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Ultrahigh-radiance near-infrared organic light-emitting diodes

Nature Photonics 2025年第6期19卷 650-657页

作者： Liu, Wansheng Deng, Wanyuan Wang, Weiping Wu, Haimei Gao, Chao Xie, Yuan Zhao, Jichen Dong, Xiaobin Zhao, Zujin Zheng, Zhong Chi, Yun Duan, Lian Zhan, Xiaowei Zou, Yingping Wu, Hongbin Peng, Junbiao Cao, Yong Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of Technology Guangzhou China Xi’an Key Laboratory of Liquid Crystal and Organic Photovoltaic Materials State Key Laboratory of Fluorine & Nitrogen Chemicals Xi’an Modern Chemistry Research Institute Xi’an China City University of Hong Kong Kowloon China Key Lab of Organic Optoelectronics and Molecular Engineering of Ministry of Education Department of Chemistry Tsinghua University Beijing China State Key Laboratory of Advanced Waterproof Materials School of Materials Science and Engineering Peking University Beijing China College of Chemistry and Chemical Engineering Central South University Changsha China School of Physics and Optoelectronics South China University of Technology Guangzhou China

Near-infrared organic light-emitting diodes are attractive for a broad range of applications, including night-time surveillance and biomedical diagnostic and imaging systems. However, obtaining high device radiance, which is necessary for many applications, and maintaining high operational stability is challenging due to the rapid efficiency roll-off at a high current density. Here we develop near-infrared organic light-emitting diodes based on an acceptor–donor–acceptor organic semiconductor with greatly suppressed singlet–triplet annihilation rate and triplet lifetime, alleviating singlet quenching by long-lived triplets, thereby enabling an ultrahigh singlet density at high electrical excitation levels. Our devices exhibit J50 values of 59.2 A cm−2, that is, the current density at which the external quantum efficiency decreases to half its peak value of 1.34%. A high external quantum efficiency is also maintained over a six orders of magnitude range of current densities, at values above 5,000 A cm−2. The devices emit with the maximum radiance beyond 2,000 W sr−1 m−2 under a continuous electrical bias and 46,700 W sr−1 m−2 in the pulsed electrical operation. The half-lifetime is 35 h for an initial radiance of 100 W sr−1 m−2. We also achieve a high electrically injected singlet density of more than 1016cm−3 at 1,000 A cm−2, which can sustain population inversion, indicating potential for organic lasers. These results pave the way for further developments of near-infrared organic light-emitting diodes as well as offer a potential route towards electrically driven organic laser diodes. © The Author(s), under exclusive licence to Springer Nature Limited 2025.

关键词： Organic light emitting diodes (OLED)

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Unavoidable multilevel biaxial symmetry breaking in chiral hybrid liquid crystals

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Physical Review E 2025年第4期111卷 045410-045410页

作者： Jin-Sheng Wu Marina Torres Lázaro Souvik Ghosh Haridas Mundoor Henricus H. Wensink Ivan I. Smalyukh Department of Physics and Chemical Physics Program University of Colorado Boulder Colorado 80309 USA Laboratoire de Physique des Solides–UMR 8502 Université Paris-Saclay and CNRS 91405 Orsay France International Institute for Sustainability with Knotted Chiral Meta Matter Hiroshima University Higashihiroshima Japan Department of Electrical Computer and Energy Engineering Materials Science and Engineering Program and Soft Materials Research Center University of Colorado Boulder Colorado 80309 USA Renewable and Sustainable Energy Institute National Renewable Energy Laboratory and University of Colorado Boulder Colorado 80309 USA

Chiral nematic or cholesteric liquid crystals (LCs) are fluid mesophases with long-ranged orientational order featuring a quasilayered periodicity imparted by a helical director configuration but lacking long-range positional order. Doping molecular cholesteric LCs with strongly anisotropic uniaxial colloidal particles adds another level of complexity because of the interplay between weak surface-anchoring boundary conditions and bulk-based elastic distortions near the particle-LC interface. Using cylindrical colloidal disks and rods with different geometric shapes and surface conditions, we demonstrate that these colloidal inclusions generically exhibit biaxial orientational probability distributions which may impart anomalously strong local biaxiality onto the hybrid cholesteric LC structure. Unlike nonchiral hybrid molecular-colloidal LCs, where biaxial order emerges only at critical colloid volume fractions exceeding some uniaxial-biaxial transition value, the orientational probability of the colloidal inclusions immersed in chiral nematic hosts is unambiguously biaxial even at infinite dilution. We demonstrate that the colloids induce local biaxial perturbations within the molecular orientational order of the LC host medium which strongly enhances the weak but native biaxial order of chiral nematic LC induced by the chiral symmetry breaking of the director field. With the help of analytical modeling and computer simulations based on the Landau–de Gennes free energy of the host LC around the colloids, we rationalize the observed multilevel biaxial order and conclude that it is not only unavoidable but also strongly enhanced compared to both achiral hybrid LCs and purely molecular cholesteric LCs.

关键词： Cholesteric liquid crystals

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Traces of Potassium Induce Restructuring of the Anatase TiO₂(001)-(1×4) Surface from a Reactive to an Inert Structure

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Journal of Physical Chemistry Letters 2023年第40期14卷 8916-8921页

作者： Fu, Cong Li, Fei Wu, Zongfang Xiong, Feng Zhu, Junfa Gong, Xue-Qing Huang, Weixin Key Laboratory of Precision and Intelligent Chemistry iChEM Key Laboratory of Surface and Interface Chemistry and Energy Catalysis of Anhui Higher Education Institutes Department of Chemical Physics University of Science and Technology of China Hefei 230026 China Key Laboratory for Advanced Materials Centre for Computational Chemistry and Research Institute of Industrial Catalysis School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 China Hefei National Research Center for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230026 China

Reconstruction of solid surfaces is generally accompanied by changes in surface activities. Here, via a combined experimental and theoretical study, we successfully identified that a trace amount of potassium dopant restructures the mineral anatase TiO₂(001) single-crystal surface from an added molecule (ADM) termination to an added oxygen (AOM) one without changing the (1×4) periodicity. The anatase TiO₂(001)-(1×4)-ADM surface terminated with 4-fold coordinated Ti_4c and 2-fold coordinated O_2c sites is (photo)catalytically active, whereas the anatase TiO₂(001)-(1×4)-AOM surface terminated with O_2c and inaccessible 5-fold coordinated Ti_5c sites is inert. These results unveiled a mechanism of dopant-induced transformation from a reactive to an inert TiO₂(001)-(1×4) surface, which unifies the existing arguments about the surface structures and (photo)catalytic activity of anatase TiO₂(001)-(1×4). © 2023 American chemical Society.

关键词： Adsorption Minerals Oxides Potassium Surface structures

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Recent Advances in Carbon-Based Current Col lectors/Hosts for Alkali Metal Anodes

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Energy & Environmental materials 2023年第5期6卷 112-141页

作者： Guanyao Wang Chan Song Jiaqi Huang Ho Seok Park School of Chemical Engineering Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Korea School of Chemistry and Molecular Engineering Nanjing Tech UniversityNanjing 211816China School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081China Department of Health Sciences and Technology Samsung Advanced Institute for Health Sciences and Technology(SAIHST)Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University2066SeoburoJangan-guSuwon 440-746Korea

The urgent demand for high-energy-density storage systems evokes the research upsurge on the alkali metal batteries with high theoretical ***,the utilization of alkali metal anodes,including Li,Na,and K,is significantly hindered by notorious dendrite growth,undesirable corrosion,and unstable solid electrolyte *** order to resolve these issues,the carbon materials for the rational design of current collector/host that can regulate the plating/stripping behavior of alkali metal have been *** carbon-based current collectors/hosts are featured with many pivotal advantages,including mechanical integrity to accommodate the volume change,superior electronic/ionic conductivity,large available surface area,and rich functionalization chemistries to increase the affinity to alkali *** this review,the recent progress on various dimensional carbon-based current collectors/hosts with different chemical components in stabilizing the alkali metal anodes through the regulation of initial deposition and subsequent growth behavior during plating/stripping process is *** nanostructured carbon scaffolds with self-affinity to alkali metals,as well as the carbon frameworks with internal/external affinitive sites to alkali metals,catalogued by various dimensions,are discussed in this ***,these appealing strategies based on the carbon-based current collectors/hosts can provide a paradigm for the realization of high-energy-density alkali metal batteries.

关键词： carbon-based materials current collectors energy density hosts metal anodes

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Machine-learned molecular surface and its application to implicit solvent simulations

arXiv

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arXiv 2021年

作者： Wei, Haixin Zhao, Zekai Luo, Ray Departments of Materials Science and Engineering Molecular Biology and Biochemistry Chemical and Biomolecular Engineering and Biomedical Engineering Graduate Program in Chemical and Materials Physics University of California IrvineCA92697 United States

Implicit solvent models, such as Poisson-Boltzmann models, play important roles in computational studies of biomolecules. A vital step in almost all implicit solvent models is to determine the solvent-solute interface, and the solvent excluded surface (SES) is the most widely used interface definition in these models. However, classical algorithms used for computing SES are geometry-based, thus neither suitable for parallel implementations nor convenient for obtaining surface derivatives. To address the limitations, we explored a machine learning strategy to obtain a level-set formulation for the SES. The training process was conducted in three steps, eventually leading to a model with over 95% agreement with the classical SES. Visualization of tested molecular surfaces shows that the machine-learned SES overlaps with the classical SES on almost all situations. We also implemented the machine-learned SES into the Amber/PBSA program to study its performance on reaction field energy calculation. The analysis shows that the two sets of reaction field energies are highly consistent with 1% deviation on average. Given its level-set formulation, we expect the machine-learned SES to be applied in molecular simulations that require either surface derivatives or high efficiency on parallel computing platforms. © 2021, CC BY.

关键词： Solvents

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Incorporating nanoparticles in 3D printed scaffolds for bone cancer therapy

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Bioprinting 2023年 36卷

作者： Al Sawaftah, Nour M. Pitt, William G. Husseini, Ghaleb A. Materials Science and Engineering Program College of Arts and Sciences American University of Sharjah Sharjah PO Box: 26666 United Arab Emirates Chemical Engineering Department Brigham Young University Provo UT United States Chemical and Biological Engineering Department College of Engineering American University of Sharjah Sharjah PO Box: 26666 United Arab Emirates

The low occurrence rate of bone cancer contributes to delayed diagnosis and treatment;in addition, the surgical resection of bone tumors can cause significant bone defects, further hindering the effective treatment of the disease. 3D printing can help overcome some of these limitations by enabling the design and fabrication of innovative scaffolds loaded with chemotherapeutics and growth factors, stimulating bone regeneration, and delivering targeted cancer treatment. Moreover, advancements in nanotechnology have opened up new possibilities for bone tissue engineering. Nanoparticles (NPs) possess size-dependent physicochemical properties. NPs can also be designed to respond to specific stimuli enhancing localized drug delivery. These unique properties can be harnessed by embedding NPs in 3D-printed scaffolds to develop multifunctional bone scaffolds with enhanced mechanical properties and drug delivery capabilities. This review evaluates the impact of incorporating NPs in 3D-printed scaffolds on bone cancer therapy and bone regeneration. First, various 3D printing techniques employed in the biomedical field are presented and explained. The article then highlights notable achievements by researchers in this area. Finally, the review discusses the current obstacles facing this technology and how they can be addressed to enable translation into clinics. © 2023 The Authors

关键词： 3D printing Bone cancer Cancer therapy Nanoparticles Stimulus

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Tuning the composition of highly stable mixed-metal MOFs by microwave-assisted hydrothermal method for ultra-high selective and simultaneous capture of CO2 and H2S

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chemical engineering Journal 2024年 497卷

作者： Nguyen, Manh B. Nguyen, Linh Ho Thuy Lai, Hoa Thi Doan, Huan V. Tran, Ngoc Quang Mai, Ngoc Xuan Dat Tran, Lam Dai Krisbiantoro, Philip Anggo Wu, Kevin C.-W. Doan, Tan Le Hoang Institute of Chemistry Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Street Cau Giay Ha Noi Viet Nam Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Street Cau Giay Hanoi Viet Nam Vietnam National University-Ho Chi Minh City Ho Chi Minh City Viet Nam University of Health Science Ho Chi Minh City Viet Nam Center for Innovative Materials and Architectures Ho Chi Minh City Viet Nam Research School of Chemistry The Australian National University CanberraAT2601 Australia Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Cau Giay Hanoi Viet Nam Molecular Science and Technology Program Taiwan International Graduate Program Academia Sinica Taipei11529 Taiwan International Graduate Program of Molecular Science and Technology National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Taoyuan Chung-Li Taiwan

In the present study, water-stable bimetallic M−Cu−BTC−II (M=Mg, Fe, Ni, Co, Zn, Mn, and Zr;II=isopropanol and imidazole) was synthesized via the microwave-assisted hydrothermal method without the use of any hazardous organic solvents, and the material was used as an adsorbent for CO2 and H2S gases under ambient conditions, i.e., 25 °C and 1 atm. While all adsorbents possessed the capability to adsorb both CO2 and H2S gases under ambient conditions, Ni-Cu-BTC-II was the best adsorbent in terms of adsorption capacity, i.e., 5.91 and 5.84 mmol g−1 for CO2 and H2S, respectively, which is higher than that of most of the previously reported materials, and stable for at least 10 cycles for CO2 adsorption. The high adsorption capacity of Ni-Cu-BTC-II is primarily attributed to the high specific surface area (1877 m2 g−1), large pore volume (0.607 cm3 g−1), appropriate sizes of the tetrahedral (5.1 Å) and square channel (9.0 Å) cages among M−Cu−BTC−II. The mechanistic study revealed that the process of absorbing CO2 and H2S gases begins with electrostatic interactions, which play an important role in the absorption of CO2 and H2S. For the H2S adsorption process, in addition to electrostatic interactions, the chemical bonding between M ions (Cu2+ and Ni2+) and S atoms in H2S also significantly contributes to the absorption capacity of H2S. © 2024 Elsevier B.V.

关键词： Carbon dioxide

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Performance Enhancement of Electrochemiluminescence with the Immunosensor Controlled Using Magnetized Masks for the Determination of Epithelial Cancer Biomarker EpCAM

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Analytical Chemistry 2023年第2期95卷 986-993页

作者： Huang, Chun-Yao Lin, Feng-Yen Chang, Chi-Jung Lu, Chien-Hsing Chen, Jem-Kun Taipei Heart Institute Taipei Medical University 250 Wu-Hsing Street Taipei110 Taiwan Division of Cardiology and Cardiovascular Research Center Taipei Medical University Hospital 252 Wu-Hsing Street Taipei110 Taiwan Department of Internal Medicine School of Medicine College of Medicine Taipei Medical University 250 Wu-Hsing Street Taipei110 Taiwan Department of Biomedical Sciences and Engineering National Central University 300 Zhongda Road Taoyuan City320317 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology 43 Sec. 4 Keelung Road Taipei106 Taiwan Department of Chemical Engineering Feng Chia University 100 Wenhwa Road Taichung40724 Taiwan Department of Obstetrics and Gynecology Taichung Veterans General Hospital 1650 Taiwan Boulevard Sect. 4 Taichung40705 Taiwan Institute of Biomedical Sciences Ph.D. Program in Translational Medicine Rong-Hsing Research Center for Translational Medicine National Chung-Hsing University Taichung940227 Taiwan

The performance of an electrochemiluminescence (ECL) immunosensor was improved with a particle gradient. SiO2-coated magnetic beads were adopted as nanocarriers for gradient manipulation and immobilized with the primary antibody. Cadmium telluride quantum dots were coated with a layer of protein G for conjugation and orientation of the secondary antibody as signal labels. ECL immunosensor gradients on the electrode were formed by magnetolithography (ML) with magnetized nickel masks of column and stripe arrays. The immunosensor generally aggregated as an island on the substrate, leading to a decrease of efficiency in the characteristic signals. Stripe arrays of magnetized nickel were designed to generate cylindrical magnetic flux on the substrate to improve the particle manipulation with the gradient. Various gradients of the sandwich-structured immunosensor substantially affected the electrochemical performance. Compared to the gradient-free immunosensor, the gradient of the immunosensor generated by ML using a 3 μm stripe array mask enhanced the ECL intensity ∼2.2 times. The results of quantification of epithelial cell adhesion molecules (EpCAM) with the gradient immunosensor showed a broad linear range (15-420 pg mL-1), a low limit of detection (5.5 pg mL-1), and high reliability for EpCAM-spiked serum samples, indicating that the immunosensor gradient substantially enhances the performance of the ECL assay. © 2022 American chemical Society.

关键词： Immunosensors

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Recent advance in synthesis and application of heteroatom zeolites

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Chinese chemical Letters 2021年第1期32卷 328-338页

作者： Tingting Pang Xuanyu Yang Chenyi Yuan Ahmed A.Elzatahry Abdulaziz Alghamdi Xing He Xiaowei Cheng Yonghui Deng School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200433China Materials Science and Technology Program College of Arts and SciencesQatar UniversityP.O.Box 2713DohaQatar Department of Chemistry College of ScienceKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China

Incorporation of heteroatoms into the framewo rk of zeolites has become a significant strategy to improve their performance in catalysis and adsorption,because the obtained heteroatom zeolites exhibit quite different properties from the conventional aluminosilicate zeolites in aspects of surface acidity,pore structures,particle size and so *** this review,the progress on the heteroatom zeolites including their synthesis and application is ***,the recent advance on the design and synthesis of different heteroatom zeolites is *** emphasis is placed on the introduction and comparison of three typical methods,including the direct synthesis,post synthesis and improved direct synthesis,for the traditional heteroatom zeolites(such as TS-1,Sn-MFI,Sn-β) and newly-reported heteroatom zeolites(such as W-MFI,Mo-MFI).According to their intrinsic characteristics,the application of heteroatom zeolites in diverse fields,such as production of fine chemicals,air pollution control and biomass conversion is then ***,the challenges and perspective on the future development of heteroatom zeolites in low-cost preparation and practical application are proposed.

关键词： Heteroatom zeolite Incorporation Tetrahedral coordination Research status Synthesis Application Prospective

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Optoelectronic properties of nanotubes based on tungsten disulfide

Optoelectronic properties of nanotubes based on tungsten dis...

引用

2022 IEEE Photonics Society Summer Topicals Meeting Series, SUM 2022

作者： Paukov, Maksim I. Goldt, Anastasia E. Komandin, Gennady A. Syuy, Alexander V. Yakubovskiy, Dmitriy I. Polyakov, Alexander Y. Tenne, Reshef Zak, Alla Novikov, Sergey Nasibulin, Albert G. Arsenin, Alexey V. Volkov, Valentin Burdanova, Maria G. Center for Photonics and 2D Materials Moscow Institute of Physics and Technology Dolgoprudny Russia Skolkovo Institute of Science and Technology Moscow Russia Prokhorov General Physics Institute Russian Academy of Science Moscow Russia Department of Physics Chalmers University of Technology Gothenburg Sweden Weizmann Institute of Science Department of Molecular Chemistry and Materials Science Rehovot Israel Faculty of Science Holon Institute of Technology Holon Israel School of Chemical Engineering Aalto University Espoo Finland Institute of Solid State Physics Russian Academy of Sciences Chernogolovka Russia

Inorganic nanotubes (NT), such as WS2NT, have unique properties making them promising candidates for op-toelectronic devices. Herein, we performed optical absorption, Raman, and time-domain terahertz spectroscopy of W... 详细信息

ISBN: (数字)9781665434898

ISBN: (纸本)9781665434898

关键词： Light absorption

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