Article
Nanoscience & Nanotechnology
Siliang He, Evgeny Pakhomenko, Russell J. Holmes
Summary: Polar molecules with permanent dipole moments are widely used in OLEDs as ETLs. The spontaneous alignment of these dipoles results in a macroscopic polarization field known as spontaneous orientation polarization (SOP). The presence of SOP in the ETL leads to surface potential and charge accumulation, which can quench excitons and reduce device efficiency.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Yi-Kuan Chen, Jayachandran Jayakumar, Chia-Min Hsieh, Tien-Lin Wu, Chun-Cheng Liao, Jayabalan Pandidurai, Chang-Lun Ko, Wen-Yi Hung, Chien-Hong Cheng
Summary: The TPAmPPC compound is a highly efficient TADF material with excellent optical properties, demonstrating high photoluminescence quantum yields and superior device performance in OLEDs.
ADVANCED MATERIALS
(2021)
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, Multidisciplinary
Nilgun Kayaci, Resul Ozdemir, Mustafa Kalay, N. Burak Kiremitler, Hakan Usta, M. Serdar Onses
Summary: The development of novel physically unclonable functions based on fluorescent organic semiconductors offers unique advantages for versatile and easily processable materials. The demonstrated OLE-PUFs show excellent surface features and optical properties, making them suitable for various substrates and environments. This study highlights the great potential of engineered f-OSCs in the development of new-generation PUFs.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Applied
Lucia Feriancova, Dmitry O. Balakirev, Roman S. Fedorenko, Alexey V. Kuevda, Vasiliy A. Trukhanov, Eugenia A. Svidchenko, Nikolay M. Surin, Svetlana M. Peregudova, Petr V. Dmitryakov, Nikita O. Dubinets, Yuriy V. Fedorov, Martin Putala, Sergey A. Ponomarenko, Dmitry Yu. Paraschuk, Yuriy N. Luponosov
Summary: We report the synthesis of two novel series of thiophene-phenylene co-oligomers with either phenylene or perfluorinated phenylene central core and various electron-withdrawing groups (EWGs). The synthesized oligomers showed thermal stability, crystallinity, low LUMO energies (down to -3.50 eV), narrow bandgaps (down to 1.9 eV), and efficient photoluminescence in the green-deep red spectral regions both in solution and solid-state. The TPCOs with 2-ethylhexyl cyanoacetate EWG were crystallized in large-area single-crystal monolayers, demonstrating their potential as active layers in solution-processed single-layer organic light-emitting transistors.
Article
Engineering, Chemical
Jayaraman Jayabharathi, Venugopal Thanikachalam, Balu Seransenguttuvan, Jagathratchagan Anudeebhana, Sekar Sivaraj
Summary: This article introduces the study of using SnO2-doped organic materials as the photoconductive interlayer in hybrid organic light-emitting diodes (OLEDs). The research found that these interlayer materials can improve the luminance, current efficiency, power efficiency, and external quantum efficiency of the devices, while reducing the turn-on voltage.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Review
Chemistry, Physical
Yanwei Liu, Yunlong Guo, Yunqi Liu
Summary: An organic light-emitting transistor (OLET) combines the characteristics of an organic field-effect transistor (OFET) and an organic light-emitting diode (OLED), allowing for controllable photoelectric coupling conversions. While OLET devices show potential for advanced display technology and multifunctional optoelectronics, they have yet to meet industrial requirements due to limitations in material performance and device fabrication techniques.
Article
Chemistry, Multidisciplinary
Yu Kyung Moon, Ho Jin Jang, Sanju Hwang, Seongsoo Kang, Sinheui Kim, Juwon Oh, Sangheon Lee, Dongho Kim, Jun Yeob Lee, Youngmin You
Summary: This study developed and validated a degradation model for OLEDs with thermally activated delayed fluorescence, unraveling the chemical processes in intrinsic electron-transfer degradation through electrical and spectroscopic investigations. It provides a useful foundation for improving the longevity of OLEDs by building mass balances for key species in emitting layers.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Ming-Hui An, Ran Ding, Gao-Da Ye, Qin-Cheng Zhu, Ya-Nan Wang, Bin Xu, Mei-Li Xu, Xue-Peng Wang, Wei Wang, Jing Feng, Hong-Bo Sun
Summary: Organic single-crystalline semiconductors have attracted significant attention in the field of organic electronics and optoelectronic devices due to their highly ordered structure, high carrier mobility, and low impurity content. The molecular doping technique has shown potential in optimizing the optical and electrical properties of organic semiconductors, with the use of fluorescent dye-molecules as emissive dopants being able to tune emission color. The controllable molecular doping approach can manipulate charge carrier transport properties in organic single crystals, potentially leading to balanced carrier transport and improved device performance.
ORGANIC ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Linyu Cao, Zhi-Qiang Zhu, Kody Klimes, Jian Li
Summary: The tetradentate Pd(II) complexes exhibit promise in efficient and stable OLEDs, with slight changes in ligand structure being able to modify transport capabilities and enhance device lifetime performance.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Dongyang Wang, Jiamin Ding, Xiaojuan Dai, Lanyi Xiang, Dekai Ye, Zihan He, Fengjiao Zhang, Seok-Heon Jung, Jin-Kyun Lee, Chong-an Di, Daoben Zhu
Summary: This article reports on the improvement of thermoelectric performance in polymeric semiconductors by fine-tuning molecular orientation. Films with bimodal molecular orientation show increased doping efficiency, enhanced thermopower, and unexpected improvement in Seebeck coefficient and electrical conductivity, leading to a higher power factor.
ADVANCED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Xin Hu, Gui Xiao, Yiwei Li, Shuo-en Wu, Qian Chen, Ning Li, Xiubao Sui
Summary: This article introduces infrared-light sensing technology and its applications in various fields, points out the difficulties faced by traditional infrared imaging technology, and proposes the advantages of upconversion-type imagers as an important infrared detection and imaging technique. It focuses on the latest advances in upconversion techniques based on organic semiconductors and discusses their potential applications as well as the limitations and challenges they currently face.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Peifu Sun, Feng Zhu, Donghang Yan
Summary: Crystalline organic semiconductors have unique properties that make them suitable for applications in OLEDs, including high carrier mobility, oriented alignment emitting dipoles, and high photon emission. However, it is challenging to fabricate deep-blue crystalline OLEDs with smooth thin films and high photoluminescence quantum yield. The introduced method of organic solid solution (OSS) shows promise in addressing these challenges and improving OLED performance.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Dae Hun Kim, Tae Whan Kim
Summary: Wearable displays are becoming a core technology for communication between machines and humans, but durability under clothing deformation is still an issue. The self-healable OLEDs reported in this study can recover from physical deformations and have a low operating voltage.
Review
Chemistry, Analytical
Lin-Qing Qiu, Qiang Lv, Xue-Dong Wang
Summary: Organic crystals have great potential in optoelectronics due to their tunable properties and excellent characteristics. White-light emission, as a special application, has garnered widespread attention and has been applied in various fields. This article reviews the recent research progress on the design, synthesis, preparation, and application of white light-emitting organic crystals, aiming to promote the understanding and development of these crystals.
Article
Chemistry, Multidisciplinary
Hisahiro Sasabe, Suguru Araki, Shoki Abe, Nozomi Ito, Kengo Kumada, Taito Noda, Yoshihito Sukegawa, Daisuke Yokoyama, Junji Kido
Summary: In this study, a series of thermally and electrically stable hole-transporters were developed, which exhibited high bond dissociation energy, high glass transition temperature, and high triplet energy. These materials prolonged the stability of OLEDs and achieved an operation lifetime of 20,000-30,000 hours.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Taito Noda, Hisahiro Sasabe, Tsukasa Owada, Ryo Sugiyama, Ayato Arai, Kengo Kumada, Hisaki Tsuneyama, Yu Saito, Junji Kido
Summary: In this study, highly soluble multifunctional anthracene derivatives were developed and showed excellent luminescent properties, suitable for both evaporation- and solution-based systems.
Article
Materials Science, Multidisciplinary
Dehao Jiang, Hisahiro Sasabe, Hiroki Arai, Kohei Nakao, Kengo Kumada, Junji Kido
Summary: This study develops orange-red TADF emitters with high solubility and inhibition of concentration quenching through a novel molecular design strategy. The solution-processed OLEDs manufactured in this study achieve high external quantum efficiency and power efficiency.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hisaki Tsuneyama, Hisahiro Sasabe, Yu Saito, Taito Noda, Daiki Saito, Junji Kido
Summary: In this study, highly stable and efficient deep-red OLEDs were achieved by using a novel exciplex host system. The optimized device exhibited a lifetime that was 6.6 times longer than state-of-the-art deep-red OLEDs and maintained a high maximum external quantum efficiency at a low operating voltage.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Editorial Material
Chemistry, Multidisciplinary
Guanting Liu, Hisahiro Sasabe, Kengo Kumada, Hiroki Arai, Junji Kido
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Yuichiro Watanabe, Benjamin M. Washer, Matthias Zeller, Sergei Savikhin, Lyudmila Slipchenko, Alexander Wei
Summary: This study describes a novel manifestation of rigidochromic behavior in a series of tetranuclear Cu(I)-pyrazolate macrocycles, with implications for solid-state luminescence. The findings reveal that the structural effects far from the luminescent core significantly impact the emissions, with the addition of a C4 substituent inducing a blue shift. Additionally, the emissions are primarily mediated through a cluster-centered triplet state.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Natsuo Nagamura, Hisahiro Sasabe, Hiroki Sato, Nozomi Ito, Shoki Abe, Yoshihito Sukegawa, Daisuke Yokoyama, Hironori Kaji, Junji Kido
Summary: Using a tailored high triplet energy hole transport layer is an effective way to improve the efficiency and lifetime of organic light-emitting devices. In this study, two HTL materials were developed and showed excellent performance in terms of external quantum efficiency and operational lifetime in green phosphorescent OLEDs.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Takuma Shimada, Yuichiro Watanabe, Takashi Kajitani, Masayuki Takeuchi, Yutaka Wakayama, Kazunori Sugiyasu
Summary: We propose a simple design concept for a monomer that produces individually separated supramolecular polymer chains. The addition of alkyl chains with different lengths to the monomer prevents the bundling of supramolecular polymers, allowing the preparation of concentrated solutions without gelation, precipitation, or crystallization. Using this solution, we fabricate self-standing films and threads made of supramolecular polymers.
Article
Chemistry, Physical
Shoki Abe, Hisahiro Sasabe, Takeru Nakamura, Misaki Matsuya, Yu Saito, Takanori Hanayama, Suguru Araki, Kengo Kumada, Junji Kido
Summary: This study investigates the performance of dibenzofuran-end-capped hole-transport layer (HTL) in phosphorescent and TADF OLEDs. The research findings reveal that T1DBFBP demonstrates excellent EQE and lifetime.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
S. M. Sabbir Alam, Yuichiro Watanabe, Brooke L. Steeno, Soumyajit Dutta, Halie A. Szilagyi, Alexander Wei, Daniel M. Suter
Summary: NADPH oxidase plays a crucial role in neurite regeneration, regulating the key protein Src2 and cellular filament organization F-actin.
JOURNAL OF NEUROCHEMISTRY
(2023)
Article
Chemistry, Physical
Takeru Nakamura, Hisahiro Sasabe, Shoki Abe, Kengo Kumada, Ryo Sugiyama, Takanori Hanayama, Junji Kido
Summary: In this study, a high-efficiency, long-lifetime, and high color purity green OLED was successfully developed using a BODIPY derivative. Through sophisticated device engineering and reducing carrier accumulation, the optimized device achieved a narrow full width at half maximum of 32 nm, CIE coordinates of (0.28, 0.67), approximately 19% external quantum efficiency, and a lifetime of 14 000 hours. The device stability was 4.7 times longer than previous works and among the best reported in the literature.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Tomoya Kawano, Hisahiro Sasabe, Yu Saito, Yuhui Chen, Yuma Kori, Takeru Nakamura, Shoki Abe, Tomohiro Maruyama, Junji Kido
Summary: This study developed a series of tetrapyridine/triphenyltriazine-conjugated electron transport layers (ETLs) to achieve low-power-consumption organic light-emitting devices (OLEDs) with high stability. The green phosphorescent OLED based on T3PyTRZ showed a low turn-on voltage (V-on) of 2.18 V at 1 cd m(-2), with high external quantum efficiency, power efficiency, and long lifetime. Even at 1000 cd m(-2), the driving voltage was only 2.88 V. This performance is among the best reported to date.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Naoto Yoshida, Hisahiro Sasabe, Hiroki Arai, Yuki Sagae, Yuro Yagi, Keigo Hoshi, Daisuke Yokoyama, Junji Kido
Summary: The horizontal orientation of the emissive transition dipole moment (TDM) of TADF emitters plays a crucial role in the efficiency improvement of OLEDs. By introducing functional groups containing weak hydrogen bonds into the host material, the horizontal orientation ratio (Theta) of the TDM can be significantly increased. The physical parameters of the dispersed emitter also have a strong relationship with the Theta values, with glass transition temperature being another key parameter.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Kengo Kumada, Hisahiro Sasabe, Misaki Matsuya, Naoto Yoshida, Keigo Hoshi, Takeru Nakamura, Haruki Nemma, Junji Kido
Summary: In this study, a series of novel phenylene-bridged MR-TADF emitters with varying numbers of carbazole units were developed. These emitters exhibited sky-blue emission, narrow-band emission, near-unity PLQY, and horizontal molecular orientation. By chemical modifications, the ACQ behavior was reduced and the molecular orientation was greatly enhanced.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Natsuo Nagamura, Hisahiro Sasabe, Hiroki Sato, Takahiro Kamata, Nozomi Ito, Suguru Araki, Shoki Abe, Yoshihito Sukegawa, Daisuke Yokoyama, Hironori Kaji, Junji Kido
Summary: In this study, a new HTM T4DBFHPB was developed for green TADF OLEDs, achieving high efficiency, long operational lifetime, and low-drive voltage simultaneously. The research highlights the importance of a multifunctional HTM with specific characteristics for high-performance TADF OLEDs.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
