Article
Materials Science, Multidisciplinary
Gyu Jin Choi, Jeong Won Ryu, Ji-Young Jeong, Tae-Jin Je, Dong Ki Yoon, Jin Seog Gwag
Summary: The study shows that combining an organic light-emitting display (OLED) device with an advanced optical film can achieve highly enhanced light extraction and low ambient light reflection without the need for a polarizer. The optical efficiency of the OLED device with the proposed film has been significantly improved compared to a polarizer-based OLED device, with external light reflection reduced to approximately 10%. Experimental data confirms that the film for enhancing optical efficiency (FEOE) improves the overall optical efficiency of OLED devices, making FEOE-based OLEDs of significant interest in materials science and display devices.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Multidisciplinary
Yungui Li, Bas van der Zee, Xiao Tan, Xin Zhou, Gert-Jan A. H. Wetzelaer, Paul W. M. Blom
Summary: This work presents a device design principle for highly efficient and long-lived TADF OLEDs by tuning the optical cavity of single-layer undoped devices. The designed OLEDs show a maximum external quantum efficiency of 16% and an increased lifetime compared to the conventional devices. The study also reveals the empirical relation between OLED lifetime and light intensity, providing insights into improving the operational stability of OLEDs.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hui Li, Ryutaro Komatsu, Jihane Hankache, Hisahiro Sasabe, Latevi Max Lawson Daku, Bilal ozen, Songjie Chen, Jurg Hauser, Andreas Hauser, Silvio Decurtins, Junji Kido, Shi-Xia Liu
Summary: A series of bis(triphenylamine)benzodifuran chromophores have been synthesized and fully characterized, with compounds containing vinyl linkers showing stronger electronic interactions between the TPA and BDF moieties. One of the compounds has been applied as a dopant emitter in OLEDs, exhibiting a high external quantum efficiency exceeding the theoretical upper limit.
FRONTIERS IN CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Wen Chen, Meixin Feng, Yongjun Tang, Jian Wang, Jianxun Liu, Qian Sun, Xumin Gao, Yongjin Wang, Hui Yang
Summary: GaN-on-Si resonant-cavity light-emitting diodes (RCLEDs) were successfully fabricated through wafer bonding and Si substrate removal. The double-sided dielectric distributed Bragg reflectors formed a high-quality optical resonant cavity, showing good spectral characteristics. High data transmission rates and low-cost emitters make them advantageous for future visible light communications.
Article
Chemistry, Multidisciplinary
Yu-Jin Kim, Sung-Won Kim, Ju-Ro Lee, Soong Ho Um, Yoon Ki Joung, Suk Ho Bhang
Summary: This study investigated the cytotoxic effects of LED and OLED light sources on stem cells, finding that the LED group induced higher apoptotic activity due to significant heat generation compared to OLED. Additionally, the LED group showed significant expression of intracellular reactive oxygen species, while increased cell proliferation was confirmed in the OLED group.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2021)
Review
Computer Science, Information Systems
Yubu Zhou, Huayu Gao, Jing Wang, Fion Sze Yan Yeung, Shenghuang Lin, Xianbo Li, Shaolin Liao, Dongxiang Luo, Hoi Sing Kwok, Baiquan Liu
Summary: Organic light-emitting diodes (OLEDs) are a promising technology for displays and lighting due to their numerous advantages. Ultrathin emitting nanolayers (UENs) have been used to develop OLEDs without the doping technique, simplifying device structure and achieving comparable performance to doped devices. This review comprehensively summarizes recent progress in UEN-based OLEDs, including a comparison between doped and doping-free OLEDs, effective design approaches, and future development prospects.
Article
Chemistry, Multidisciplinary
Philipp Grimm, Stefan Zeissner, Maximilian Roedel, Simon Wiegand, Sebastian Hammer, Monika Emmerling, Enno Schatz, Rene Kullock, Jens Pflaum, Bert Hecht
Summary: This study presents a nanoscale organic light-emitting antenna (OLEA) structure that serves as a color- and directionality-switchable light source. The structure utilizes gold nanoantennas and an organic semiconductor to achieve color and emission direction switching based on the polarity of the applied voltage. The OLEA structure facilitates efficient radiation transfer and eliminates the need for transparent electrodes.
Article
Engineering, Electrical & Electronic
Wei Ou, Yang Mei, Daisuke Iida, Huan Xu, Minchao Xie, Yiwei Wang, Lei-Ying Ying, Bao-Ping Zhang, Kazuhiro Ohkawa
Summary: In this study, InGaN-based orange-red RCLEDs were successfully fabricated using a unique structure and technique, achieving low optical loss in the resonant cavity. The performance of the devices was validated through far-field emission observation and simulation, demonstrating the consistency between performance and design. This research is of significance for the development of displays and communication systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Je-Heon Oh, Jin-Woo Park
Summary: Researchers have developed a stretchable phosphorescent light-emitting layer for organic light-emitting diodes (is-OLEDs) by blending additives with a polymer host and emitting dopant. By changing the emitting dopant, they were able to control the emission colors and improve the mechanical and electrical properties of the stretchable OLEDs.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Tiantian Zhang, Yuxin Xiao, Hailan Wang, Shuting Kong, Rongjuan Huang, Vonika Ka-Man Au, Tao Yu, Wei Huang
Summary: Thermally activated delayed fluorescence (TADF) materials, particularly highly twisted TADF emitters, have shown great potential in the field of organic light-emitting diodes (OLEDs). These highly twisted TADF emitters exhibit multi-channel charge-transfer characters and rigid molecular structures, suppressing non-radiative decay processes and enhancing exciton utilization for efficient OLED performance. This review summarizes recent progress, molecular design strategies, photophysical studies, and device performances of highly twisted TADF materials and OLEDs, while also discussing the challenges and future prospects in this area.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Jaber Saghaei, Manikandan Koodalingam, Paul L. Burn, Almantas Pivrikas, Paul E. Shaw
Summary: The study investigated solution-processed monochrome and white OLEDs with stable performance characteristics under different scan frequencies. By adjusting the ratio of blue, green, and red emissive materials in the light-emitting layer, white emission was achieved with optimal blend ratio providing high efficiency white OLEDs.
ORGANIC ELECTRONICS
(2022)
Article
Polymer Science
Young-Sam Park
Summary: The study shows that the generation of nano-lens is dominant when the heating temperature increases from 300 to 320 degrees C, while the growth becomes dominant from 320 to 340 degrees C, which can be explained by Ostwald ripening and coalescence. Additionally, an increase in temperature and dwell time results in a higher area ratio of nano-lens to substrate, attributed to the increased vapor generation during heating.
Article
Biochemistry & Molecular Biology
Seok Je Lee, Jun Li, Seung Il Lee, Chang-Bum Moon, Woo Young Kim, Jin Cao, Chul Gyu Jhun
Summary: The study found that by controlling molecular ordering, the electro-optical characteristics of OLEDs can be improved, enhancing device performance. OLEDs with ordered molecules exhibited lower turn-on voltage, higher luminance, and better electrical properties compared to conventional OLEDs.
Article
Chemistry, Multidisciplinary
Cheng-Jie Wang, Ying Ke, Guo-Yi Shiu, Yi-Yun Chen, Yung-Sen Lin, Hsiang Chen, Chia-Feng Lin
Summary: This study achieved directional emission properties and narrow linewidth in InGaN-based resonant-cavity light-emitting diodes through a simple wet etching process to transform the epitaxial structures into distributed Bragg reflector structures.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Applied
Lu Zhou, Wen-Cheng Chen, Ji-Hua Tan, Shaomin Ji, Qingdan Yang, Yingxiao Mu, Hao-Li Zhang, Jingwei Zhao, Yanping Huo, Chun-Sing Lee
Summary: Two donor-acceptor type blue luminophores based on an azaryl-ketone derivative have been developed for OLEDs, showing aggregation-induced emission and charge transfer characteristics. They exhibit versatile applications as emitters in blue OLEDs and hosts in red phosphorescent devices, with decent performance and mild efficiency roll-offs.
Article
Materials Science, Multidisciplinary
Riccardo Miscioscia, Fausta Loffredo, Giuseppe Nenna, Fulvia Villani, Carla Minarini, Mario Petrosino, Alfredo Rubino, Mitchell Denti, Antonio Facchetti
ORGANIC ELECTRONICS
(2016)
Article
Nanoscience & Nanotechnology
F. Villani, C. Schiattarella, T. Polichetti, R. Di Capua, F. Loffredo, B. Alfano, M. L. Miglietta, E. Massera, L. Verdoliva, G. Di Francia
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2017)
Article
Optics
F. Loffredo, F. Villani, C. Cancro, G. Nenna, A. Borriello, R. Miscioscia, C. Minarini, F. Roca
Article
Multidisciplinary Sciences
Enrico Sowade, Eloi Ramon, Kalyan Yoti Mitra, Carme Martinez-Domingo, Marta Pedro, Jofre Pallares, Fausta Loffredo, Fulvia Villani, Henrique L. Gomes, Lluis Teres, Reinhard R. Baumann
SCIENTIFIC REPORTS
(2016)
Article
Crystallography
Riccardo Castagna, Massimo Rippa, Francesco Simoni, Fulvia Villani, Giuseppe Nenna, Lucia Petti
Article
Chemistry, Multidisciplinary
Andres Jenaro Lopez Garcia, Giuliano Sico, Maria Montanino, Viktor Defoor, Manojit Pusty, Xavier Mescot, Fausta Loffredo, Fulvia Villani, Giuseppe Nenna, Gustavo Ardila
Summary: Zinc oxide nanowires are promising for various devices, and printing techniques offer advantages such as low cost and high quality results. Gravure printing is an effective method for depositing ZnO seed layers on flexible substrates, enabling the fabrication of flexible piezoelectric transducers with ZnO nanowires.
Article
Chemistry, Multidisciplinary
Domenico Sagnelli, Marcella Calabrese, Olga Kaczmarczyk, Massimo Rippa, Ambra Vestri, Valentina Marchesano, Kristoffer Kortsen, Valentina Cuzzucoli Crucitti, Fulvia Villani, Fausta Loffredo, Carmela Borriello, Giuseppe Nenna, Mariacristina Cocca, Veronica Ambrogi, Katarzyna Matczyszyn, Francesco Simoni, Lucia Petti
Summary: The efficiency of photomobile polymers (PMP) in converting light into mechanical work is crucial for various novel applications. Azobenzene monomers have shown to be efficient for preparing photoresponsive PMPs. Integrating zinc oxide nanoparticles into a liquid crystalline polymer network improves optical properties.
Article
Materials Science, Multidisciplinary
Gianfranco Carotenuto, Angela Longo, Giuseppe Nenna, Ubaldo Coscia, Mariano Palomba
Summary: The study reveals that epoxy resins can effectively adhere to alkali metal halides, improving the detection of high-energy radiation. Technovit Epox, in particular, showed higher transparency and was functionalized with white powdered pigments to achieve an optically reflective coating on the scintillator surface.
Article
Materials Science, Multidisciplinary
Fausta Loffredo, Fulvia Villani, David Choy Buentello, Grissel Trujillo-de Santiago, Mario Moises Alvarez, Riccardo Miscioscia, Ernesto Di Maio
Summary: This research introduces a method of using inkjet printing technology and gas-foaming process to create patterned porosities on polymeric thin films. By printing poly (vinyl alcohol) on the thin film and subsequently conducting a gas-foaming process, a bubble pattern can be formed in the covered areas. The surface-morphology features of the patterned porous PLA films have been proven effective at driving endothelial cell growth.
Article
Plant Sciences
Luigi d'Aquino, Rosaria Cozzolino, Giovanni Nardone, Gianni Borelli, Emilia Gambale, Maria Sighicelli, Patrizia Menegoni, Giuseppe Carlo Modarelli, Juri Rimauro, Elena Chianese, Giuseppe Nenna, Tommaso Fasolino, Gilda D'Urso, Paola Montoro
Summary: The indoor cultivation of basil using artificial lighting is gaining interest. This study compared the effects of white and blue-red light on plant growth, photochemistry, nutrient concentration, and secondary metabolism. The plants grown under white light showed better growth and biomass production compared to those grown under blue-red light. Both light conditions had different effects on nutrient concentration and translocation rate, and no photosynthetic stress was observed. However, leaves grown under white light had higher levels of maximum quantum yield of PSII and electron transport rate. Differences in metabolic patterns, especially phenolic compound concentrations, were detected under the two lighting conditions.
Proceedings Paper
Materials Science, Composites
Loredana Tammaro, Tiziana Di Luccio, Carmela Borriello, Fausta Loffredo, Karthik Ramachandran, Fulvia Villani, Francesca Di Benedetto, Tara Schiller, Carla Minarini, Julia A. Kornfield
9TH INTERNATIONAL CONFERENCE ON TIMES OF POLYMERS AND COMPOSITES: FROM AEROSPACE TO NANOTECHNOLOGY
(2018)
Article
Engineering, Electrical & Electronic
Mariano Palomba, Angela Longo, Gianfranco Carotenuto, Ubaldo Coscia, Giuseppina Ambrosone, Giulia Rusciano, Giuseppe Nenna, Gianni Barucca, Luigi Longobardo
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2018)
Proceedings Paper
Engineering, Multidisciplinary
C. Schiattarella, T. Polichetti, F. Villani, F. Loffredo, B. Alfano, E. Massera, M. L. Miglietta, G. Di Francia
