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KRbAl2B2O7: Eu2+: A new blue-emitting luminescent material with good thermal stability

optical materials: X 2022年 13卷

作者： Chen, Hang Wang, Yuhua China Gansu Province Engineering Laboratory for Optical Functional Materials National& Local Joint Engineering Laboratory for Optical Conversion Materials and Technology School of Materials and Energy Lanzhou University Lanzhou730000 China

Exploring new efficient phosphor for lighting has always been a worthwhile and necessary work. Herein, we develop a new blue-emitting luminescent material KRbAl2B2O7:Eu2+ through the solid-state method. Under n-UV excitation, this phosphor can emit blue light peaking at 450 nm with FWHM about 55 nm. It owns a broad excitation spectrum covering from 250 nm to 425 nm. Two luminescent centers were identified through the analysis of crystal structure and decay times. Furthermore, the phosphor shows high thermal stability and the emission intensity remains about 81% at 425 K of that at room temperature. The thermal quenching is mainly attributed to the increase of non-radiative transition and thermally activated phonon-assisted tunneling effect at high temperature. By employing as-prepared material as blue phosphor, the fabricated white LED device can emit white light with high CRI (Ra = 85.6) and low CCT (4236 K). These results illustrate that the possibility of KRbAl2B2O7 as a blue-emitting phosphor for practical application. © 2022

关键词： Luminescence

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Wire-in-Wire TiO_(2)/C Nanofibers Free-Standing Anodes for Li-Ion and K-Ion Batteries with Long Cycling Stability and High Capacity

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Nano-Micro Letters 2021年第7期13卷 91-104页

作者： Die Su Yi Pei Li Liu Zhixiao Liu Junfang Liu Min Yang Jiaxing Wen Jing Dai Huiqiu Deng Guozhong Cao 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 411105People’s Republic of China Department of Materials Science and Engineering University of WashingtonSeattleWA 98195-2120USA College of Materials Science and Engineering Hunan UniversityChangsha 410082People’s Republic of China School of Physics and Electronics Hunan UniversityChangsha 410082People’s Republic of China

Wearable and portable mobile phones play a critical role in the market, and one of the key technologies is the flexible electrode with high specific capacity and excellent mechanical flexibility. Herein, a wire-in-wire TiO_(2)/C nanofibers (TiO_(2) ww/CN) film is synthesized via electrospinning with selenium as a structural inducer. The interconnected carbon network and unique wire- in-wire nanostructure cannot only improve electronic conductivity and induce effective charge transports, but also bring a superior mechanic flexibility. Ulti-mately, TiO_(2) ww/CN film shows outstanding electrochemical performance as free-standing electrodes in Li/K ion batteries. It shows a discharge capacity as high as 303 mAh g^(−1) at 5 A g^(−1) after 6000 cycles in Li half-cells, and the unique structure is well-reserved after long-term cycling. Moreover, even TiO_(2) has a large diffusion barrier of K^(+), TiO_(2) ww/CN film demonstrates excellent perfor-mance (259 mAh g^(−1) at 0.05 A g^(−1) after 1000 cycles) in K half-cells owing to extraordinary pseudocapacitive contribution. The Li/K full cells consisted of TiO_(2) ww/CN film anode and LiFePO_(4)/Perylene-3,4,9,10-tetracarboxylic dianhydride cathode possess outstanding cycling stability and demonstrate practical application from lighting at least 19 LEDs. It is, therefore, expected that this material will find broad applications in portable and wearable Li/K-ion batteries.

关键词： Free-standing TiO_(2)/C nanofiber Li-ion battery K-ion battery First-principles calculation Full cells

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Adjusting the SnZn defects in Cu_(2)ZnSn(S,Se)_(4) absorber layer via Ge^(4+) implanting for efficient kesterite solar cells

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Journal of Energy Chemistry 2021年第10期30卷 1-7,I0001页

作者： Yueqing Deng Zhengji Zhou Xin Zhang Lei Cao Wenhui Zhou Dongxing Kou Yafang Qi Shengjie Yuan Zhi Zheng Sixin Wu Key Lab for Special Functional Materials Ministry of EducationNational and Local Joint Engineering Research Center for High-Efficiency Display and Lighting TechnologyAnd School of MaterialsHenan UniversityKaifeng 475004HenanChina Collaborative Innovation Centre of Nano Functional Materials and Applications HenanChina Key Laboratory for Micro-Nano Energy Storage and Conversion Materials of Henan Province College of Advanced Materials and EnergyInstitute of Surface Micro and Nano MaterialsXuchang UniversityXuchang 461000HenanChina

The development of kesterite photovoltaic solar cells has been hindered by large open-circuit voltage(V_(oc))***,Snzn deep point defect and associative defect cluster have been recognized as the main culprit for the Voc ***,manipulating the deep-level donor of Snzn antisite defects is crucial for breaking through the bottleneck of present Cu_(2) ZnSn(S,Se)_(4)(CZTSSe)photovoltaic *** this study,the Snzn deep traps in CZTSSe absorber layer are suppressed by incorporation of *** energy levels and concentration of Snzn defects measured by deep-level transient spectroscopy(DLTS)decrease *** addition,the grain growth of CZTSSe films is also promoted due to Ge implantation,yielding the high quality absorber ***,the efficiency of CZTSSe solar cells increases from 9.15%to 11.48%,largely attributed to the 41 mV Voc increment.

关键词： CZTSSe Defect Absorber layer Solar cells V_(oc)

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Flower-like ZnO modified with BiOI nanoparticles as adsorption/catalytic bifunctional hosts for lithium–sulfur batteries

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Journal of Energy Chemistry 2020年第12期29卷 21-29页

作者： Peng Zeng Hao Yu Manfang Chen Wensheng Xiao Yongfang Li Hong Liu Jing Luo Jiao Peng Dingsheng Shao Ziyi Zhou Zhigao Luo Ying Wang Baobao Chang Xianyou Wang National Base for International Science&Technology Cooperation National Local Joint Engineering Laboratory for Key Materials of New Energy Storage BatteryHunan Province Key Laboratory of Electrochemical Energy Storage&ConversionSchool of ChemistryXiangtan UniversityXiangtan 411105HunanChina Department of Chemistry The Chinese University of Hong KongShatinN.T.Hong KongChina Key laboratory of Materials Processing and Mold of Ministry of Education Zhengzhou UniversityZhengzhou 450001HenanChina

Due to the high specific capacity and energy density, lithium–sulfur battery is regarded as a potential energy storage conversion system. However, the serious shuttle effect and the sluggish electrochemical reaction kinetics impede the practical use of lithium–sulfur battery. In the interests of breaking through the above knotty problems, herein we propose to use the polar flower-like Zn O modified by Bi OI nanoparticles as bifunctional host with catalytic and adsorption ability for polysulfides in lithium–sulfur *** can be found that this adsorption/catalytic host integrates the functions of adsorption and mutual catalytic conversion of polysulfides, in which the polar flower-like Zn O can effectively capture the polysulfides through strong polar-polar interaction, simultaneously the BiOI nanoparticles can accelerate the mutual conversion of polysulfides to Li2 S through reducing the activation energy and conversion energy barrier required for the electrochemical reaction. As a result, under a sulfur loading of 2.5 mg cm^(-2), the lithium–sulfur battery with Zn O/Bi OI/CNT/S as cathode reveals a considerable initial specific capacity of1267 mAh g^(-1) at a current density of 0.1 C. Even the current density increased to 1 C, the capacity can reach as 873.4 mAh g^(-1), together with a good capacity retention of 67.1% after 400 cycles. Therefore,after systematically study the positive effects of the flower-like ZnO modified by catalytic BiOI nanoparticles on the adsorption and catalytic conversion of polysulfides, this work provides a new idea for the development and application of high-performance lithium–sulfur batteries.

关键词： Flower-like ZnO BiOI nanoparticles Mutual catalytic conversion Shuttle effect Lithium–sulfur batteries

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Valley splitting in the van der Waals heterostructure WSe2/CrI3: The role of atom superposition

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Physical Review B 2019年第11期99卷 115441-115441页

作者： Zhiya Zhang Xiaojuan Ni Huaqing Huang Lin Hu Feng Liu National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology Lanzhou University Lanzhou 730000 China Department of Materials Science and Engineering The University of Utah Salt Lake City Utah 84112 USA

A recent experiment shows that the K′K valley degeneracy can be lifted in monolayer WSe2 deposited on a layered ferromagnetic substrate of CrI3. In this work, we take a van der Waals heterostructure WSe2/CrI3 to model the monolayer WSe2 on the CrI3 substrate and investigate the effects underpinning the K′K valley splitting based on first-principles calculations. We demonstrate that the interfacial atom superposition plays an important role and a W-Cr superposition is essential for a relatively large valley splitting. The results indicate inevitable sample-to-sample variations in the K′K valley splitting in the WSe2/CrI3. Furthermore, we show that the K′K valley splitting can be tuned in the trilayer CrI3/WSe2/CrI3 from nearly zero to more than two times of that in the bilayer WSe2/CrI3 by manipulating the layer alignment.

关键词： Electronic structure of atoms & molecules First-principles calculations Valleytronics

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A Novel Narrow Blue-Emitting Phosphor Sr2bn2cl:Eu2+ with Excellent Thermal Stability

SSRN

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SSRN 2022年

作者： Wang, Haoyang Ma, Bo Li, Zebin Kang, Runtian Ji, Ruijie Wang, Yuhua National & Local Joint Engineering Laboratory for Optical Conversion Materials and Technology School of Materials and Energy Lanzhou University Lanzhou730000 China

Owing to the broad application scope of phosphors for light and display, the development of narrow-band light-emitting phosphors has recently gained considerable research attention. In this work, a novel nitride-based phosphor: Sr 2 BN 2 Cl:Eu 2+ has been successfully synthesized by solid-state reaction. Sr 2 BN 2 Cl:Eu 2+ shows wide absorption band ranging from 200 to 400nm and exhibits a narrow band emission peaking at 450 nm with a full width at half maximum ∼60 nm. More importantly, excellent thermal stability was also discovered, which showed that it still retained 87.4% and 100% of room temperature intensity at 150°C and 250°C, respectively. The presence of rigid skeleton formed by the co-edge connection of Sr(N, Cl) 6 octahedra and defects in the crystal is responsible for the excellent thermal stability of the phosphor. In addition, two types of white led devices have been prepared to test this phosphor for lighting and display applications. The former shows excellent color rendering index (CRI=92.0) and low correlated color temperature (CCT=3190K). The latter shows that using Sr 2 BN 2 Cl:Eu 2+ , β-sialon:Eu 2+ and K 2 SiF 6 :Mn 4+ together for backlit displays can cover 73.3% of the NTSC area which is comparable to commercial BaMgAl 10 O 17 :Eu 2+ phosphors. These results indicate that Eu 2+ doped Sr 2 BN 2 Cl will be a promising blue phosphor for lighting and backlight displays. © 2022, The Authors. All rights reserved.

关键词： Phosphors

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Mechanistic Insights Into H2O Dissociation in Overall Photo-/Electro-Catalytic CO2Reduction

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Angewandte Chemie 2025年

作者： Minzhi Ma Yuanxing Fang Zeai Huang Sixin Wu Weiwei He Suxiang Ge Zhi Zheng Ying Zhou Wenjun Fa Xinchen Wang 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 Xuchang Henan 461000 China Department Key Lab for Special Functional Materials Ministry of Education National & Local Joint Engineering Research Center for High-Efficiency Display and Lighting Technology School of Materials Science and Engineering Collaborative Innovation Center of Nano Functional Materials and Applications Henan University Kaifeng Henan 475004 China State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University Fuzhou Fujian 350116 China State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation School of New Energy and Materials Southwest Petroleum University Chengdu Sichuan 610500 China

Photo-/electro-catalytic CO 2 reduction with H 2 O to produce fuels and chemicals offers a dual solution to address both environmental and energy challenges. For a long time, catalyst design in this reaction system has primarily focused on optimizing reduction sites to improve the efficiency or guide the reaction pathway of the CO 2 reduction half-reaction. However, less attention has been paid to designing activation sites for H 2 O to modulate the H 2 O dissociation half-reaction. Impressively, the rate-determining step in overall CO 2 reduction is the latter, and it influences the evolution direction and formation energy of carbon-containing intermediates through the proton-coupled electron transfer process. Herein, we summarize the mechanism of the H 2 O dissociation half-reaction in modulating CO 2 reduction performance based on cutting-edge research. These analyses aim to uncover the potential regulatory mechanisms by which H 2 O activation influences CO 2 reduction pathways and conversion efficiency, and to establish a mechanism-structure-performance relationship that can guide the design and development of high-efficiency catalytic materials. A summary of advanced characterization techniques for investigating the dissociation mechanism of H 2 O is presented. We also discuss the challenges and offer perspectives on the future design of activation sites to improve the performance of photo-/electro-catalytic CO 2 reduction.

关键词： H2O oxidation/activation Proton/electron-feeding Rate-determining step Reduction of CO2 Reverse reaction Water hydrogen bond network

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Synergistic coupling of bipolar membrane electrodialysis and Fenton process for sustainable management of landfill leachate reverse osmosis concentrate

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Chemical engineering Journal 2025年 516卷

作者： Hao-Ran Yang Changjiang Li Chiqian Zhang Xiaohong Lan Xinfei Dong Yi-Hong Jiang Yu-Ming Zheng Zhi-Hua Yuan CAS Key Laboratory of Urban Pollutant Conversion Institute of Urban Environment Chinese Academy of Sciences Xiamen 361021 China College of Life Sciences Fujian Agriculture and Forestry University Fuzhou 350002 China University of Chinese Academy of Sciences Beijing 100049 China National and Local Joint Engineering Research Center for Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan Province Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650093 China College of Engineering & Computer Science Arkansas State University Jonesboro 72467 USA

Landfill leachate reverse osmosis concentrate (LLRC) substantially challenges wastewater treatment because of the inhibition effects of inorganic ions and refractory organic compounds. This study integrated bipolar membrane electrodialysis (BMED) and Fenton oxidation for effective LLRC management. The BMED process had high desalination efficiency of 89.9 % and chloride (Cl − ) removal of 97.1 %. Furthermore, the BMED process produced 0.38 mol/L of acids and 0.37 mol/L of bases, demonstrating its ability to recover inorganic salts and create an optimal environment for Fenton oxidation. The subsequent Fenton oxidation reduced the concentration of the refractory organic compounds to 35 mg/L of COD in the effluent. Cumulatively, the BMED-Fenton process achieved a 92.5 % COD reduction from LLRC. Modeling identifies 1000–1500 mg/L as the optimal operational Cl − concentrations for the Fenton oxidation, in which range the oxidation is most effectively enhanced. Economic analysis revealed that the cost of the BMED-Fenton system treating LLRC is $4.76/m 3 , underscoring its financial viability. The study also elucidated the pathways for transforming complex, toxic organic compounds to simpler, less toxic forms. This research provides a theoretical framework for resource recovery and compliant discharge of LLRC, offering an economical, practical, and sustainable management solution for high-salinity organic wastewater.

关键词： Desalination

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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...

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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

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A New Strategy to Improve the Thermal Stability of (Sr, Ba)2sio4: Eu2+ Phosphors by Ion Substitution engineering

SSRN

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SSRN 2022年

作者： Liu, Zhengqiang Seto, Takatoshi Tian, Houdao Wang, Yuhua National and Local Joint Engineering Laboratory for Optical Conversion Materials and Technology of National Development and Reform Commission School of Materials and Energy Lanzhou University Lanzhou730000 China

With high quantum efficiency and appropriate excitation & emission wavelength, (Sr, Ba)2SiO4: Eu2+ phosphors exhibit perfect photoluminescence properties in the room temperature. However, limited by its poor thermal stability, they are difficult to be applicated in the high-performance lighting and display fields. In this work, we propose a new strategy of ion substitution engineering to greatly improve the thermal stability of (Sr, Ba)2SiO4: Eu2+ phosphors. Through the conventional high-temperature solid-state reaction, we successfully introduced alkali metal ions K+/Na+ into the SrBaSiO4 host lattice, thereby strengthening its structural rigidity, and improving the luminous intensity and narrowing the Full-Width Half-Maximum (FWHM) of the phosphors. The substitution of K+/Na+ ions can also deepen the traps in the phosphor, which proved by the thermoluminescence (TL) measurement. joint effect of the stronger crystal rigidity and deeper traps leads to a higher thermal stability, and the emission intensity at 150 °C can reach to 81.5% of the room temperature with Na+ substitution, which is significantly better than the commercial SrBaSiO4: Eu2+ phosphor. The mechanism of alkali metal ions improving thermal stability is explained reasonably through the photoionization and trap compensation. This new strategy makes it possible for (Sr, Ba)2SiO4: Eu2+ phosphors to be wider applicated in the high-performance WLED devices. © 2022, The Authors. All rights reserved.

关键词： Phosphors

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