Review
Chemistry, Physical
Jun-Kyul Song, Min Sung Kim, Seungwon Yoo, Ja Hoon Koo, Dae-Hyeong Kim
Summary: Efforts have been made to overcome the limitations of conventional rigid optoelectronic devices by using functional nanomaterials and organic materials for mechanical deformability. Advanced device designs and unconventional fabrication methods have contributed to the development of soft optoelectronic devices, leading to the creation of new devices. The focus is on developing deformable photodetectors and light-emitting diodes, with a discussion on system-level applications and future prospects.
Article
Chemistry, Physical
Lai-Peng Ma, Zhongbin Wu, Yukun Yan, Dingdong Zhang, Shichao Dong, Jinhong Du, Dongge Ma, Hui-Ming Cheng, Wencai Ren
Summary: This study successfully fabricates high-performance graphene FTEs for efficient flexible OLEDs by combining frustrated Lewis pair doping and nanostructure engineering. By depositing a p-type dopant on graphene electrode, both the light-extraction efficiency and charge injection efficiency are improved.
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)
Article
Chemistry, Physical
Pan Xiong, Yiqin Gong, Xiaoling Yang, Yihua Zhu, Cheng Chen, Jianhua Shen
Summary: This study demonstrates the growth of CsPbBr3 quantum dots in hydrophobic silica aerogels through an in-situ process. By utilizing the photoinitiated cross-linking reaction of conjugated linoleic acids, hydrophobic polymer shells were formed, which improved the water stability of quantum dots. The resulting composite showed remarkable optical performance and was successfully applied as a luminescent material in a white light-emitting diode.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Analytical
Hsin-Yi Wen, Yu-Shien Lu, Cheng-Yan Guo, Mei-Ying Chang, Wen-Yao Huang, Tung-Li Hsieh
Summary: The structure of the device used in this study is substrate/PMMA/ZnS/Ag/MoO3/NPB/Alq3/LiF/Al. The microstructure of the P4 substrate was found to enhance the device brightness. Analysis of AFM surface morphology, film resistance, and optical simulation results revealed that the microholes on the P4 substrate significantly contributed to the device performance. The reproducibility of the naturally formed holes was confirmed by fabricating devices with different emitting layer thicknesses.
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)
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
Nanoscience & Nanotechnology
Tao Zhou, Wenhao Zhang, Qingpeng Cao, Kaizhi Zhang, Xinxin Ban, Ming Pei, Jiayi Wang
Summary: Thermally activated delayed fluorescence (TADF) polymer has great potential for flexible solution-processed OLEDs. Two novel TADF polymers, P-Ph4CzCN and P-Ph5CzCN, with a small energy gap between the first excited singlet and triplet states were developed through solvent and in situ polymerization. The device performance testing showed high efficiencies in rigid devices, with maximum external quantum efficiencies (EQE(max)) of 11.9%, 14.1%, and 16.2% for blue, green, and white OLEDs, respectively. The solvent polymerization method allowed the fabrication of a flexible device on a PET substrate, making it the first reported flexible OLED based on a TADF polymer.
ACS APPLIED MATERIALS & INTERFACES
(2023)
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)
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)
Correction
Materials Science, Multidisciplinary
Zhikun Zhang, Lianlian Xia, Lizhao Liu, Yuwen Chen, Zuozhi Wang, Wei Wang, Dongge Ma, Zhaoping Liu
Summary: The article introduces a graphene-based hybrid anode for high-performance flexible organic light-emitting diodes, which is ultra-smooth and robust. This new type of graphene hybrid anode can improve the performance of flexible organic light-emitting diodes.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Multidisciplinary
Danyang Li, Junjie Wang, Jian Wang, Junbiao Peng
Summary: Perovskite materials can transition from green light to the full-visible light spectrum through halogen anion exchange. In this study, an in-situ solid-phase anion-exchange method combined with inkjet printing was employed to achieve full-color perovskite quantum dot light-emitting diodes (PeQD-LEDs). The dielectric constant of the anion-exchange medium solvent was found to affect the anion-exchange rate, and solvents with higher dielectric constant resulted in faster reaction rates and more defects. The chain length of amine salts in the anion-exchange medium solute also played a key role in the stability of electroluminescence spectra.
SCIENCE CHINA-CHEMISTRY
(2023)
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
Chemistry, Multidisciplinary
Subeesh Madayanad Suresh, Le Zhang, David Hall, Changfeng Si, Gaetano Ricci, Tomas Matulaitis, Alexandra M. Z. Slawin, Stuart Warriner, Yoann Olivier, Ifor D. W. Samuel, Eli Zysman-Colman
Summary: NOBNacene is a rare example of a p- and n-doped nonacene compound with linearly extended ladder-type multiresonant thermally activated delayed fluorescence (MR-TADF) emission. It exhibits efficient narrow deep blue emission with a PL wavelength of 410 nm, FWHM of 38 nm, PL quantum yield of 71%, and delayed lifetime of 1.18 ms. The OLED using NOBNacene as the emitter shows a comparable electroluminescence spectrum with a peak at 409 nm and a maximum external quantum efficiency (EQE(max)) of 8.5% at CIE coordinates of (0.173, 0.055). The EQE(max) is increased to 11.2% with 3 wt% doping of the emitter in the emissive layer, resulting in a slightly broadened electroluminescence spectrum with CIE coordinates of (0.176, 0.068).
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Katerina Skopalova, Itana Nusa Bubanja, Dragomir Stanisavljev, Nikola Cvjeticanin, Vera Kasparkova, Eliska Dad'ova, Erika Pavlikova, Marek Koutny, Marija Gizdavic-Nikolaidis, Petr Humpolicek
Summary: This study compares the biological properties of PANI prepared by different synthesis methods and oxidizing agents, which improves its potential applications in the biomedical field.
Article
Materials Science, Multidisciplinary
Hui-Ping Li, Cai-Yan Gao, Zhi-Ping Chen, Xin-Heng Fan, Lian-Ming Yang
Summary: In this study, a novel type of D-A non-fused-ring copolymers was designed and synthesized to overcome the trade-off relationship between electrical conductivity and Seebeck coefficient in organic semiconductors. The incorporation of fluorine atoms into the polymer backbone effectively increased the ordered degree of molecular stacking and improved both the electrical conductivity and Seebeck coefficient. The bimodal orientation of polymers played a crucial role in decoupling the correlation between electrical conductivity and Seebeck coefficient.
Article
Materials Science, Multidisciplinary
Mansour A. S. Salem, Amjad Mumtaz Khan, Hatem A. M. Saleh, Khalil M. A. Qasem, Mizna Ahmed, Aadil Shafi Bhat, Abdulaziz Abdullah Qasem Ali, Younes S. A. Ghanem, Ali Alrabie, Abdel-Basit Al-Odayni, Waseem Sharaf Saeed, Basheer Al-Anesi
Summary: This research focuses on the versatile substance, polyaniline/layered double hydroxide (PANI@Nd-Co/LDH), under solvothermal conditions. A thorough analysis of its structure and morphology was conducted using various analytical methods. The findings showed that PANI@Nd-Co/LDH exhibited highly sensitive and specific fluorescence detection of Pb(II) and Al(III), outperforming other heavy metal ions. The sensor demonstrated a turn-off fluorescence response for Pb(II) ions and a turn-on fluorescence response for Al(III) ions. The minimum detectable limits (MDL) were determined to be 9.6 nM for Pb(II) and 220 nM for Al(III). PANI@Nd-Co/LDH could be easily regenerated and reused for multiple cycles. The detection mechanisms involved the inner filter effect (IFE) for Pb(II) and the chelation-enhanced fluorescence (CHEF) effect for Al(III). These results highlight the excellent potential of PANI@Nd-Co/LDH in the detection and recognition of Pb(II) and Al(III) ions.
