Review
Materials Science, Multidisciplinary
Amjad Islam, Khurram Usman, Zeeshan Haider, Muhammad Fakhar Alam, Ali Nawaz, Prashant Sonar
Summary: Compared to their inorganic counterparts, organic optoelectronic devices receive attention due to their lower cost, mechanical flexibility, bandgap engineering, and solution processability. Biomass materials have emerged as effective candidates to modify the interfacial properties of organic solar cells, perovskite solar cells, and organic light-emitting diodes, leading to improved efficiency. The use of biomass interlayer materials is still in its early stages, but their nontoxicity, biorelevance, sustainability, proton conductivity, and functional groups have stimulated researchers globally to fabricate novel devices.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Meili Xu, Changbin Zhao, Zhimin Meng, Hao Yan, Hongming Chen, Zhixiang Jiang, Zhuonan Jiang, Hong Chen, Lingqiang Meng, Wei Hui, Zhenhuang Su, Yueyue Wang, Zhenhui Wang, Jianing Wang, Yuanhong Gao, Yaowu He, Hong Meng
Summary: In the field of AMOLED, the demand for higher integration density of driver chips has increased due to large-size and ultra-high-definition applications. Traditional technology of scaling down device dimension to improve integration density is facing challenges as Moore's Law approaches the limit. This article introduces a novel Fe-OLET device that integrates switching, light-emitting, and nonvolatile memory functions into a single device, achieving improved field-effect mobility and luminance.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Physical
Meagan Papac, Vladan Stevanovi, Andriy Zakutayev, Ryan O'Hayre
Summary: Triple ionic-electronic conductors (TIECs) have potential applications in various electrochemical devices, but further research is needed to fully understand their transport properties and electrocatalytic activity. Current studies focus on defect formation and conduction mechanisms in single-phase materials. By exploring criteria for discovery, design principles, and operating conditions, it is possible to intentionally adjust the conductivity of each charge carrier.
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
Polymer Science
Ronit Sebastine Bernard, Viktorija Andruleviciene, George K. Belousov, Aliaksei A. Vaitusionak, Uliana Tsiko, Dmytro Volyniuk, Sergei Kostjuk, Rimantas Henrikas Kublickas, Juozas Vidas Grazulevicius
Summary: New electroactive vinyl monomers were prepared and polymerized using RAFT technique to obtain polymers with controlled molecular weight and low polydispersity. These polymers demonstrated excellent delayed fluorescence properties and high external quantum efficiency in OLED devices.
EUROPEAN POLYMER JOURNAL
(2022)
Article
Physics, Applied
Xiangtian Xiao, Taikang Ye, Jiayun Sun, Xiangwei Qu, Zhenwei Ren, Dan Wu, Shihao Ding, Xiao Wei Sun, Wallace C. H. Choy, Kai Wang
Summary: A capacitance-voltage (C-V) model is established to describe carrier behaviors in perovskite light-emitting diodes (PeLEDs) and is used to guide the improvement of electroluminescence (EL) performance. High hole injection barrier and insufficient recombination are revealed and addressed by the design of a MoO3 interface layer, leading to an improved external quantum efficiency in the optimized PeLED.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Hwa Seung Kang, Dae Hun Kim, Tae Whan Kim
Summary: This study reports on the enhanced conductivity of benzoic-acid-treated PEDOT:PSS electrode for OLEDs, which significantly reduces operating voltage and increases brightness of the system. Additionally, the treatment method also improves the mechanical stability of OLEDs after numerous bending cycles.
SCIENTIFIC REPORTS
(2021)
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, 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
Polymer Science
Ruslana Udovytska, Pavel Chulkin, Aleksandra Wypych-Puszkarz, Jaroslaw Jung
Summary: The article explores three different degradation mechanisms of polymer light-emitting diodes (PLEDs) caused by damage to the protective layer. By comparing PLEDs with different encapsulation methods, the study investigates the impact of protective layer damage on electroluminescence and charge transport properties. Impedance spectroscopy is used to analyze the degradation mechanism related to charge transport.
Article
Physics, Applied
Hajime Okumoto, Tetsuo Tsutsui
Summary: The study demonstrates that self-heating of devices is a source of negative capacitance in organic light-emitting diodes and hole-only devices. The principal mechanism of negative capacitance is the nonlinear coupling of the real and imaginary parts of admittance caused by AC temperature modulation. External heating induced negative capacitance, reflecting the heat transfer characteristics of the devices.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Anna S. Miroshnichenko, Konstantin Deriabin, Artem Baranov, Vladimir Neplokh, Dmitry M. Mitin, Ilya E. Kolesnikov, Mikhail Dobrynin, Elizaveta K. Parshina, Ivan S. Mukhin, Regina M. Islamova
Summary: Light-excited flexible and self-healing luminescent polymers have been widely studied for the development of advanced color-emitting films. This study presents a two-step synthesis method to produce red, green, and blue-emitting polymers, which can be used for controlled color lighting in flexible devices. Additionally, these polymers demonstrate high tensile strength and elongation, as well as non-autonomous self-healing properties.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Physics, Applied
Xin Xu, Hoyeong Kwon, Stanley Finch, Jae Young Lee, Leland Nordin, Daniel Wasserman, Andrea Alu, Ananth Dodabalapur
Summary: Organic light emitting diodes have high internal quantum efficiency but low external quantum efficiency, which can be improved using gradient metasurfaces and metagratings. Reflecting plasmonic metagratings can greatly enhance light emissivity by effectively coupling out trapped light, leading to increased emission and suppression of light trapping. These enhancements are achieved through electromagnetic field intensity manipulation and improvement of device performance.
APPLIED PHYSICS LETTERS
(2021)
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
Eun-Jeong Bae, Hyeong-Kyu Maeng, Ji-Soo Shin, Dong-Wook Park, Young-Wook Park, Dong-Hyun Baek
Summary: A micro-sphere PDMS film is proposed to improve the external quantum efficiency (EQE) in OLEDs. The film is fabricated through a specific process and the size and distribution of the micro-spheres play essential roles in improving the performance. Additionally, the film, based on polymeric materials, offers advantages in cost control and large-scale production.