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Thermally activated delayed fluorescence materials for nondoped organic light-emitting diodes with nearly 100%exciton harvest

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SmartMat 2023年第1期4卷 129-139页

作者： Xiao-Chun Fan Kai Wang Yi-Zhong Shi Dian-Ming Sun Jia-Xiong Chen Feng Huang Hui Wang Jia Yu Chun-Sing Lee Xiao-Hong Zhang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesJoint International Research Laboratory of Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhouChina Research Center for Green Printing Nanophotonic Materials Jiangsu Key Laboratory for Environmental Functional MaterialsSchool of Materials Science and EngineeringSuzhouChina Organic Semiconductor Centre EaStCHEM School of ChemistryUniversity of St AndrewsSt AndrewsUK Center of Super-Diamond and Advanced Films(COSDAF)and Department of Chemistry City University of Hong KongHong KongChina

High-performance nondoped organic light-emitting diodes(OLEDs)are promising technologies for future commercial ***,we synthesized two new thermally activated delayed fluorescence(TADF)emitters that enable us,for the first time,to combine three effective approaches for enhancing the efficiency of nondoped ***,the two emitters are designed to have high steric hindrances such that their emitting cores will be suitably isolated from those of their neighbors to minimize concentration *** the other hand,each of the two emitters has two stable conformations in solid *** their neat films,molecules with the minority conformation behave effectively as dopants in the matrix composing of the majority *** hundred percent exciton harvesting is thus theoretically feasible in this unique architecture of“self-doped”neat ***,both emitters have relatively high aspect ratios in terms of their molecular *** leads to films with preferred molecular orientations enabling high populations of horizontal dipoles beneficial for optical *** these three factors,OLEDs with nondoped emitting layers of the respective emitters both achieve nearly 100%exciton utilization and deliver over 30%external quantum efficiencies and ultralow efficiency roll-off at high brightness,which have not been observed in reported nondoped OLEDs.

关键词： dual conformations horizontal orientation organic light-emitting diodes self-doping thermally activated delayed fluorescence

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Aliovalent Sm-doping enables BNT-based realxor ferroelectric ceramics with>90% energy efficiency

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Journal of Advanced Ceramics 2024年第12期13卷 2043-2050页

作者： Dong-Xu Li Wei Deng Zong-Yang Shen Zhipeng Li Xiaojun Zeng Xuhai Shi You Zhang Wenqin Luo Fusheng Song Chao-Feng Wu Jiangxi Key Laboratory of Advanced Ceramic Materials China National Light Industry Key Laboratory of Functional Ceramic MaterialsSchool of Materials Science and EngineeringJingdezhen Ceramic UniversityJingdezhen 333403China Research Center for Advanced Functional Ceramics Wuzhen LaboratoryJiaxing 314500China Ceramic Research Institute of Light Industry of China Jingdezhen 333000China Center of Advanced Ceramic Materials and Devices Yangtze Delta Region Institute of Tsinghua UniversityJiaxing 314006China

Dielectric capacitors,as physical powers,are critical components of advanced electronics and pulse power ***,achieving high energy efficiency without sacrificing recoverable energy density remains a challenge for most dielectric *** this work,the aliovalent Sm^(3+)doped Ba_(0.12)Na_(0.3)Bi_(0.3)Sr_(0.28)TiO_(3)(BNBST)relaxor ferroelectric at the A site was used to design a defect-induced phase/domain structure to improve polarization switching.A high energy efficiency of 91%,together with a recoverable energy density of 2.1 J/cm^(3),was achieved in Sm_(0.07)–BNBST ceramics at a low electric field of 114 kV/cm,exceeding those of other dielectric materials under the same electric *** addition,Sm_(0.07)–BNBST ceramics exhibit good energy storage stability and endurance and fast charging‒discharging speeds,demonstrating their great potential in electrostatic capacitor *** work provides an approach to achieve highperformance dielectrics through aliovalent rare earth doping and builds a close relationship between the defect-engineered phase/domain structure and polarization switching for energy storage.

关键词： energy storage ceramics relaxor ferroelectrics aliovalent doping (Bi_(05)Na_(0.5))TiO_(3)(BNT) pulse power

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Modulation of the octahedral structure and potential superconductivity of La_(3)Ni_(2)O_(7)through strain engineering

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Science China(Physics,Mechanics & Astronomy) 2025年第3期68卷 145-152页

作者： Zihao Huo Zhihui Luo Peng Zhang Aiqin Yang Zhengtao Liu Xiangru Tao Zihan Zhang Shumin Guo Qiwen Jiang Wenxuan Chen Dao-Xin Yao Defang Duan Tian Cui Key Laboratory of Material Simulation Methods&Software of Ministry of Education State Key Laboratory of Superhard MaterialsCollege of PhysicsJilin UniversityChangchun130012China Center for Neutron Science and Technology Guangdong Provincial Key Laboratory of Magnetoelectric Physics and DevicesState Key Laboratory of Optoelectronic Materials and TechnologiesSchool of PhysicsSun Yat-sen UniversityGuangzhou510275China MOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter Shaanxi Province Key Laboratory of Advanced Functional Materials and Mesoscopic PhysicsSchool of PhysicsXi’an Jiaotong UniversityXi’an710049China Institute of High Pressure Physics School of Physical Science and TechnologyNingbo UniversityNingbo315211China

The recent transport measurements of La_(3)Ni_(2)O_(7)uncovered a“right-triangle”shape of the superconducting dome in the pressure-temperature(P-T)phase *** by this,we perform theoretical first-principles studies of La_(3)Ni_(2)O_(7)with the pressure ranging from 0 to 100 ***,we reveal a pressure dependence of the Ni-d_(z^(2))electron density at the Fermi energy(n_(z)^(E_(F)))that highly coincides with such *** this basis,we further explore the electronic structure under uniaxial *** tracking the stress response of n_(z)^(E_(F)),we propose that superconductivity can be achieved by applying only ~2GPa of compression along the c *** idea is further exemplified from the perspectives of lattice distortion,band structure,Fermi surface and superconducting phase *** also discuss the possible charge modulation under the stress and provide an insight into the relation between nz E Fand the superconducting T_(c)in La_(3)Ni_(2)O_(7)*** study provides new routes to the search of high-T_(c)superconductors in future experiments.

关键词： nickelate superconductors density functional theory strong correlated systems strain engineering

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Dynamical signatures of the one-dimensional deconfined quantum critical point

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Chinese Physics B 2022年第5期31卷 73-82页

作者： Ning Xi Rong Yu Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices Renmin University of ChinaBeijing 100872China

We study the critical scaling and dynamical signatures of fractionalized excitations at two different deconfined quantum critical points(DQCPs)in an S=1/2 spin chain using the time evolution of infinite matrix product *** scaling of the correlation functions and the dispersion of the conserved current correlations explicitly show the emergence of enhanced continuous symmetries at these *** dynamical structure factors in several different channels reveal the development of deconfined fractionalized excitations at the ***,we find an effective spin-charge separation at the DQCP between the ferromagnetic(FM)and valence bond solid(VBS)phases,and identify two continua associated with different types of fractionalized excitations at the DQCP between the X-direction and Z-direction FM *** findings not only provide direct evidence for the DQCP in one dimension but also shed light on exploring the DQCP in higher dimensions.

关键词： one-dimensional antiferromagnetism spin frustration deconfined quantum critical point spin dynamics infinite time-evolving block decimation

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Carrier-Density-Determined Magnetoresistance in Semimetal SrIrO_(3)

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Chinese Physics Letters 2024年第10期41卷 90-96页

作者： Liang Yang Biao Wu Xin Liu Mingyu Wang Congli He Shouguo Wang Jinxing Zhang School of Physics and Astronomy Beijing Normal UniversityBeijing 100875China Key Laboratory of Multiscale Spin Physics(Ministry of Education) Beijing Normal UniversityBeijing 100875China SwissFEL Paul Scherrer InstituteVilligen PSI 5232Switzerland Anhui Key Laboratory of Magnetic Functional Materials and Devices School of Materials Science and EngineeringAnhui UniversityHefei 230601China

SrIrO_(3),a Dirac material with a strong spin-orbit coupling(SOC),is a platform for studying topological properties in strongly correlated systems,where its band structure can be modulated by multiple factors,such as crystal symmetry,elements doping,oxygen vacancies,magnetic field,and ***,we find that the engineered carrier density plays a critical role on the magnetoelectric transport properties of the topological semimetal SrIrO_(3).The decrease of carrier density subdues the weak localization and the associated negative magnetoresistance,while enhancing the SOC-induced weak ***,the sample with the lowest carrier density exhibits high-field positive magnetoresistance,suggesting the presence of a Dirac *** addition,the anisotropic magnetoresistance indicates the anisotropy of the electronic structure near the Fermi *** engineering of carrier density provides a general strategy to control the Fermi surface and electronic structure in topological materials.

关键词： temperature materials topological

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Semicrystalline Unfused Polymer Donors with Backbone Halogenation toward Cost-Effective Organic Solar Cells

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Chinese Journal of Chemistry 2024年第7期42卷 752-759页

作者： Yuxin Kong Shijie Ju Hongmei Qin Min Hun Jee Simeng Xia Jiaqi Ren Chao Gao Jianyu Yuan Wenyan Su Han Young Woo Yuxiang Li School of Materials Science and Engineering Xi'an University of Science and TechnologyXianShaanxi 710054China Department of Chemistry Korea UniversitySeoul 02841Republic of Korea Xi'an Key Laboratory of Liquid Crystal and Organic Photovoltaic Materials State Key Laboratory of Fluorine&Nitrogen ChemicalsXi'an Modern Chemistry Research InstituteXi'anShaanxi 710065China Jiangsu Key Laboratory for Carbon-Based Functional Materials&Devices Institute of Functional Nano&Soft Materials(FUNSOM)Soochow University199 Ren'ai RoadSuzhouJiangsu 215123China

Developing novel unfused building blocks with simple synthesis and low cost is essential to advance and enrich cost-effective poly-mer donors;however,it remains a challenge due to the lack of efficient molecular ***,a class of low-cost and fully unfused polymer donors with precisely regulated backbone planarity via halogenation was designed and synthesized,namely PDTBTBz-2H,PDTBTBz-2F,and *** polymer donors possess a four-step synthesis route with over 80%yield from cheap raw chemicals comparable to existing low-cost polymer donors,such as *** from the planar backbone via in-corporating the F…S non-covalent interactions,PDTBTBz-2F exhibits more robust J-type aggregation in solution and a long-ranged molecular stacking in film relative to PDTBTBz-2H and ***,the systematical study of PDTBTBz-based organic so-lar cells(OSCs)reveals the close relationship between optimized molecular self-assembly and charge separation/transport regarding backbone halogenation when paired with the non-fullerene acceptor(Y6-BO-4F).As a result,the photovoltaic devices based on semicrystalline PDTBTBz-2F achieved a promising power conversion efficiency(PCE)of 12.37%.Our work highlighted the influence of backbone halogenation on the molecular self-assembly properties and a potential unfused backbone motif for further developing cost-effective OSCs.

关键词： Low-cost Polymer donors Backbone halogenation Molecular self-assembly Organic solar cells

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4D-printed snake-like biomimetic soft robots

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Bio-Design and Manufacturing 2025年第1期8卷 55-67,I0018-I0038页

作者： Xingcheng Ou Jiaqi Huang Dantong Huang Xiaohong Li Guoliang Chen Yabin Yang Ran Bi Yu Sheng Shuang-Zhuang Guo Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices Guangdong Engineering Technology Research Centre for Functional BiomaterialsKey Laboratory for Polymeric Composite and Functional Materials of Ministry of EducationState Key Laboratory of Optoelectronic Materials and TechnologiesSchool of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275China

Wireless millirobots engineered to infiltrate intricate vascular networks within living organisms,particularly within constricted and confined spaces,hold immense promise for the future of medical ***,with their multifaceted and intricate designs,some robots often grapple with motion and functionality issues when confronted with tight spaces characterized by small cross-sectional *** this study,drawing inspiration from the high aspect ratio and undulating swimming patterns of snakes,a millimeter-scale,snake-like robot was designed and fabricated via a combination of extrusion-based four-dimensional(4D)printing and magnetic-responsive intelligent functional inks.A sophisticated motion control strategy was also developed,which enables the robots to perform various dynamic movements,such as undulating swimming,precise turns,graceful circular motions,and coordinated cluster movements,under diverse magnetic field *** a potential application,the snake robot can navigate and release drugs in a model coronary intervention vessel with tortuous channels and fluid *** novel design and promising applications of this snake robot are invaluable tools in future medical surgeries and interventions.

关键词： 4D printing Magnetic-responsive ink Untethered medical soft robot Snake-like robot Drug delivery

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Tunable natural resonances via synergistic effects of two phases in Fe_(x)(Co_(y)Ni_(1-y))_(100-x)for multi-band microwave absorption

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Journal of Materiomics 2023年第1期9卷 90-98页

作者： Renchao Hu Desheng Pan Xinwei Xu Bin Xiao Hong Wang Department of Materials Science and Engineering Southern University of Science and TechnologyShenzhen518055China Shenzhen Engineering Research Center for Novel Electronic Information Materials and Devices&Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen518055China

Multi-band microwave absorption is becoming ubiquitous owing to the increasingly complex electromagnetic environment driven by the diversity of electronic ***,research on efficient electromagnetic absorbers applicable in both centimeter-wave and millimeter-wave bands to address the electromagnetic interference in 5G networks is highly *** this study,Fe_(x)(Co_(y)Ni_(1-y))_(100-x)particles with two phases(face-centered cubic(FCC)and hexagonal close-packed(HCP))were synthesized and were found to exhibit excellent electromagnetic wave *** phase with high magnetocrystalline anisotropy was introduced into FCC phase Fe_(x)(Co_(y)Ni_(1-y))_(100-x),resulting in natural resonances in multi-band *** microwave absorption properties in ultra-wide bandwidth ranging from 6.9 to 39.5 GHz were *** maximum reflection loss(RL)of the Fe_(23)(Co_(0.5)Ni_(0.5))77 composite film reached-50 *** a remarkable absorption performance is attributed to the synergetic effects of the multiple natural resonances generated by the coexistence of HCP and FCC phases in Fe23(Co0.5Ni0.5)***,this work is promising for the future design of high-performance microwave absorbing materials in a wide bandwidth.

关键词： Submicron particles Microwave absorber Anisotropy Permeability Microstructures

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Development of a bias power supply for Geiger mode avalanche photodiodes

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Optoelectronics Letters 2023年第11期19卷 659-665页

作者： MENG Yinjie WEI Zhengjun YAN Ziling WANG Jindong Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials South China Normal UniversityGuangzhou510006China Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices South China Normal UniversityGuangzhou510006China

Avalanche photodiodes(APDs)have high output and high stability requirements for bias power in Geiger *** paper designs an APD with high boost ratio,high precision,low temperature drift,small size,and low *** power supply,this module uses switching chip IC and flyback transformer to achieve high step-up ratio,realizes precise output control through precision operational amplifier and T-type resistor feedback network,and designs appropriate compensation network to improve system *** size of the module is 2.5 cm×2.5 cm,the output voltage is adjustable from 0 to 450 V,and the maximum ripple does not exceed 5.4 *** changing the control voltage,any type of APD in Geiger mode can be biased,and the maximum deviation of the bias voltage does not exceed 0.5%.

关键词： power network amplifier

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Atomically dispersed Co-Cu alloy reconstructed from metalorganic framework to promote electrochemical CO_(2)methanation

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Nano Research 2023年第3期16卷 3680-3686页

作者： Hao Sun Ling Lin Wei Hua Xulan Xie Qiaoqiao Mu Kun Feng Jun Zhong Fenglei Lyu Zhao Deng Yang Peng Soochow Institute for Energy and Materials Innovations College of EnergySoochow UniversitySuzhou 215006China Jiangsu Key Laboratory of Advanced Negative Carbon Technologies Soochow UniversitySuzhou 215006China Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province Soochow UniversitySuzhou 215006China Institute of Functional Nano&Soft Materials Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Soochow Municipal laboratory for low carbon technologies and industries Soochow UniversitySuzhou 215006China

Electroreduction of carbon dioxide into value-added fuels or chemicals using renewable energy helps to effectively reduce carbon dioxide emission and alleviate the greenhouse effect while storing intermittent *** to the existing infrastructure of global natural gas utilization and distribution,methane produced in such a green route attracts wide ***,limited success has been witnessed in the practical application of catalysts imparting satisfactory methane activity and ***,we report the fabrication of an atomically dispersed Co-Cu alloy through the reconstruction of trace-Co doped Cu metalorganic *** catalyst exhibits a methane Faradaic efficiency of 60%±1%with the corresponding partial current density of 303±5 mA·cm^(−2).Operando X-ray adsorption spectroscopy and attenuated-total-reflection surface enhanced infrared spectroscopy unravel that the introduction of atomically dispersed Co in Cu favors*CO protonation via enhancing surface water activation,and suppresses C−C coupling by reducing*CO coverage,thereby leading to high methane selectivity.

关键词： electrochemical carbon dioxide reduction metal-organic framework methane alloy catalyst reconstruction

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