
Summary: The field of organic semiconductors is diverse and challenging, with a wide range of potentially suitable molecular compounds. Computational methods play a crucial role in virtual screening, balancing efficiency and accuracy. This article discusses the fundamentals of virtual screening and provides examples of chemical design and applications.
Article
Chemistry, Multidisciplinary
Rachith Shanivarasanthe Nithyananda Kumar, Maarten Eerdekens, Yovan de Coene, Veda Sandeep Nagaraja, Shabnam Ahadzadeh, Melissa Van Landeghem, Thierry Verbiest, Wim Deferme
Summary: The spatial and surface coverage dependence of plasmonic gold nanoparticles is controlled by a roll-to-roll compatible ultrasonic spray coating technique, resulting in enhanced fluorescence and charge transport in organic light emitting diodes. Two-photon fluorescence microscopy shows a 2-fold enhancement in multi-photon fluorescence for gold nanoparticles stabilized by polystyrene sulfonate (PSS) located 10 nm away from the super yellow fluorophore. Fluorescence enhancement, combined with approximately 2% surface coverage of PNPs, leads to a 33%, 20%, and approximately 40% increase in electroluminescence, luminous efficacy, and external quantum efficiency, respectively.
NANOSCALE ADVANCES
(2023)
Article
Physics, Applied
C. Symonds, V. Toanen, A. Gassenq, J. -m. Benoit, A. Pereira, E. Cleyet-Merle, R. Fulcrand, F. Bessueille, S. Minot, M. Morassi, A. Lemaitre, J. Bellessa
Summary: This Letter presents a fabrication process for current injection into micrometer-size Ag/GaAs Tamm emitting diodes with special care to avoid surface damages. Electroluminescence from GaAs quantum wells is demonstrated at room temperature, showing dispersion following the Tamm mode. Additionally, for small diameters Tamm structures, electroluminescence occurs in discretized energy modes due to in-plane confinement. This observation of electrically excited emission from a confined diode is a significant advancement towards Tamm plasmon optical devices with novel functionalities.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Jin-Hoon Kim, Jin-Woo Park
Summary: An intrinsically stretchable organic light-emitting diode, made of highly stretchable constituent materials, is able to emit light under strains as large as 80%. It has a low turn-on voltage of 8 V and a maximum luminance of 4400 cd m(-2) from both the anode and cathode sides. The device can withstand repeated stretching cycles up to 200 times and shows improved light-emitting efficiency with small stretches up to 50%.
Article
Chemistry, Multidisciplinary
Zoi Georgiopoulou, Apostolis Verykios, Kalliopi Ladomenou, Katerina Maskanaki, Georgios Chatzigiannakis, Konstantina-Kalliopi Armadorou, Leonidas C. C. Palilis, Alexander Chroneos, Evangelos K. K. Evangelou, Spiros Gardelis, Abd. Rashid bin Mohd Yusoff, Athanassios G. G. Coutsolelos, Konstantinos Aidinis, Maria Vasilopoulou, Anastasia Soultati
Summary: In this study, carbon nanodots are shown to play a beneficial role as electron transport materials in OLEDs and OSCs. The properties of both pristine and nitrogen-functionalized carbon dots are systematically studied using various techniques to uncover their energetic alignment and interaction with the organic semiconductor's emissive layer. The results reveal significant improvements in the current and luminescent characteristics of the OLED devices, mainly due to a decrease in electron injection barrier. The power conversion efficiency of the OSCs using carbon dots as cathode interfacial layers also increases by nearly 10% compared to the reference device. The use of low-cost solution-processed materials in OLEDs and OSCs has the potential for widespread implementation in large-area applications.
Review
Chemistry, Multidisciplinary
Qian Lu, Zhichun Yang, Xin Meng, Youfeng Yue, Muhammad Ashfaq Ahmad, Wenjun Zhang, Shasha Zhang, Yiqiang Zhang, Zonghao Liu, Wei Chen
Summary: Organic light emitting diodes, organic photovoltaics, and perovskite solar cells are vulnerable to degradation induced by moisture and oxygen, requiring robust encapsulation techniques with high barrier performance against these elements for protection. The advantages and disadvantages of various encapsulation technologies and materials, along with their applications in different devices, have been compared. Ongoing challenges and future perspectives in the field of encapsulation have also been addressed.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Do-Yeong Shin, Taehwan Kim, Ozgun Akyuz, Hilmi Volkan Demir, In-Hwan Lee
Summary: This study presents an improved efficiency design for white LEDs by integrating blue nanorod LEDs with green and red-emitting perovskite nanocrystal films. The design utilizes the localized surface plasmon effect of Ag@SiO2 nanoparticles to enhance the photoluminescence intensity of blue LEDs, while the high-power blue LED backlight improves the perovskite photoluminescence intensity. The resulting white LED with Ag@SiO2 nanoparticle-embedded nanorods demonstrates a 62% increase in photoluminescence intensity compared to planar white LEDs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Mengwei Gao, Yuanbo Song, Yidan Liu, Wentao Jiang, Jianchao Peng, Liyi Shi, Rongrong Jia, Yaseen Muhammad, Lei Huang
Summary: In this study, a novel approach was proposed to fabricate Au@MnO2 core/shell assembled nanosheets utilizing the localized surface plasmon resonance (LSPR) effect of gold nanoparticles. The reduction of KMnO4 to MnO2 on Au NPs under 520 nm light resulted in the gradual assembly into thin sheeted morphology. The significance of irradiation conditions and surface functional groups, particularly the 520 nm light and citrate group, in the formation of stable Au@MnO2 core-shell assembled nanosheets was systematically studied. The controllable, green, and facile nature of this approach allows for its extension to synthesize other complex nanomaterials for various applications.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Hakjun Lee, Hyewon Nam, Hyo-Jin Yeo, Heesun Yang, Taekyung Kim
Summary: By utilizing the localized surface plasmon resonance (LSPR) effect, the theoretical efficiency limit of fluorescence organic light-emitting diodes (OLEDs) was surpassed, and the interaction between polaritons and plexcitons during the LSPR process was experimentally analyzed. The external quantum efficiency (EQE) significantly increased from 6.01% to 15.43%, exceeding the theoretical efficiency limit of fluorescent OLEDs. A new concept of LSPR sensitizer was introduced, allowing for simultaneous improvement in color conversion and efficiency through cascade transfer of the LSPR effect. To date, our LSPR-OLED has achieved the highest EQE and current efficiency among LSPR-based fluorescent OLEDs.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Shu-Jen Wang, Anton Kirch, Michael Sawatzki, Tim Achenbach, Hans Kleemann, Sebastian Reineke, Karl Leo
Summary: Conventional organic optoelectronic devices have low carrier mobility due to disorder. This study presents monolithic integrated triclinic crystal rubrene light-emitting diodes (LEDs) with engineered functional additives. The crystalline LEDs show superior charge transport, operational stability, and long-term stability. However, the crystalline phase reduces the overall performance compared to amorphous rubrene in terms of exciton dynamics and annihilation rates. The potential applications of rubrene and/or its derivatives crystalline films for improving the performance of organic and hybrid optoelectronic devices are discussed.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Ping Li, Zijie Wang, Wenjing Li, Jie Yuan, Runfeng Chen
Summary: This study utilizes machine learning models to predict the ISC and RISC rates of TADF molecules, proposes novel descriptors for prediction, and identifies candidate TADF molecules with high ISC and RISC rates.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Xiaohua Zhao, Siyao Wang, Kaixin Yang, Xinya Yang, Xiang Liu
Summary: The feasibility of visible light-driven organic transformations was studied, and a stable and adjustable nanocatalyst was designed, which achieved efficient photocatalytic reactions.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Zaifa Du, Hongjuan Feng, Yongzhen Liu, Penghao Tang, Fengsong Qian, Jie Sun, Weiling Guo, Jibin Song, Enguo Chen, Tailiang Guo, Qun Yan
Summary: This study demonstrates a localized surface plasmon (LSP) coupling nanorod mu LED with graphene as a transparent conductive electrode structure. The mu LED with LSP coupling shows an enhancement of about 36% in external quantum efficiency and 84% in photoluminescence measurements compared to the LSP-free sample. This enhancement is achieved through the large sidewall area provided by the nanorod structure and the zero distance contact between the nanoparticles and nanorods.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Bin Zhao, Lixuan Chen, Wenyong Liu, Longjia Wu, Zizhe Lu, Weiran Cao
Summary: By adding effective surfactants, the performance of blue quantum dot light emitting diodes (QLEDs) with low bandgap shell structures is enhanced, achieving a significant increase in photoluminescence quantum yield and external quantum efficiency.
Review
Materials Science, Multidisciplinary
Dong Jin Kang, Lola Gonzalez-Garcia, Tobias Kraus
Summary: Soft electronic devices enable new types of products for an ergonomic interaction of humans with a digital environment. The inkjet printing of electrically conductive ink onto soft, porous substrates such as paper, textile, and polymers offers an efficient, cost-saving, and fast prototyping and small-scale production method for soft electronics. This review focuses on recent developments in inkjet printing of metal inks onto soft substrates, discussing the principles of inkjet printing, the influence of substrate porosity on ink behavior, and the current challenges and achievements in this field.
FLEXIBLE AND PRINTED ELECTRONICS
(2022)
Article
Nanoscience & Nanotechnology
Tan Ngoc-Lan Phan, Jin-Woo Lee, Eun Sung Oh, Seungjin Lee, Changyeon Lee, Taek-Soo Kim, Sheng Li, Bumjoon J. Kim
Summary: Organic solar cells (OSCs) based on conjugated block copolymers (CBCs) have gained attention for their simple solution process, but their power conversion efficiencies (PCEs) need improvement. In this study, a new CBC (PBDB-T-b-PY5BDT) was developed, and efficient and stable OSCs were achieved through a halogen-free solution process. The CBC-based OSCs showed better photovoltaic performance, device stability, and mechanical robustness compared to binary all-polymer solar cells and CRC-based OSCs.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Seungseok Han, Kyungmin Kim, Sang Yeon Lee, Seongjun Moon, Jung-Yong Lee
Summary: A novel stretchable film based on an over-layered liquid-metal network is proposed. An intentionally oxidized interfacial layer enables the formation of uninterrupted indium and gallium nanoclusters, creating additional electrical pathways under mechanical deformation. The films exhibit gigantic negative piezoresistivity (G-NPR), reducing resistance by up to 85% during the initial 50% stretching. The rupture of metal oxides allows the formation of liquid eutectic gallium-indium (EGaIn) and the connection of the over-layered networks to build new electrical paths.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Dongmin Lee, Yongchan Jang, Jeonga Kim, Sang Young Jeong, Han Young Woo, Donggu Lee, Jongbok Kim, Youngmin Lee, Changyeon Lee, Wonho Lee
Summary: Non-fullerene acceptor-based polymer solar cells (NFA-PSCs) with high morphological stability may not necessarily exhibit high thermal stability. Our study shows that NFA-PSCs comprising PTB7-Th:ITIC-4F and PBDB-T-2Cl:ITIC-4F blends have stable morphologies at a high temperature of 110°C, but degrade severely, resulting in a reduction in efficiency. Penetration of metal oxide molecules into the photoactive layer upon heating is identified as the cause of degradation.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Nanoscience & Nanotechnology
Jeonghwan Park, Jin Suk Myung, Duho Cho, Taesu Kim, Su Yeon Lee, Yunseok Kim, Youngmin Choi, Sungmook Jung
Summary: A hydrophilic solution process is used to fabricate a stretchable conductive composite, improving conductivity and minimizing changes in electrical properties during stretching, resulting in a composite with excellent elastic durability.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Daehee Han, Geon-U Kim, Dongchan Lee, Chulhee Lim, Seungjin Lee, Dahyun Jeong, Shinuk Cho, Changyeon Lee, Bumjoon J. J. Kim
Summary: A new type of noncovalently fused polymer solar cell material has been developed, which enables high-efficiency fabrication. By controlling the molecular orientation of the material, high charge transport efficiency and low losses are achieved, leading to improved performance of the solar cell.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sanghyeok Park, Dongha Kim, Yun-Seok Choi, Arthur Baucour, Donghyeong Kim, Sangho Yoon, Kenji Watanabe, Takashi Taniguchi, Jonghwa Shin, Jonghwan Kim, Min-Kyo Seo
Summary: Researchers developed a meta-mirror platform to customize the radiative decay rate and polarization correlation of excitons in TMDCs. By altering the optical layout, the radiative decay rate could be reduced by two orders of magnitude and a statistical correlation between emission intensity and spectral line width was observed. This platform shows great potential for tailoring the two-dimensional distributions of lifetime, density, diffusion, and polarization of TMDC excitons in advanced opto-excitonic applications.
Article
Optics
Mohamad Reza Nurrahman, Dongha Kim, Kwang-Yong Jeong, Kyoung-Ho Kim, Chun-Ho Lee, Min-Kyo Seo
Summary: By using the truncated nano-cone resonator and employing the base angle as a structural degree of freedom, the Q-BIC resonance with a high Q-factor of >150 over a wide wavelength range of > 100 nm can be achieved. Our approach is expected to boost the utilization of Q-BIC resonance in various applications requiring broadband spectral tuning.
Article
Chemistry, Multidisciplinary
Changjo Kim, Irem Kozakci, Sang Yeon Lee, Byeongsu Kim, Junho Kim, Jihyung Lee, Boo Soo Ma, Eun Sung Oh, Taek-Soo Kim, Jung-Yong Lee
Summary: This study proposes a facile approach to improve the mechanical stability of CQD solar cells without compromising the high power conversion efficiency. By introducing (3-aminopropyl)triethoxysilane (APTS) on CQD films, the dot-to-dot bonding is strengthened, making the treated devices robust to mechanical stress. The device maintains 88% of the initial PCE under 12,000 cycles at a bending radius of 8.3 mm and achieves a PCE of 11.04%, one of the highest PCEs in flexible PbS CQD solar cells.
Article
Chemistry, Physical
Jin-Woo Lee, Cheng Sun, Changyeon Lee, Zhengping Tan, Tan Ngoc-Lan Phan, Hyesu Jeon, Dahyun Jeong, Soon-Ki Kwon, Yun-Hi Kim, Bumjoon J. Kim
Summary: In this study, efficient and stable organic solar cells (OSCs) were achieved by developing a series of dimerized small-molecule acceptors (DSMAs). Three different DSMAs (DYT, DYV, and DYTVT) were prepared using different linkers (thiophene, vinylene, and thiophene-vinylene-thiophene) to connect their two Y-based building blocks. The highest power conversion efficiency (PCE) of 18.60% was achieved by a DYV-based OSC, which exhibited appropriate backbone rigidity, optimal blend morphology, and high electron mobility. Additionally, the DYV-based OSC demonstrated excellent operational stability with a lifetime of 4005 h under 1-sun illumination.
ACS ENERGY LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Jung-Hwan Song, Philippe Lalanne, Min-Kyo Seo, Mark L. L. Brongersma
Summary: Mean-field theory-based models are commonly used for designing optical metamaterials. However, for applications involving layered device architectures, the dispersive properties and interfacial boundary conditions of the metamaterials need to be considered. In this study, we propose a method to calculate the optical transfer function for one-dimensional optical metamaterials, taking into account the dispersive properties of the effective index and the effective interfacial impedance.
Article
Chemistry, Physical
Eul-Yong Shin, So Hyun Park, Yeonjee Jeon, Kyuyeon Kim, Giseok Lee, Jung-Yong Lee, Hae Jung Son
Summary: The stretchability of PEDOT:PSS electrodes is influenced by two additives, PEG and GOPS. PEG forms hydrogen bonds with the sulfonyl groups of PSS, relieving mechanical stress in the PEDOT:PSS films. On the other hand, GOPS not only forms hydrogen bonds with PSS but also undergoes a chemical reaction to create a cross-linked structure, enhancing the stretchability of the PEDOT:PSS film. Additionally, GOPS promotes a more hydrophilic surface and improves adhesion to the upper layer in IS-OPV devices, resulting in improved stretchability and solar cell performance.
ACS APPLIED ENERGY MATERIALS
(2023)
Correction
Chemistry, Physical
Jihwan Jo, Seonju Jeong, Dongchan Lee, Seungjin Lee, Bumjoon J. Kim, Shinuk Cho, Jung-Yong Lee
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Jihwan Jo, Seonju Jeong, Dongchan Lee, Seungjin Lee, Bumjoon J. Kim, Shinuk Cho, Jung-Yong Lee
Summary: The random mixing of donor and acceptor materials in organic solar cells is considered a breakthrough in the development of these cells. However, the vertically separated donor and acceptor structures of the cells allow for individual optimization of each material, improving charge extraction and reducing charge recombination. Additionally, the phase separation in organic solar cells enhances their stability.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
