Article
Optics
Guanhao Liu, Zhiyi Li, Xiaoxiao Hu, Yuanyuan Qin, Chun-Sing Lee, Dongqi Chen, Lingxue Wang, Jianjun Liu, Pengfei Wang, Yong-Jin Pu, Ying Wang
Summary: This study demonstrates highly efficient and stable OLEDs with thicknesses of over 1 mu m and low operating voltages. MoO3/SimCP2 is used as a hole-injection layer and a thick layer of TAPC is used as a hole-transporting layer. A thin layer of HAT-CN is incorporated to suppress electron leakage. The research paves the way for large-area OLED-based displays and lighting with high production yields.
Article
Chemistry, Analytical
Hyung-Joo Lee, In-Kyu Jang, Dae-Kwang Kim, Yu-Jung Cha, Sung Woon Cho
Summary: A titanium-indium tin oxide multilayer reflector was studied to enhance the light efficiency of high-power NIR-LEDs. The TITO/Ag reflector, fabricated by combining a patterned TITO and an omnidirectional reflector, exhibited the highest reflectance and enabled the production of NIR-LED chips with superior output performance.
Article
Materials Science, Multidisciplinary
Fan Xu, Xiaoyu Yang, Qixuan Zhong, Lei Zhao, Yongqiang Ji
Summary: By introducing SrBr2 as a dopant into the perovskite precursor solution, doped CsPbBr3 NCs with purer phases, suppressed defects, and hydrophobic surfaces are formed. These doped nanocrystals exhibit a high photoluminescence quantum yield and improved moisture stability. The doped CsPbBr3 light emitting diodes show significantly enhanced current efficiency and external quantum efficiency compared to the undoped counterparts.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Min-Ju Kim
Summary: This research focuses on the optimal thickness of indium tin oxide (ITO) as a transparent electrode for near-ultraviolet (NUV) light-emitting diodes (LEDs) based on InGaN/AlGaInN materials. The study investigates ITO thicknesses ranging from 30 to 170 nm and performs annealing processes to determine the best figure of merit (FOM) by balancing transmittance and sheet resistance in the NUV region. Among different thicknesses, an annealed ITO film measuring 110 nm demonstrates the highest FOM with notable characteristics such as 89.0% transmittance at 385 nm, a sheet resistance of 131 Ω/ and a contact resistance of 3.1 x 10(-3) Ω·cm(2). Comparing NUV LEDs using ITO films of various thicknesses, the NUV LED employing ITO with a thickness of 110 nm achieves a significant increase in light output power at 50 mA while maintaining the same forward voltage at 20 mA.
Article
Materials Science, Multidisciplinary
DongDong Wang, Yifan Zhang, MeiTing Luo, ShuYa Ning
Summary: In this study, three self-assembling materials were used as hole-injecting layers in organic light-emitting diodes (OLEDs), and their effects on the device performance were investigated. The results show that the type and tilting angle of the aromatic ring in the materials have an impact on the work function, hole injection, and device efficiency. Different materials exhibit different performance in different devices.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Hyung-Joo Lee, Gwang-Hoon Park, Jin-Su So, Jae-Hoon Kim, Hong-Gun Kim, Lee-Ku Kwac
Summary: In this study, a titanium-indium-tin oxide (TITO) film was successfully synthesized and showed superior transmittance and LED performance at lower temperatures by incorporating a 2-nm-thick titanium barrier at the bottom of an ITO film. Titanium atoms improved the crystallization of ITO, increased the optical bandgap, and resulted in higher light output power in LEDs fabricated with TITO films.
CURRENT APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Ji Ae Kang, Junseop Lim, Jun Yeob Lee
Summary: Spirobifluorene-based materials with electron transport units show improved performance as electron transport layers, reducing device driving voltage, enhancing quantum efficiency, and increasing the lifetime of green phosphorescent organic light-emitting diodes.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Nanoscience & Nanotechnology
Jose P. S. Cardoso, Maria Rosario Correia, Remy Vermeersch, Dirkjan Verheij, Gwenole Jacopin, Julien Pernot, Teresa Monteiro, Susana Cardoso, Katharina Lorenz, Bruno Daudin, Nabiha Ben Sedrine
Summary: Europium-implanted AlN nanowire pn junctions were annealed at 1000 degrees C and showed increased Eu3+ luminescence intensity with higher fluence, while the contribution from defect-related emissions decreased. This study demonstrates the potential of using Eu-implanted AlN NWs for developing red LEDs with improved luminescence properties.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Kihoon Kim, Zachary M. Sherman, Angela Cleri, Woo Je Chang, Jon-Paul Maria, Thomas M. Truskett, Delia J. Milliron
Summary: By continuously varying doping at two length scales, the atomic and nanocrystal scales, the frequency and bandwidth of the collective plasmon resonance in nanocrystal-based metasurfaces can be tuned, leading to the emergence of a broad infrared spectral region with near-zero permittivity. This multiscale doping strategy offers a powerful approach to designing metamaterials for optical applications.
Article
Chemistry, Multidisciplinary
Mengyu Chen, Xingtong Chen, Wenchen Ma, Xiaojuan Sun, Longjia Wu, Xiongfeng Lin, Yixing Yang, Rui Li, Dongyang Shen, Yu Chen, Song Chen
Summary: A solution to the problems caused by ZnO nanoparticles is reported, using tetramethylammonium hydroxide to stabilize SnO2 nanoparticles and induce charge injection. SnO2-based devices exhibit high electroluminescence efficiency and long operational lifetime, with superior shelf stability, enabling QLEDs with real stability.
Article
Engineering, Environmental
Chen Li, Zedong Lu, Xiuwei Ao, Wenjun Sun, Xia Huang
Summary: The study prepared GO-TiO2 photocatalytic ceramic membranes activated by UV-LED, achieving simultaneous separation and degradation for pharmaceuticals. The 300 nm UV-LED showed high removal efficiency with low energy consumption. Membrane filtration enhanced degradation efficiency and reduced energy consumption, while H2O2 addition further increased removal efficiency in PCMRs equipped with UV-LEDs.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Physics, Applied
Jing Huang, Yuan He, Hao Zhu, Qinjun Chen, Yanhua Xu, Lili Miao, Chujun Zhao
Summary: The study experimentally demonstrated nonreciprocal light propagation using axially asymmetric nonlinear absorption in titanium nitride (TiN) nanosheets and C-60 in the visible regime. By enhancing the nonlinear absorption of TiN nanosheets, a passive photonic diode fabricated with TiN-C-60 showed enhanced nonreciprocal transmission at the ENZ wavelength.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Wei Chen, Chuan Xu, Lingqing Kong, Xiang-Yang Liu, Xingye Zhang, Naibo Lin, Xinhua Ouyang
Summary: This study reports the use of silk fibroin (SF) as a flexible OLED substrate to improve device performance by enhancing light extraction efficiency (LEE). SF-based flexible OLED outperforms the reference device in terms of turn-on voltage, peak brightness, and LEE. The improved performance can be attributed to the low refractive index of SF, its lower surface roughness, and more matched energy levels compared to other substrates. Additionally, a molecular dipole layer formed between the interface of indium tin oxide (ITO) and SF effectively changes the ITO work function, reducing the potential barrier height for hole transfer.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Physical
Daniel Tan, Wonhee Lee, Ki Tae Park, Ye Eun Jeon, Jumi Hong, You Na Ko, Young Eun Kim
Summary: Electrochemical reduction of CO2 to various chemicals is a promising approach, but challenges such as high overpotential, poor stability, and low selectivity remain. Multi-component materials, like indium-doped tin oxide nanowires (In-SnO2 NWs), have been proposed to overcome these problems. The unique 1D structure and In-doping of SnO2 NWs enhance formate selectivity by up to 82% compared to bare SnO2 NWs at -1.04 V (vs RHE) by inducing electron delocalization and providing more active sites for stable adsorption of intermediates.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Yan Wang, Xinyao Shan, Yingjie Tang, Tianyu Liu, Binghan Li, Peng Jin, Kun Liang, Dingwei Li, Yang Michael Yang, Huaibin Shen, Bowen Zhu, Botao Ji
Summary: Developing advanced patterning techniques for colloidal nanocrystals is crucial for high-performance electronic/optoelectronic devices. The researchers have developed a direct method to pattern functional nanocrystals without the need for complicated photolithography processes or photosensitive molecules. The obtained patterns allow for postpatterning ligand exchange, enabling the fabrication of thin-film transistors and light-emitting diodes with enhanced performances.
ACS APPLIED NANO MATERIALS
(2022)
