Article
Nanoscience & Nanotechnology
Shihao Zhuang, Peter B. Meisenheimer, John Heron, Jia-Mian Hu
Summary: A metal/dielectric/magnetoelastic heterostructure is predicted to convert a femtosecond laser pulse into a narrow linewidth multicycle THz pulse through excitation and long-distance transport of THz spin waves in the magnetoelastic film. This approach reveals a method for optical generation of narrowband THz pulse and has implications for the design of THz magnonic devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Alberto Martin-Jimenez, Oscar Jover, Koen Lauwaet, Daniel Granados, Rodolfo Miranda, Roberto Otero
Summary: Controlling the interaction between the excitonic states and plasmonic modes is crucial for quantum information processing devices. In this study, the tunnel electroluminescence of insulated C60 nanocrystals in a nanocavity was switched from broad to narrow band emission by changing the bias voltage. The dominance of excitonic emission in the high-voltage region suggests new mechanisms for tunnel electroluminescence and offers possibilities for electrically tunable nanoscale light sources.
Article
Optics
Gong Chen, Xiaoguang Li
Summary: In this study, a strategy to externally tune the emission color of a quantum emitter by changing its electromagnetic environment was theoretically proposed. It was found that the photonic local density of states significantly affects the competition between internal radiative channels, enabling a selective electronic state to dominate the emission spectrum. This simple strategy has the potential to be useful in the future design of various nano-optical devices.
Article
Chemistry, Multidisciplinary
Pengcheng Jiang, Jingsheng Miao, Xiaosong Cao, Han Xia, Ke Pan, Tao Hua, Xialei Lv, Zhongyan Huang, Yang Zou, Chuluo Yang
Summary: This study introduces a highly emissive molecule with enhanced quenching resistance by segregating the planar MR-TADF skeleton using two bulky carbazolyl units, which significantly improves the performance of corresponding devices with a maximum external quantum efficiency of 40.0% and a full width at half maximum of 25 nm.
The steric effect of the bulky carbazolyl units largely removes the formation of detrimental excimers/aggregates, leading to an OLED example that can achieve narrow bandwidth and high EL efficiency surpassing 40% to date.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Rajendra Kumar Konidena, Minlang Yang, Takuma Yasuda
Summary: A simple and versatile molecular design for long-wavelength multi-resonance thermally activated delayed fluorescence emitters (>550 nm) is presented in this paper. By extending a fully fused polycyclic π-system with additional para-N-π-N conjugation, narrowband bright-yellow photoluminescence and electroluminescence emissions at approximately 560 nm can be achieved.
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Wenxu Yin, Xiaoyu Zhang, Xuyong Yang, Andrey L. Rogach, Weitao Zheng
Summary: This article summarizes the recent progress in the development of near-infrared quantum dot LEDs, focusing on how their device structure and emitter properties facilitate improvement of device performance. The challenges and opportunities associated with these LEDs are also discussed.
Article
Chemistry, Multidisciplinary
Qingteng Zhang, Gang Wan, Vitalii Starchenko, Guoxiang Hu, Eric M. Dufresne, Hua Zhou, Hyoungjeen Jeen, Irene Calvo Almazan, Yongqi Dong, Huajun Liu, Alec R. Sandy, George E. Sterbinsky, Ho Nyung Lee, P. Ganesh, Dillon D. Fong
Summary: The intermittent behavior of point defects in oxide heterostructures has been discovered using X-ray photon correlation spectroscopy. The local fluctuations between ordered phases in strained SrCoOx with different stability of oxygen vacancies are found to be modulated by the interaction energy between oxygen ions/vacancies and epitaxial strain. This study reveals the influence of defect dynamics on material functionality and opens new avenues for engineering the dynamical response of functional materials in neuromorphic and electrochemical applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Yongyu Cha, Shuai Li, Zuofang Feng, Rongjiao Zhu, Hongbing Fu, Zhenyi Yu
Summary: This article presents a multifunctional gain material with high optical gain and triplet utilization, serving as both a thermally activated delayed fluorescence emitter and a phosphorescence source.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Multidisciplinary Sciences
Hongli Guo, Xu Zhang, Gang Lu
Summary: Excitons in van der Waals heterostructures can be trapped by both moire and defect potentials, with their interplay modulating optoelectronic properties. The competition and cooperation of these two potentials can be controlled by vertical electric fields, offering the possibility to tune exciton localization. Additionally, defect engineering can further tailor the interplay of these potentials to create one-dimensional exciton lattices with tunable orientations, showing promise for on-demand optoelectronic responses.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Physics, Applied
Simran Arora, Subhabrata Dhar
Summary: The electroluminescence properties of n(+)-ZnO/p-GaN pn(+)-heterojunctions grown epitaxially have been investigated as a function of applied bias and temperature. The study reveals the presence of indirect interfacial excitons at lower temperatures. The electroluminescence feature associated with these excitons is redshifted with increasing forward bias. The formation of these excitons becomes unsustainable when the applied bias or temperature exceeds a threshold due to leakage and thermal escape of charges.
APPLIED PHYSICS LETTERS
(2023)
Article
Energy & Fuels
Vishal E. Puranik, Ravi Kumar, Rajesh Gupta
Summary: This article introduces the generalized quantitative electroluminescence (g-QUEL) method to evaluate the performance of defective and unevenly degraded photovoltaic (PV) modules. Experimental verification shows that the g-QUEL method is accurate and effective in assessing the output power of these modules.
PROGRESS IN PHOTOVOLTAICS
(2023)
Review
Chemistry, Inorganic & Nuclear
Jayaraman Jayabharathi, Venugopal Thanikachalam, Shanmugam Thilagavathy
Summary: This review presents a low-cost fabrication process for efficient phosphorescent organic light-emitting diodes (PhOLEDs) based on Ir(III) complexes. The excellent charge transportation and injection abilities of Ir (III) complexes contribute to their usage as both charge transport materials and emissive materials in PhOLEDs. The reduced intermolecular aggregation and excellent hole and electron transporting abilities of Ir(III) complexes lead to highly efficient PhOLEDs. In doped PhOLEDs, the efficiency is determined by exciton confinement, charge trapping, and dopant concentration.
COORDINATION CHEMISTRY REVIEWS
(2023)
Article
Materials Science, Multidisciplinary
Keh-Moh Lin, Horng-Horng Lin, You-Teh Lin
Summary: This study proposes a hierarchical inspection system to address the challenges of imbalanced data, recall rate, and inspection speed in the detection of defects in PV modules. By cropping EL images, the system increases the data sample size and designs lightweight CNN models to improve detection speed. Experimental results show high precision and recall rates of the system on the testing dataset.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Qinqin Ke, Yuyue Song, Ganggang Li, Baoxi Li, Yiwen Chen, Qing Wan, Dongge Ma, Zhiming Wang, Ben Zhong Tang
Summary: Hot-exciton emitters with high-lying reverse intersystem crossing (hRISC) exhibit improved exciton utilization efficiency and efficiency roll-off in organic light-emitting diodes (OLEDs). In this study, two similar emitters were designed to tune the T-2 state, and it was discovered that the T-2 levels were contributed by the T-1 levels of the corresponding substituent group. Among them, 2NpNMZ showed better efficiency due to its larger Delta E-T2T1 and smaller Delta E-T2S1.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Physical
Peter Udvarhelyi, Anton Pershin, Peter Deak, Adam Gali
Summary: This study demonstrates that the C-centre in silicon can be used as an optically readable quantum register in the L-band wavelength region. Through theoretical characterisation and experimental research, the properties of the C-centre are closely examined, and quantum optics protocols are established for controlling and reading the quantum states. These findings provide new possibilities for the development of silicon-based quantum technology.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Tatiana Latychevskaia, Colin Robert Woods, Yi Bo Wang, Matthew Holwill, Eric Prestat, Sara Mustafi, Sarah J. Haigh, Konstantin S. Novoselov
Summary: This study demonstrates the possibility of directly measuring scattering parameters through the intensity distribution of spots in CBED patterns. A method for recovering atomic scattering parameters from CBED patterns is proposed and validated through experiments and simulations.
Article
Chemistry, Multidisciplinary
Dmitry A. Mylnikov, Elena I. Titova, Mikhail A. Kashchenko, Ilya V. Safonov, Sergey S. Zhukov, Valentin A. Semkin, Kostya S. Novoselov, Denis A. Bandurin, Dmitry A. Svintsov
Summary: This study investigates the sub-terahertz photoconductivity of gapped bilayer graphene with electrically induced p-n junctions. The results show that these junctions have a strong positive contribution to resistance, temperature resistance coefficient, and photoresistivity at cryogenic temperatures.
Article
Optics
Jingxuan Wei, Yang Chen, Ying Li, Wei Li, Junsheng Xie, Chengkuo Lee, Kostya S. Novoselov, Cheng-Wei Qiu
Summary: This study presents a novel approach for circularly polarized light detection in the mid-infrared region, using geometric photodetectors and graphene ribbons. It offers a high-quality, filterless solution for on-chip CPL detection.
Article
Chemistry, Multidisciplinary
Elena Titova, Dmitry Mylnikov, Mikhail Kashchenko, Ilya Safonov, Sergey Zhukov, Kirill Dzhikirba, Kostya S. Novoselov, Denis A. Bandurin, Georgy Alymov, Dmitry Svintsov
Summary: Graphene's high carrier mobility, compatibility with on-chip waveguides and transistors, and small heat capacitance make it a promising material for the detection of terahertz (THz) radiation. However, the weak reaction of graphene's physical properties to the detected radiation is due to the absence of a band gap. This study investigates the effect of electrically induced band gap on THz detection in graphene bilayer with split-gate p-n junction, and demonstrates that the induction of a band gap leads to increased current and voltage responsivities.
Article
Materials Science, Multidisciplinary
Qin Qin, Weiqi Cao, DaWa Zhaxi, Xianyong Chen, Daria V. Andreeva, Kefan Chen, Shuai Yang, Hao Tian, Majid Shaker, Zhan Jin, Kostya S. Novoselov
Summary: In this study, composite phase change materials (PCMs) (EG-PCM and SA-PCM) with stable shape were prepared using 1-decanol, expanded graphite (EG), and silica aerogel (SA). The optimal contents of EG and SA in the composite PCMs were determined to be 9% and 14% respectively. The composite PCMs showed good thermal stability even after 220 heating/cooling cycles. The thermal conductivity of EG-PCM and SA-PCM was enhanced to 16.09 times and 1.21 times of the neat PCM, respectively. The composite PCMs effectively maintained the temperature and acidity of yogurt for several hours in a cold chain transport portable box.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Engineering, Chemical
Musen Chen, Maxim Trubyanov, Pengxiang Zhang, Qian Wang, Zelong Li, Kostya S. Novoselov, Daria Andreeva
Summary: Graphene oxide (GO) based multi-layered membranes have exceptional molecular-sieving properties for gas separation, especially for hydrogen decarbonization. However, the mechanism of gas permeation through two-dimensional GO membranes is very different from traditional polymeric membranes due to their multilayer, laminated nature. Understanding and measuring gas transport parameters, such as diffusivity and solubility, are crucial for the strategic design of novel membranes based on two-dimensional materials.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Georgy Ermolaev, Anatoly P. Pushkarev, Alexey Zhizhchenko, Aleksandr A. Kuchmizhak, Ivan Iorsh, Ivan Kruglov, Arslan Mazitov, Arthur Ishteev, Kamilla Konstantinova, Danila Saranin, Aleksandr Slavich, Dusan Stosic, Elena S. Zhukova, Gleb Tselikov, Aldo Di Carlo, Aleksey Arsenin, Kostya S. Novoselov, Sergey Makarov, Valentyn S. Volkov
Summary: In recent years, the significance of giant optical anisotropy in light manipulation has been demonstrated. However, achieving continuous tunability of optical anisotropy has remained a challenge. This study presents a solution to this problem through the chemical alteration of halogen atoms in single-crystal halide perovskites, resulting in the continuous modification of optical anisotropy. Our findings also show that halide perovskites can exhibit high optical anisotropy up to 0.6 in the visible range, the highest value among non-van der Waals materials.
Article
Multidisciplinary Sciences
Na Xin, James Lourembam, Piranavan Kumaravadivel, A. E. Kazantsev, Zefei Wu, Ciaran Mullan, Julien Barrier, Alexandra A. Geim, I. V. Grigorieva, A. Mishchenko, A. Principi, V. I. Fal'ko, L. A. Ponomarenko, A. K. Geim, Alexey I. Berdyugin
Summary: The most distinctive feature of graphene is its electronic spectrum, in which the Dirac point is located. At low temperatures, the intrinsic behavior of this spectrum is often hidden by charge inhomogeneity, but thermal excitations can overcome the disorder at higher temperatures and create an electron-hole plasma. The behavior of this plasma in magnetic fields is not well understood at present.
Article
Multidisciplinary Sciences
C. Y. Hu, A. Achari, P. Rowe, H. Xiao, S. Suran, Z. Li, K. Huang, C. Chi, C. T. Cherian, V. Sreepal, P. D. Bentley, A. Pratt, N. Zhang, K. S. Novoselov, A. Michaelides, R. R. Nair
Summary: Intelligent transport of molecular species is crucial for biological functions, and is achieved through biological membranes. A phase-changing MoS2 membrane with memory effects and stimuli-regulated transport of molecules has been demonstrated in response to external pH. This phenomenon, unique to the 1T' phase of MoS2, has potential applications in autonomous wound infection monitoring and pH-dependent nanofiltration.
Article
Nanoscience & Nanotechnology
Tao Sun, Zhiyuan Tang, Wenjie Zang, Zejun Li, Jing Li, Zhihao Li, Liang Cao, Jan Sebastian Dominic Rodriguez, Carl Osby M. Mariano, Haomin Xu, Pin Lyu, Xiao Hai, Huihui Lin, Xiaoyu Sheng, Jiwei Shi, Yi Zheng, Ying-Rui Lu, Qian He, Jingsheng Chen, Kostya S. Novoselov, Cheng-Hao Chuang, Shibo Xi, Xin Luo, Jiong Lu
Summary: Heterogeneous single-atom spin catalysts combined with magnetic fields have been designed for accelerated chemical reactions. A hydrothermal approach was used to synthesize single-atom spin catalysts with various substitutional magnetic atoms in a MoS2 host. The Ni-1/MoS2 catalyst with a distorted tetragonal structure showed global room-temperature ferromagnetism, and the addition of a mild magnetic field significantly enhanced the oxygen evolution reaction magnetocurrent, leading to excellent activity and stability in water splitting cells.
NATURE NANOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
Rongguo Song, Boyang Mao, Zhe Wang, Yueyue Hui, Ning Zhang, Ran Fang, Jingwei Zhang, Yuen Wu, Qi Ge, Kostya S. Novoselov, Daping He
Summary: A graphene-assembled film (GAF) is introduced as a potential alternative to metal-based conducting materials in wireless communication and EMI shielding devices. GAF exhibits strong anticorrosive behavior and outperforms copper in terms of antenna bandwidth, EMI shielding effectiveness, and frequency selectivity.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Multidisciplinary Sciences
Krisztina Regos, Remy Pawlak, Xing Wang, Ernst Meyer, Silvio Decurtins, Gabor Domokos, Kostya S. Novoselov, Shi-Xia Liu, Ulrich Aschauer
Summary: Molecular self-assembly plays a crucial role in technology and biological systems. Predicting pattern formation in 2D molecular networks is challenging, but this study introduces a simplified hierarchical geometric model based on graph theory to predict extended network patterns. The model provides pattern classification and prediction within specific ranges, offering a different perspective on self-assembled molecular patterns and potential applications.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Engineering, Manufacturing
Yihe Huang, Yize Li, Kewen Pan, Yixian Fang, Kai Chio Chan, Xiaoyu Xiao, Chao Wei, Kostya S. Novoselov, John Gallop, Ling Hao, Zhu Liu, Zhirun Hu, Lin Li
Summary: We report a new laser-based method for producing ultrawideband metamaterial-based microwave absorbers with uniform sheet resistance and negative magnetic permeability, resulting in a wide bandwidth. The absorbers show high microwave absorption coefficient within a certain frequency range, and can be used in aviation, EMI suppression, and 5G applications.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Musen Chen, Qian Wang, Maxim Trubyanov, Kou Yang, Aleksandr S. Aglikov, Ge Qi, Ekaterina V. Skorb, Kostya S. Novoselov, Daria V. Andreeva
Summary: This study demonstrates the feasibility of large-scale self-assembly of graphene oxide flakes into anisotropic films using a simple blade coating technique. They also propose a statistical analysis method utilizing scanning electron microscopy images for the characterization of materials with macroscopic surface morphology. Furthermore, the application of these films as low-dimensional soft actuators is explored, showcasing their outstanding stimuli-responsive performance and self-adaptation to the environment.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
D. V. Grudinin, G. A. Ermolaev, D. G. Baranov, A. N. Toksumakov, K. V. Voronin, A. S. Slavich, A. A. Vyshnevyy, A. B. Mazitov, I. A. Kruglov, D. A. Ghazaryan, A. V. Arsenin, K. S. Novoselov, V. S. Volkov
Summary: There is a global trend towards miniaturization and multiwavelength performance of nanophotonic devices. Hexagonal boron nitride (hBN) is a promising material for future nanophotonics due to its inherent anisotropy and prospects of high-quality monocrystal growth with an atomically flat surface.
MATERIALS HORIZONS
(2023)
