Article
Chemistry, Analytical
Fan Chen, Muhammad Nadeem Akram, Xuyuan Chen
Summary: In order to address the extended electron lifetime and suboptimal thermal stability of trivalent europium ion (Eu3+)-doped zinc molybdate (ZnMoO4) as red phosphors in solid-state lighting (SSL), we propose a co-doping approach by incorporating Mn2+ and Eu3+ in ZnMoO4 to improve thermal reversibility and reduce the lifetime of electron transitions. The introduction of Mn2+ remarkably improves the thermal stability and reversibility of the phosphors, although it leads to a decrease in quantum efficiency and electron lifetime. This co-doping strategy presents a promising avenue for expanding the application possibilities of phosphor materials in high-power SSL applications subjected to elevated temperatures.
Article
Materials Science, Multidisciplinary
Jingming Chan, Lina Cao, Zhe Xu, Xiaoyong Huang
Summary: Efficient cyan-green-emitting phosphors are developed based on the solid-solution design of chemical cation substitution for near-ultraviolet-excited white light-emitting diodes (LEDs). The improved quantum efficiency and thermal stability of the phosphors make them suitable for high-quality full-visible-spectrum LED lighting.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Inorganic & Nuclear
Yue Wang, Kexin Zhao, Bohuai Shao, Chuang Wang, Ge Zhu
Summary: In this study, we achieved non-concentration quenching doping of Eu3+ ions in Sr9Y2-2xW4O24:xEu3+ phosphor, which effectively suppressed energy migration and cross-relaxation and resulted in high quantum efficiency and color purity. The prepared phosphor showed high thermal tolerance and excellent performance, indicating potential applications in various fields.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Duan Gao, Yunci Li, Lihong Cheng, Shengyi Liu, Sai Xu, Xiangping Li, Jinsu Zhang, Xizhen Zhang, Yongze Cao, Yichao Wang, Xin Wang, Yuhang Zhang, Xuezhu Sha, Li Wang, Baojiu Chen
Summary: This study investigated the effects of Dy3+ concentration on the fluorescence intensity and optical transition properties of rare earth doped luminescence materials. It was found that the optical properties and fluorescence intensity varied with increasing Dy3+ concentration, with changes observed in the Omega values and Judd-Ofelt parameters. The internal quantum efficiency of F-4(9/2) was also found to decrease with higher Dy3+ concentrations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Environmental
Xiangli Wu, Rou Shi, Jilin Zhang, Dawei Wen, Zhongxian Qiu, Xinguo Zhang, Wenli Zhou, Liping Yu, Shixun Lian
Summary: A highly efficient and zero-thermal quenching blue-emitting phosphor has been discovered, with internal and external quantum efficiencies of 97.1% and 61.8%, respectively, and exhibiting zero-thermal-quenching behavior within 150 degrees C. The relationship between thermal stability and quantum efficiency of the phosphor was discussed.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Ceramics
Di Wu, Jiayong Si, Guodong Xie, Junben Huang, Gemei Cai
Summary: A new phosphor with broadband and blue emission has been successfully synthesized in this report, which exhibits appropriate spectral resemblance, thermal stability, and chromaticity stability, as well as higher internal quantum efficiency. This phosphor has the potential for applications in solid-state lighting and plant growth.
CERAMICS INTERNATIONAL
(2023)
Review
Optics
Xinhe Chen, Kaiyang Li, Jia Guo, Yubo Feng, Yi Zhu, Wen Chen, Mengjie Liu, Jie Shen, Yungang Lu, Xu Qian, Bo Wei, Quan Liu
Summary: Phosphors with excellent thermal stability have experienced significant growth in the field of solid state lighting in recent years. A novel complex perovskite phosphor Na1/2La1/2Mg1/3Nb2/3O3:Eu3+ with high thermal stability was prepared by optimizing the concentration of luminescence center. This complex perovskite exhibits a double-order structure, A-site layered order and B-site 1:2 order. Increasing the concentration of Eu3+ does not lead to concentration quenching behavior. Temperature-dependent emission spectra were used to explore the thermal stability, and the representative Na0.5Eu0.5Mg0.333Nb0.667O3 phosphor showed increased emission intensity at higher temperatures. Temperature-dependent decay curves and X-ray diffraction confirmed its excellent stability at high temperature. This complex perovskite red phosphor holds great potential for solid state lighting applications.
JOURNAL OF LUMINESCENCE
(2023)
Article
Optics
Wei Li, Nan Ma, Balaji Devakumar, Xiaoyong Huang
Summary: This study presents a new efficient blue-light-excited Ce3+-doped CaY2HfScAl3O12 green phosphor with broad emission bandwidth and high quantum efficiency. The potential application of this phosphor in fabrication of full-spectrum LED lighting is demonstrated.
JOURNAL OF LUMINESCENCE
(2023)
Article
Chemistry, Physical
Tingxuan Yang, Zhihong Ma, Saifang Huang, Ting Zhang, Kai Zhao, Li Yin, Qinfen Gu, Peng Cao
Summary: The phosphor reported in this study exhibits ultra-narrow emission band, high quantum efficiency, and excellent thermal stability, making it suitable for high-power lighting and backlight display applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Xiaoyong Huang, Zhe Xu, Balaji Devakumar
Summary: This paper reports on the preparation, crystal structure, and photoluminescence properties of a novel green-emitting garnet-type phosphor. It was found that the optimal doping concentration of Ce3+ ions is 6 mol%. The synthesized phosphor exhibits high thermal stability and high photoluminescence performance, making it promising for application in high color rendering white LEDs.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Lei Kang, Hongwei Wang, Xiaoshuang Li, Jiangcong Zhou
Summary: In this study, a Ce3+ doped phosphor Ba2LuAl3Si2O12:Ce3+ was successfully designed and obtained, with investigations on its photoluminescence emission properties and concentration quenching effects. By introducing Mn2+ ions, the orange emission band was significantly enhanced for application in high-quality warm white LEDs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Biochemistry & Molecular Biology
Fan Chen, Muhammad Nadeem Akram, Xuyuan Chen
Summary: In this study, trivalent europium-doped tungstate and molybdate samples were synthesized using an improved sol-gel and high-temperature solid-state reaction method. The effects of W/Mo ratios and calcination temperatures on the crystal structure and photoluminescence characteristics were investigated. It was found that the doping concentration of 50% europium yielded the best quantum efficiency. The crystal structure depended on the W/Mo ratio and calcination temperature, and the photoluminescence behavior correlated with crystal structure and grain size.
Article
Chemistry, Inorganic & Nuclear
Yongbiao Hua, Kailian Zhou, Xiaobing Wang, Xiuzhen Qiu
Summary: A series of Sm3+ and Eu3+ single-doped CaSrSb2O7 phosphors were successfully synthesized via a high-temperature solid state method, and color-tunable properties could be achieved by adjusting doping concentration and temperatures.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Chao Dou, Chuxin Cai, Zhen Song, Quanlin Liu
Summary: By partially replacing Al3+ with Ga3+, the photoluminescence intensity, internal/external quantum efficiency, and thermal stability of NIR phosphors are improved, resulting in a high electro-optical efficiency for NIR pc-LED devices.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Jiaxing Zuo, Wendong Nie, Yan Li, Huangshi Xie, Jiaju Gao, Wenlong Lai, Xing Li, Jiaqing Peng, Xinyu Ye
Summary: A novel Cs2NaGaF6: Cr3+ NIR fluoride phosphor with a unique anti-fluorescence quenching effect is developed by integrating the structural confinement effect with weak electron-phonon coupling effect. The phosphor exhibits a wide emission band and high internal quantum efficiency, showing potential applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)