检索结果-内蒙古大学图书馆

Enhanced Quantum Efficiency via Co-Substitution in Red-Emitting Phosphor Sr2[MgAl5N7] : Eu2+for Advanced Spectroscopic Applications Including Laser Displays with Ultra-High Luminescence Saturation Threshold

引用

Angewandte Chemie 2024年第7期137卷

作者： Zebin Li Haoyang Wang Zhezhe Su Runtian Kang Takatoshi Seto Yuhua Wang National & local Joint Engineering Laboratory for Optical Conversion Materials and Technology School of Materials and Energy Lanzhou University 730000 Lanzhou China

In order to obtain novel and more efficient red light-emitting materials, a series of Sr 2 [Mg 1−x Li x Al 5−x Si x N 7 ] : 0.01Eu 2+ (SMAN-xLS, 0≤x≤0.5) red phosphors were devised and successfully synthesized via the high temperature solid state reaction and the effects of the co-substitution of [Mg−Al] 5+ by [Li−Si] 5+ on structural and luminescence properties is investigated in detail. A series of powder XRD data and Rietveld refinement indicate that [Li−Si] 5+ co-substitution can successfully enter the Sr 2 [MgAl 5 N 7 ] : 0.01Eu 2+ (SMAN) lattice. With the entry of [Li−Si] 5+ into the lattice, the substitution of Al 3+ by Si 4+ leads to the weakening of the nephelauxetic effect of the 5d level of Eu 2+ , which shifts the emission peak from 657 nm to 647 nm and reduces the excitation in the green region, i.e., lowers the absorption of green light. When the amount of [Li−Si] 5+ co-substitution is x =0.1, the luminescence intensity and thermal stability of the sample are enhanced, in which the external quantum efficiency (EQE), reflecting the luminescence intensity, is elevated by 49.6 %. The increase in lattice rigidity gives rise to higher luminescence intensity, and the introduced trap levels for the compensation of luminescence enhances the thermal stability. Under blue laser excitation, the SMAN-0.1LS can achieve an ultra-high luminescence saturation threshold of 52.22 W/mm 2 , which is remarkably superior to other existing red phosphors, a breakthrough performance that has enormous potential for application in high-power laser display light sources. Cathodoluminescence (CL) characterization and measurements attest to the favorable CL properties of SMAN-0.1LS. By measuring the pressure-dependent luminescence of SMAN-0.1LS, the emission peak can be shifted from 650 nm to 702 nm with the increase of pressure, and the sensitivity dλ/dP is 5.07 nm/GPa, which is indicative of the potential application of this system as an optical pressure sensor.

关键词： nitride phosphor substitution photoluminescence thermal stability laser cathodoluminescence high pressure

来源：评论

学校读者我要写书评

暂无评论

On the accurate characterization of quantum-dot light-emitting diodes for display applications

引用

npj Flexible Electronics 2022年第1期6卷 351-362页

作者： Wangxiao Jin Yunzhou Deng Bingbing Guo Yaxiao Lian Baodan Zhao Dawei Di Xiaowei Sun Kai Wang Shuming Chen Yixing Yang Weiran Cao Song Chen Wenyu Ji Xuyong Yang Yuan Gao Shuangpeng Wang Huaibin Shen Jialong Zhao Lei Qian Fushan Li Yizheng Jin Key Laboratory of Excited-State Materials of Zhejiang Province State Key Laboratory of Silicon MaterialsDepartment of ChemistryZhejiang University310027 HangzhouChina State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang University310027 HangzhouChina Department of Electronic and Electrical Engineering Southern University of Science and Technology518055 ShenzhenChina TCL Research ShenzhenGuangdongChina Shenzhen China Star Optoelectronics Semiconductor Display Technology Co. LtdShenzhenGuangdongChina College of Chemistry Chemical Engineering and Materials ScienceSoochow University199 Ren’ai Rd215123 SuzhouJiangsuChina Key Lab of Physics and Technology for Advanced Batteries(Ministry of Education) College of PhysicsJilin University130023 ChangchunChina Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai University149 Yanchang RoadShanghai 200072China Najing Technology Corporation Ltd Hangzhou 310052China Institute of Applied Physics and Materials Engineering University of MacaoTaipaMacaoSAR 999078China Key Laboratory for Special Functional Materials of Ministry of Education National&Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technologyand Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China School of Physical Science and Technology MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and MaterialsGuangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China Division of Functional Materials and Nanodevices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108China

Quantum dot light-emitting diodes(QLEDs)are a class of high-performance solution-processed electroluminescent(EL)devices highly attractive for next-generation display *** the encouraging advances in the mechanism investigation,material chemistry,and device engineering of QLEDs,the lack of standard protocols for the characterization of QLEDs may cause inaccurate measurements of device parameters and invalid comparison of different ***,we report a comprehensive study on the characterizations of QLEDs using various *** show that the emission non-uniformity across the active area,nonLambertian angular distributions of EL intensity,and discrepancies in the adopted spectral luminous efficiency functions could introduce significant errors in the device *** errors in the operational-lifetime measurements may arise from the inaccurate determination of the initial luminance and inconsistent methods for analyzing the luminance-decay ***,we suggest a set of recommended practices and a checklist for device characterizations,aiming to help the researchers in the QLED field to achieve accurate and reliable measurements.

关键词： diodes characterization luminous

来源：评论

学校读者我要写书评

暂无评论

Breaking the periodic arrangement of atoms for the enhanced electrochemical reduction of nitrogen and water oxidation

引用

Science China materials 2022年第1期65卷 147-154页

作者： Shilong Jiao Xianwei Fu Shuangchen Ruan Yu-Jia Zeng Hongwen Huang College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China College of Materials Science and Engineering Hunan UniversityChangsha 410082China Key Lab for Special Functional Materials of Ministry of Education Collaborative Innovation Center of Nano Functional Materials and ApplicationsHenan UniversityKaifeng 475004China National&Local Joint Engineering Research Center for Applied Technology of Hybrid Nanomaterials Henan UniversityKaifeng 475004China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China

The development of cost-effective and highperformance electrocatalysts has been increasingly studied to mitigate upcoming energy and environmental *** and heterointerface engineering have played significant roles in the rational design of electrocatalysts and modulation of their electrocatalytic ***,the synergistic effect between amorphization and heterointerfaces has been scarcely *** a proof-of-concept attempt,we develop amorphous FeMo(a-FeMo)electrocatalysts with an abundance of heterointerfaces that are composed of amorphous components and evaluate their electrocatalytic performances toward the nitrogen reduction reaction and oxygen evolution reaction(OER).Benefitting from the synergistic effect between the amorphous nature of the a-FeMo electrocatalysts,which offer a high density of active sites,and significant electron redistribution at the heterointerfaces,the electrocatalysts exhibit a high Faradaic efficiency of 29.15%,an elevated yield rate of 71.78μg_(NH_(3)) mg_(cat.)^(-1) h^(-1) with long-term stability at a potential of-0.1V *** hydrogen electrode and excellent electrocatalytic activity toward the *** study provides a promising and effective method for the rational design of low-cost heterogeneous catalysts with desirable efficiency,selectivity,and stability.

关键词： amorphism and heterointerface nitrogen reduction reaction OER electrocatalyst design electrocatalytic conversion

来源：评论

学校读者我要写书评

暂无评论

Site preference and the optical thermometry strategy by different temperature response from two sites environment of Mn2+ in K7ZnSc2B15O30

Site preference and the optical thermometry strategy by diff...

引用

中国稀土学会2021学术年会

作者： Ying Fu Chao Li Feng Zhang Shixiang Huang Zhangyue Wu Yuhua Wang Zhengzheng Zhang Key Lab of Photovoltaic Materials of Henan Province Henan University National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology Lanzhou University

A novel optical thermometry strategy based on different temperature response from two sites environment of Mnin KZnScBO:Mnhad been *** color tunable Mndoped KZnScBO luminescence materials were successfully prepared,and the photoluminescence properties were *** density functional theory,the electronic structure was *** calculated result showed that KZnScBO was a direct-band gap material with the energy gap of 4.22 *** the excitation of UV light,the photoluminescence spectra of KZnScBO:Mnphosphors demonstrated two emission bands centered at 584 nm and 675 nm attributed to the substitution of Znand Scsites with *** on the concentration of Mn,the emitting color can be tunable from yellow to red in the Mndoped single-phase *** temperature-dependent luminescence properties of KZnScBO:Mnwas anlysized range from 300 to 520 *** results indicated that the thermal quenching properties of Mnat the two kinds of lattice sites are *** Mnoccupied the position of Sc,the luminescence intensity decreased significantly with the increasing of temperature,on the contrary,when Mnoccupied the position of Zn,the luminescence intensity decreased slightly with the rise of *** situation caused a significant change in the fluorescence intensity ratio of the two emission *** study showed that the typical phosphor had a high relative and absolute sensitivity respectively with maximum value of 1.84%K and 0.0311 K at 520 K,and the temperature resolution is about 0.8 *** results indicated that the single Mndoped KZnScBO materials showed a potential application for optical thermometry.

关键词： site preference photoluminescence properties multiband emission temperature response optical thermometry

来源：评论

学校读者我要写书评

暂无评论

Construction and Regulation of a Perovskite-Type Sulfur Reduction Catalyst Based on Oxygen Vacancy engineering for Advanced Lithium-Sulfur Batteries

SSRN

引用

SSRN 2024年

作者： Huang, Xuelin Zeng, Peng Lu, Yunfeng Yang, Juan Chen, Manfang Liu, Hong Wang, Xianyou National Base for International Science & Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage Battery Hunan Province Key Laboratory of Electrochemical Energy Storage & Conversion School of Chemistry Xiangtan University Xiangtan411105 China Key Laboratory for Theoretical Organic Chemistry and Functional Molecules Ministry of Education Hunan University of Science and Technology Xiangtan411201 China

Lithium-sulfur batteries are considered as a promising energy storage solution due to their considerably high theoretical capacity of 1675 mAh g-1 and high energy density of 2600 Wh kg-1. Nevertheless, the lithium-sulfur batteries in commercial application is facing some challenges such as the shuttle effect. In this paper, the perovskite-type La2Ti2O7-x with oxygen defect is developed and applied as an advanced catalyst in lithium-sulfur batteries. It is found that La2Ti2O7-x with oxygen defects can not only strengthen the chemical binding between the metal sites and LiPSs, but also provide additional adsorption and catalytic sites. The as-prepared La2Ti2O7-x/S cathodes exhibit a high initial discharge specific capacity of 1047 mAh g-1 at 1 C (1 C=1675 mA g-1), and a capacity decay rate of merely 0.089% per cycle after 500 cycles. Therefore, this study demonstrates a significant approach to producing high-performance lithium-sulfur batteries using perovskite transition metal oxides as high efficiency electrocatalyst. © 2024, The Authors. All rights reserved.

关键词： Transition metals

来源：评论

学校读者我要写书评

暂无评论

HI hydrolysis-derived intermediate as booster for CsPbI3 perovskite: from crystal structure, film fabrication to device performance

引用

Journal of Semiconductors 2020年第5期41卷 15-25页

作者： Zhizai Li Zhiwen Jin School of Physical Science and Technology&Key Laboratory for Magnetism and Magnetic Materials(MoE)&Key Laboratory of Special Function Materials and Structure Design(MoE)&National&Local Joint Engineering Laboratory for Optical Conversion Materials and Technology Lanzhou UniversityLanzhou 730000China

Nowadays,inorganic CsPbI3 perovskite solar cells(PSCs)have become one of the most attractive research hotspots in photovoltaic field for its superior chemical stability and excellent photo-electronic *** the first independent report in 2015,the power conversion efficiency(PCE)of CsPbI3 based PSCs has sharply increased from 3.9%to 19.03%.Importantly,during the developing process of CsPbI3 PSCs,HI hydrolysis-derived intermediate plays an important role:from stabilizing the crystal structure,optimizing the fabricated film to boosting the device *** this review,the different crystal and electronic structures of CsPbI3 are *** then trace the history and disputes of HI hydrolysis-derived intermediate to make this review more ***,we highlight the functions of HI hydrolysis-derived intermediate,and systematically summarize the advanced works on CsPbI3 ***,the bottlenecks and prospects are revealed to further increase the CsPbI3 PSCs performance.

关键词： CsPbI3 HI intermediate crystal structure stability

来源：评论

学校读者我要写书评

暂无评论

Enhanced performance of CdS/CdSe quantum dotsensitized solar cells by long-persistence phosphors structural layer

引用

Science China materials 2020年第4期63卷 516-523页

作者： Yunlong Deng Shuqi Lu Zhiyuan Xu Jiachi Zhang Fei Ma Shanglong Peng National 8c Local Joint Engineering Laboratory for Optical Conversion Materials and Technology School of Physical Science and TechnologyLanzhou UniversityLanzhou 730000China

Light absorption plays an important role in improving the power conversion efficiency(PCE)of quantum dot-sensitized solar cells(QDSSCs).In this study,a multifunctional long-persistence phosphor(LPP)layer was introduced into the CdS/CdSe QDSSCs via a simple doctor blade *** LPP layer can simultaneously improve the light harvesting and photo charge transfer in CdS/CdSe *** a result,their short-circuit current and corresponding PCE are effectively *** PCE can reach up to 5.07%,which is about 24%larger than that of the conventional CdS/CdSe QDSSCs without LPP *** solar cells can work in dark for a while due to the long-lasting fluorescence of the LPP *** research provides an effective way to improve the PCE of QDSSCs,and finds the possibility for all-weather QDSSCs.

关键词： quantum dot-sensitized solar cells all-weather solar cells long-persistence phosphors power conversion efficiency

来源：评论

学校读者我要写书评

暂无评论

Enhanced Energy Storage Performance of Nico-Ldh Nanosheets Decorated on Biomass-Derived Carbon Microtubes from Natural Poplar Catkins for Advanced Hybrid Supercapacitors

SSRN

引用

SSRN 2024年

作者： Li, Wei Qian, Guo Guanjie, Ren Zhuokun, Li Jiachang, Li Hongwei, Yue Tingting, Li Li, Pinjiang Lou, Xiaojie Key Laboratory of Micro-Nano Materials for Energy Storage and Conversion of Henan Province Institute of Surface Micro and Nano Materials College of Chemical and Materials Engineering Xuchang University Henan461000 China Key Laboratory for Special Functional Materials of Ministry of Education National & Local Joint Engineering Research Center for High-efficiency Display and Lighting Technology School of Nanoscience and Materials Engineering Collaborative Innovation Center of Nano Functional Materials and Applications Henan University Kaifeng475004 China Henan Joint International Research Laboratory of Nanomaterials for Energy China Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi’an710049 China Shaanxi Normal University China

Nickel-cobalt layered double hydroxides (NiCo-LDHs) are promising electrode materials for hybrid supercapacitors (HSCs) due to their high theoretical charge storage capacity and excellent reversibility. However, their practical application is limited by low electrical conductivity and a tendency to agglomerate, which suppress their electrochemical performance. To address these challenges, NiCo-LDH NSs/CMT-PC composite electrode material is synthesized via a hydrothermal method. This composite integrates NiCo-LDH nanosheets (NiCo-LDH NSs) as a coating and carbon micro-tubes derived from poplar catkins (CMT-PC) with a high specific surface area as the framework. In a three-electrode system, the NiCo-LDH NSs/CMT-PC electrode demonstrated a specific capacity of 228.4 mAh g-1 (1644.5 F g-1, 822.2 C g-1) at a current density of 1 A g-1, and maintained a specific capacity of 101.7 mAh g-1 (732.2 F g-1, 366.1 C g-1) even at 30 A g-1. After 5000 cycles, the material exhibited excellent stability, retaining 96.5% of its capacity, with a decrease from 193.6 mAh g-1 to 186.9 mAh g-1. To explore its practical application in HSCs, we assembled NiCo-LDH NSs/CMT-PC//AC HSCs, using the NiCo-LDH NSs/CMT-PC as the positive electrode and activated carbon (AC) as the negative electrode. The assembled device exhibited a specific capacity of 88.3 mAh g-1 at 1 A g-1 and an energy density of 72.2 Wh kg-1 at a power density of 508.6 W kg-1. Impressively, after 9000 cycles at 3 A g-1, the specific capacity increased from 64.2 mAh g-1 to 66.5 mAh g-1, demonstrating exceptional cycling stability and suitability for practical applications. © 2024, The Authors. All rights reserved.

关键词： Nanosheets

来源：评论

学校读者我要写书评

暂无评论

Band offsets and electronic properties of the Ga_(2)O_(3)/FTO heterojunction via transfer of free-standing Ga_(2)O_(3) onto FTO/glass

引用

Chinese Physics B 2021年第11期30卷 385-388页

作者： Xia Wang Wei-Fang Gu Yong-Feng Qiao Zhi-Yong Feng Yue-Hua An Shao-Hui Zhang Zeng Liu Department of Electrical Engineering and Automation Shanxi Institute of TechnologyYangquan 045000China School of Optoelectronic Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510665China Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of EducationCollege of Optoelectronic EngineeringShenzhen UniversityShenzhen 518060China College of Electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210023China National and Local Joint Engineering Laboratory for RF Integration and Micro-Packing Technologies Nanjing University of Posts and TelecommunicationsNanjing 210023China

The determination of band offsets is crucial in the optimization of Ga_(2)O_(3)-based devices,since the band alignment types could determine the operations of devices due to the restriction of carrier transport across the heterogeneous *** this work,the band offsets of the Ga_(2)O_(3)/FTO heterojunction are studied using x-ray photoelectron spectroscopy(XPS)based on Kraut’s method,which suggests a staggered type-II alignment with a conduction band offset(DEC)of 1.66 eV and a valence band offset(DEV)of􀀀2.41 ***,the electronic properties of the Ga_(2)O_(3)/FTO heterostructure are also measured,both in the dark and under ultraviolet(UV)illuminated conditions(254 nm UV light).Overall,this work can provide meaningful guidance for the design and construction of oxide hetero-structured devices based on wide-bandgap semiconducting Ga_(2)O_(3).

关键词： Ga_(2)O_(3)/FTO heterojunction band alignment magnetron sputtering free-standing

来源：评论

学校读者我要写书评

暂无评论

Free-standing ternary metallic sulphides/Ni/C-nanofiber anodes for high-performance lithium-ion capacitors

引用

Journal of Energy Chemistry 2020年第3期29卷 108-115页

作者： Ting Xing Yinghui Ouyang Liping Zheng Xianyou Wang Hong Liu Manfang Chen Ruizhi Yu Xingyan Wang Chun Wu National Base for International Science and Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage BatteryHunan Province Key Laboratory of Electrochemical Energy Storage and ConversionSchool of ChemistryXiangtan UniversityXiangtan 411105HunanChina College of Material Science and Engineering Changsha University of Science&TechnologyChangsha 410114HunanChina

As a promising energy-storage device,the hybrid lithium-ion capacitor coupling with both a large energy density battery-type anode and a high power density capacitor-type cathode is attracting great *** the sake of improving the energy density of hybrid lithium-ion capacitor,the free-standing anodes with good electrochemical performance are ***,we design an effective electrospinning strategy to prepare free-standing MnS/Co4S3/Ni3S2/Ni/C-nanofibers(TMSs/Ni/C-NFs)film and firstly use it as a binder-free anode for hybrid lithium-ion *** find that the carbon nanofibers can availably prevent MnS/Co4S3/Ni3S2/Ni nanoparticles from aggregation as well as significantly improve the electrochemical ***,the binder-free TMSs/Ni/C-NFs membrane displays an ultrahigh reversible capacity of 1246.9 m Ah g-1at 100 m A g-1,excellent rate capability(398 mAh g-1 at2000 mA g-1),and long-term cyclic ***,we further assemble the hybrid lithium-ion capacitor,which exhibits a high energy density of 182.0 Wh kg-1at 121.1 W kg-1(19.0 Wh kg-1 at 3512.5 W kg-1)and remarkable cycle life.

关键词： Electrospinning Free-standing Ternary metallic sulphides Hybrid lithium-ion capacitor Energy density

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：