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High-efficiency thermally activated delayed fluorescence materials via a shamrock-shaped design strategy to enable OLEDs with external quantum efficiency over 38%

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Aggregate 2023年第6期4卷 120-129页

作者： Gaoyu Li Junrong Pu Zhan Yang Huangjun Deng Yanyan Liu Zhu Mao Juan Zhao Shi-Jian Su Zhenguo Chi PCFM Lab GD HPPC LabState Key Laboratory of Optoelectronic Material and TechnologiesGuangdong Engineering Technology Research Center for High performance Organic and Polymer Photoelectric Functional FilmsSchool of ChemistrySun Yat-sen UniversityGuangzhouP.R.China State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices South China University of TechnologyGuangzhouP.R.China Shenzhen Institute of Advanced Electronic Materials Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhenChina State Key Laboratory of Optoelectronic Material and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhouChina

To achieve highly-efficient organic light-emitting diodes(OLEDs),great efforts have been devoted into constructing thermally activated delayed fluorescence(TADF)with high horizontal dipole ratios(Θ//).Here,we proposed a design strategy by integrating a rigid electron-accepting oxygen-bridged boron core with triple electron-donating groups,which exhibited a“shamrock-shape”,namely BO-3DMAC and *** from the rigid and large-planar skeletons brought by shamrock-shaped design,BO-3DMAC and BO-3DPAC exhibit highΘ//of 84%/70%and 93%/94%in neat/doped films,respectively,and finally furnish excellent external quantum efficiencies(EQEs)of up to 28.3%and 38.7%in 20 wt%doped OLEDs with sky-blue emission,as well as adequate EQEs of up to 21.0%and 16.7%in nondoped *** work unveils a promising strategy to establish high-Θ//TADF emitters by constructing large-planar molecular structures using shamrock-shaped design.

关键词： aggregation-induced emission horizontal dipole ratios organic light-emitting diodes sky-blue emission thermally activated delayedﬂuorescence

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Microstructural evolution and mechanical properties of h-BN composite ceramics with Y2O3-AlN addition by liquid-phase sintering

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Rare Metals 2020年第5期39卷 555-561页

作者： Bao-Fu Qiu Xiao-Ming Duan Zhuo Zhang Xing-Qi Liao Zhi-Hua Yang De-Long Cai De-Chang Jia Yu Zhou Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Hexagonal boron nitride(h-BN)composite ceramics were prepared by hot pressing with the addition of Y2O3 and *** effects of different Y2O3–AlN contents on microstructural evolution,mechanical properties and thermal diffusion coefficients of h-BN composite ceramics were *** results indicate that Y2O3–AlN forms a liquid phase during the sintering process achieving a good wettability with h-BN *** pure h-BN ceramic and h-BN composite ceramic with 40 wt%Y2O3–AlN,the h-BN grains grow well when controlled through solid-phase and liquid-phase diffusion,*** the increase in Y2O3–AlN content,mechanical properties and thermal diffusion coefficients of h-BN composite ceramics first decrease and then increase,and the properties of h-BN composite ceramic with 10 wt%Y2O3–AlN are the inflection *** properties are highly related to the phase compositions,porosity and microstructure.

关键词： Hexagonal boron nitride Y2O3–AlN Liquidphase sintering Wettability Mechanical properties

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Compact ultrabroadband light-emitting diodes based on lanthanide-doped lead-free double perovskites

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Light(science & Applications) 2022年第3期11卷 94-106页

作者： Shilin Jin Renfu Li Hai Huang Naizhong Jiang Jidong Lin Shaoxiong Wang Yuanhui Zheng Xueyuan Chen Daqin Chen College of Physics and Energy Fujian Normal UniversityFujian Provincial Key Laboratory of Quantum Manipulation and New Energy MaterialsFuzhou 350117China Fujian Science&Technology Innovation Laboratory for Optoelectronic Information Fuzhou 350116China CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of Nanomaterials and State Key Laboratory of Structural ChemistryFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian 350002China Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering Fuzhou 350117China Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage Fuzhou 350117China College of Chemistry Fuzhou UniversityFuzhou 350116China

Impurity doping is an effective approach to tuning the optoelectronic performance of host materials by imparting extrinsic electronic ***,a family of lanthanide(Ln^(3+))ions was successfully incorporated into a Bi:Cs_(2)AgInCl_(6) lead-free double-perovskite(DP)semiconductor,expanding the spectral range from visible(Vis)to near-infrared(NIR)and improving the photoluminescence quantum yield(PLQY).After multidoping with Nd,Yb,Er and Tm,Bi/Ln:Cs_(2)AgInCl_(6) yielded an ultrabroadband continuous emission spectrum with a full width at half-maximum of~365 nm originating from intrinsic self-trapped exciton recombination and abundant 4f-4f transitions of the Ln^(3+)***-state and transient-state spectra were used to ascertain the energy transfer and emissive *** avoid adverse energy interactions between the various Ln^(3+)ions in a single DP host,a heterogeneous architecture was designed to spatially confine different Ln^(3+)dopants via a“DP-in-glass composite”(DiG)*** bottom-up strategy endowed the prepared Ln^(3+)-doped DIG with a high PLQY of 40%(nearly three times as high as that of the multidoped DP)and superior long-term ***,a compact Vis-NIR ultrabroadband(400~2000 nm)light source was easily fabricated by coupling the DiG with a commercial UV LED chip,and this light source has promising applications in nondestructive spectroscopic analyses and multifunctional lighting.

关键词： dopant tuning double

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A Gas Diffusion Strategy to Engineer Hierarchically Porous Fe-N-C Electrocatalysts for the High-Performance Cathodes of Zn-Air Batteries

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SSRN 2023年

作者： Zhang, Yunxiao Xiao, Wenhua Zhang, Jingqiang Hu, Tiantian Hu, Shanxia Zhou, Minjie Hou, Zhaohui Liu, Yu He, Binhong Key Laboratory of Hunan Province for Advanced Carbon–based Functional Materials School of Chemistry and Chemical Engineering Hunan Institute of Science and Technology Hunan Yueyang414006 China

Non-precious metal electrocatalysts have emerged as the most promising oxygen reduction reaction (ORR) catalyst. However, porous structure engineering and accessibility of Fe-N-C sites still remains a great challenge. Here, a gas diffusion strategy is proposed for constructing hierarchically porous structural Fe-N-C catalysts with dense active Fe–Nx moieties for the cathode of Zn–air batteries. As an ORR electrocatalyst, the Fe–NCNF–120 delivered more positive onset potential and half-wave potential (Eonset = 1.00 V, E1/2 = 0.90 V), high kinetic current density and mass activity towards ORR in alkaline electrolyte. Experiments suggested that the excellent ORR activity stemed from the boosted intrinsic activity of the dense accessible active site Fe-Nx and ordered micro- and mesoporous structure as well as the facilitated mass and electron transport by 3D interconnected pores. As the cathode for Zn-air battery, Fe–NCNF–120 demonstrated high open-circuit voltage, high power density and stability. This work paves a new way for the design and synthesis of efficient electrocatalysts by combing intrinsic activity with dense accessible sites for energy storage and conversion. © 2023, The Authors. All rights reserved.

关键词： Diffusion in gases

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Additive-Free Preparation of High-Toughness Al2o3/Zro2 Nanoceramics with Platelet Grain Through Spontaneously Formed Dendrite

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SSRN 2023年

作者： Liu, Xudong Yu, Yongdong Yuan, Yuchen Wang, Renjie Zhu, Shiyang Bai, Yuelei Fang, Canqing Chen, Ce Zheng, Yongting National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Centre for Composite Materials and Structures Harbin Institute of Technology Harbin150080 China School of Materials Science and Engineering University of Jinan Jinan250024 China

Plate-like grain toughening represents an effective approach to enhance the toughness of ceramics, but most of them require additives to induce the formation of platelets. Herein, we propose a novel method to prepare platelet-toughed Al2O3/ZrO2 ceramics by pressureless sintering without any additives. The Al2O3/ZrO2 powder was prepared via combustion synthesis assisted by rapid water cooling. The synthesis process involved an ultra-high temperature and a rapid cooling rate, leading to the formation of Al-Zr-Y oxide solid solution with γ-Al2O3 or t-ZrO2 structure in the powders. The surface of the powder after being acid etched or annealed was investigated and the results indicated that the solid solution with γ-Al2O3 structure exhibited a dendrite morphology, which could develop into plate-like Al2O3 grains during annealing or pressureless sintering. The platelets can effectively improve the toughness by inducing crack deflection. Besides, many ZrO2 nanoparticles precipitated from the solid solution, which was also conducive to the enhancement of mechanical properties. Consequently, the toughness and the bending strength of the ceramic could reach up to 10.76 MPa·m0.5 and 759 MPa, respectively. Additionally, this method could be applied to fabricate platelet-toughened Al2O3/ZrO2 ceramics in a wide range of Al2O3 contents (60wt%~80wt%), thereby catering to diverse industrial applications. © 2023, The Authors. All rights reserved.

关键词： Platelets

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Fabricaiton of Oxygen-Rich/Nitrogen-Doped Hierarchical Porous Ganoderma Lucidum Spore Activated Carbon for Enhanced Supercapacitor Performance

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SSRN 2023年

作者： Yu, Liu Hu, Shanxia Hu, Tiantian Zhang, Jingqiang Wang, Mengting Zhou, Minjie Hou, Zhaohui He, Binhong Zhang, Yunxiao Key Laboratory of Hunan Province for Advanced Carbon–based Functional Materials School of Chemistry and Chemical Engineering Hunan Institute of Science and Technology Hunan Yueyang414006 China

Hierarchical porous carbon-based biomass is considered to be the most promising functional carbon-based electrode material for energy conversion and storage as a result of its abundant natural resources, low price, multi-heteroatom self-doping, and easy modification. In this paper, Ganoderma lucidum spores-derived carbon materials (GLSC–2) with oxygen-rich/nitrogen-doped three-dimensional, hierarchically connected porous structure were synthesized by a two-step route of pre-carbonization in air followed by KOH etching. It is worth noting that pre-carbonization in air can not only fix the natural cage-like structure of spores, but also introduce a significant number of oxygen-containing functional groups with the help of atmospheric oxygen. The synthesized GLSC–2 exhibits high O (14.27%) and moderate N (1.99%) contents, relatively high specific surface area (1524.7 m2 g-1), and is endowed with high-density micropore and narrow mesoporous distribution, which are key to promoting rapid ion diffusion and improving the electrochemical performance of supercapacitors. Gratifyingly, GLSC–2 has proved to be a satisfactory electrode applied to supercapacitors, which exhibits an attractive specific capacitance value of 261 F g-1 at 1 A g-1 and excellent rate capability. Even at a high current density of 10 A g-1, the capacitance retention rate can still be maintained at 81.6%. After 10000 charge-discharge cycles at 2 A g-1, the capacity retention rate and Coulombic efficiency are maintained at 98.63% and 99.19%, respectively. The power density can approach 500 W kg-1 when the assembled symmetrical supercapacitors (GLSC–2//GLSC–2) have an energy density of 9.03 Wh kg-1. It is possible to keep the energy density at 7.08 Wh kg-1 even at a power density of 5000 W kg-1. This study provides a more economical and convenient route for the production of high-performance oxygen-rich/nitrogen-doped electrode materials based on renewable biomass. © 2023, The Authors. All rights reserved.

关键词： Supercapacitor

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Sandwich-Structured composite Based on Performance-Differentiated Phase Change Materials for Versatile Thermal Management

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SSRN 2025年

作者： Wang, Zihan Li, Xinze He, Chenbo Yang, Rui Yang, Mingyang Tang, Guihua Zhang, Hu Xie, Qi Sun, Jingjing Sun, Chencheng Li, Junning MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an710049 China State Key Laboratory for Strength and Vibration of Mechanical Structures Xi’an Jiaotong University Xi’an710049 China Science and Technology on Advanced Functional Composites Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing100076 China

Improving thermal management materials is crucial for achieving multifunctional integrated applications and enhancing energy efficiency. Though phase change materials exhibit excellent thermal storage properties, the limited thermal conductivity has hindered widespread use in dynamic and complex thermal environments. To address these challenges, we proposed a novel sandwich-structured composite based on composite phase change materials (CPCMs) with gradient thermal conductivities. The composite incorporates n-octadecane/melamine formaldehyde resin microencapsulated phase change materials (MPCM) as the phase change component, with nanoporous silica aerogel (SA) and flake graphite (FG) serving as the thermal insulation skeleton and high-thermal-conductivity support material, respectively. Characterization results revealed that the prepared CPCMs exhibited excellent shape stability and mechanical strength. Specifically, the SA/PCM composite demonstrated an ultralow thermal conductivity of 0.0725 W·m−1·K−1 and a phase change enthalpy of 109 J·g−1. In contrast, the thermal conductivity of FG/PCM composites increased significantly to 0.48–2.934 W·m−1·K−1 with 10–50 wt% FG loading, reaching up to 13.5 times that of pure MPCM. Transient thermal shock and multidirectional non-uniform heat disturbance tests confirmed the exceptional thermal insulation and temperature regulation capabilities in complex environments. Furthermore, tests based on real outdoor temperatures demonstrated that rooms equipped with the sandwich composite maintained more stable indoor temperatures, with a single-day maximum indoor temperature reduction of 3.15 °C than that using pure aerogel. These findings highlight the significant potential of the proposed sandwich-structured composite for advanced thermal management applications. © 2025, The Authors. All rights reserved.

关键词： Thermal insulation

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Microstructure and high-temperature wear behavior of TiZrNbAlx light-weight refractory high-entropy alloy coatings prepared by laser cladding on Ti6Al4V titanium alloy

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Surface and Coatings technology 2025年 512卷

作者： Liu, Yaxia Liu, Hongxi Chen, Yang Wen, Ming Niu, Ben Zhang, Xiaowei Liu, Haifang The Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming650093 China National-local Joint Engineering Research Center for Technology of Advanced Metallic Solidification Forming and Equipment Kunming650093 China State Key Laboratory of Precious Metal Functional Materials Kunming Institute of Precious Metals Kunming650106 China China-Ukraine Institute of Welding Guangdong Academy of Sciences Guangdong Provincial Key Laboratory of Material Joining and Advanced Manufacturing Guangzhou510650 China

The TiZrNbAlx (x = 0.1, 0.2, 0.3) light-weight refractory high-entropy alloys coatings were fabricated on the Ti6Al4V titanium alloy by laser cladding technology. The effect of Al content on the microstructure and wear behavior of the coatings were investigated. All coatings were composed of the BCC phase and a few Zr-rich phase. The grains were refined as the Al content increased, and the Zr-rich phase increased. The TiZrNbAl0.3 exhibited the best wear resistance at room temperature and 500 °C. Compared to Ti6Al4V, the wear rate of TiZrNbAl0.3 decreased by 48.54 % and 15.7 % at room temperature and 500 °C, respectively. Molecular dynamics simulations were used to study the wear behavior of TiZrNbAl0.3 coating at different temperatures, and the results showed that the thermal vibrations and random motion of the interface atoms are enhanced at 500 °C, weakening the crystalline characteristics of the interface, promoting strain accumulation in the TiZrNbAl0.3 coating, and further worsening the material wear. As a result, the wear resistance of the coatings at 500 °C is lower than at room temperature. © 2025

关键词： Thermal fatigue

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通过介导相分离制备的纳米结构W-Cu基复合材料的性能

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Engineering 2023年第7期26卷 173-184,I0007页

作者：侯超吕皓赵治 Xintao Huang 韩铁龙 Junhua Luan Zengbao Jiao 宋晓艳 Zuoren Nie Key Laboratory of Advanced Functional Materials Ministry of EducationFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Department of Materials Science and Engineering City University of Hong KongHong Kong 999077China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China

The challenge of fabricating nanostructured W–Cu composites by powder metallurgy has been solved by means of modulated phase separation.A hierarchically nanostructured(HN)W–Cu composite was prepared using intermediary Al through sluggish asynchronous phase *** addition to a dual network composed of a Cu phase and the W–Cu nanostructure,dense Al-containing nanoprecipitates with a body-centered cubic(bcc)structure are distributed in the W *** with a pristine W/Cu interface,the newly formed W/Cu interfaces modulated by Al and the coherent W/Al-containing particle interfaces possess lower energy and enhanced bonding strength due to efficient electron transfer and strong coupling *** a large number of stable heterogeneous interfaces and a“selflocking”geometry,the HN W–Cu composite exhibits excellent resistance against plastic *** combination of the presented composite’s hardness and compressive strength outperforms all other sintered W–Cu composites with the same Cu *** a reciprocating sliding load,the reactive Al prevents excessive *** excellent synergy of the hardness and toughness of the friction-induced surface endows the HN composite with high abrasion *** study provides a new strategy to modulate the structure and energy state of interfaces in metallic composites containing immiscible components in order to achieve high mechanical performance.

关键词： Immiscible-component composite Phase separation Nanostructure Mechanical properties Interface modulation

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Recent advances in recyclable thermosets and thermoset composites based on covalent adaptable networks

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Journal of Materials science & technology 2021年第33期92卷 75-87页

作者： Yihe Zhang Li Zhang Guotao Yang Yalin Yao Xu Wei Tianchi Pan Juntao Wu Moufeng Tian Penggang Yin Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes School of Materials Science and TechnologyChina University of GeosciencesBeijing 100083China Beijing Composite Materials Co. Ltd.Beijing 102101China State Key Laboratory of Advanced Fiber Composites Beijing 102101China School of Chemistry Beihang UniversityBeijing 100191China

Recyclable thermosets and thermoset composites with covalent adaptable networks(CANs,or dynamic covalent networks) have attracted considerable attention in recent years due to the combined merits of excellent mechanical and thermal properties,and chemical stabilities of traditional thermosets and recyclable,remoldable,and reprocessable attributes of *** this paper,we present an overview of the current strategies for synthesizing recyclable thermosets based on CANs,which involve recyclability,reprocessability,and possible *** recent literature examples are categorized based on the underlying controlled-cleavable linkages such as transesterification,DA/retro-DA chemistry,imine bonds,disulfide metathesis,dynamic B-O bonds,hemiaminals/hexahydrotriazines,and acetal *** degradation and malleability methods and resulting mechanical properties of the recycled thermosets and thermoset composites are *** emerging applications of recyclable thermosets and thermoset composites,with emphasis on their usage in adhesives,biomedical materials,wearable devices,coatings,and 3D printing materials,are also ***,a perspective on the challenges and future perspectives is briefly summarized.

关键词： Covalent adaptable networks(CANs) Recyclable Crosslink Degradation Property

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