Article
Optics
Joydip Dutta, Mitesh Chakraborty, Vineet Kumar Rai
Summary: The structural, surface morphology, and optical properties of Er3+/Yb3+ doped zinc titanate phosphors have been studied using various techniques. The introduction of Yb3+ has significantly enhanced the upconversion emission intensity of the phosphors. Temperature sensing study has been demonstrated using the green UC emission bands.
Article
Chemistry, Physical
Yingzhu Zi, Zhengwen Yang, Zan Xu, Xue Bai, Asad Ullah, Imran Khan, Asif Ali Haider, Jianbei Qiu, Zhiguo Song, Yuehui Wang, Yangke Cun
Summary: In this study, upconversion luminescence of rare earth ions in negative and positive thermal expansion hosts was investigated for temperature sensing applications. The results showed that the luminescence behavior varied with temperature, offering potential for novel temperature sensing devices using a mixed phosphor approach.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Inorganic & Nuclear
K. Naveen Kumar, Gumin Kang, Jiseok Lim, Jungwook Choi
Summary: Non-cytotoxic upconversion nanocrystals based on Yb3+/Er3+:La-2(WO4)(3) have demonstrated exceptional advantages for optical thermometry and bioimaging/biomedical applications, with significantly enhanced upconversion emission achieved by co-doping with Yb3+ /Er3+. The potential of these nanocrystals in various strategic applications, such as upconversion lasers, optical thermometry, and biomedical and anticancer applications, has been highlighted.
INORGANIC CHEMISTRY
(2022)
Article
Spectroscopy
Jia Zhang, Songsong An, Yining Zhang, Yamei Zhang
Summary: A series of novel LS:Er3+,Yb3+ luminescent materials were successfully synthesized and their upconversion luminescence properties and temperature-sensing performance were systematically investigated. The study found that the optimal Yb3+ concentration in LS:1%Er3+,xYb(3+) was x=15%, and the LS:Er3+,Yb3+ material exhibited good reversibility and repeatability.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Materials Science, Ceramics
Lei Li, Yongze Cao, Hongqiang Cui, Yuhang Zhang, Guojian Li, Yichao Wang, Xiangping Li, Sai Xu, Baojiu Chen
Summary: In this study, a series of Na0.5Bi2.5Nb2-xTaxO9:Er3+/Yb3+ upconversion luminescence (UL) phosphors with different co-doping concentrations were prepared by solid-state sintering method. The lattice structure and UL properties were investigated, and it was found that the UL color of the phosphors can be adjusted by varying the concentration of co-doped Ta5+. The sensitivity of the phosphors to temperature was studied using luminescence intensity ratio technique, and the results suggest that they have potential applications as temperature sensing materials.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Optics
Shanshan Peng, Fengqin Lai, Zongliang Xiao, Hao Cheng, Zhong Jiang, Weixiong You
Summary: Ba2LaNbO6:Er3+/Yb3+ phosphor demonstrates excellent upconversion luminescence and temperature sensing behavior, serving as a potential alternative for temperature sensing applications.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Multidisciplinary
Lu Zheng, Xinyi Huang, Jiuping Zhong, Zijun Wang, Xiaoning Cheng
Summary: This study investigated the effects of a SiO2 shell coating on the optical properties and thermal sensitivity of core-shell UCNPs, revealing that the SiO2 coating can significantly enhance the temperature sensitivity. The research also found that analyzing the fluorescence intensity ratio of non-thermally coupled levels can lead to even higher temperature sensitivity in certain conditions.
Article
Engineering, Electrical & Electronic
Yongqiang Wang, Xingbang Dong, Huanjun Zhang, Xiaobo Deng, Xuerui Cheng
Summary: The beta-BiNbO4:Er3+/Yb3+ upconversion phosphors synthesized using the solid-state method exhibit strong green emission and relatively weak red emission. These phosphors show potential application as temperature sensing materials, especially at high temperatures.
JOURNAL OF ELECTRONIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Bo Hu, Huawei Zhang, Liren He, Dongli Wang
Summary: In this study, Er3+/Yb3+-doped orthorhombic-phase BiNbO4 phosphors were synthesized and investigated as optical temperature sensors. The optimal doping concentrations were determined to be 3 mol.% Er3+ and 15 mol.% Yb3+. The material showed maximum absolute sensitivity (S-a) of 5.51‰/K at 415 K and relative sensitivity (S-r) of 3.7%/K at 150 K using the fluorescence intensity ratio technique.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Optics
Angela Enachi, Octavian Toma, Serban Georgescu
Summary: The study investigated luminescent centers in Er:Yb:CaSc2O4 and observed two distinct centers, with one dominating at low temperatures, while the population of the other center increased with doping concentrations. This study also explored the Stark energy levels for both centers and discussed the temperature dependence of upconversion intensity.
JOURNAL OF LUMINESCENCE
(2021)
Article
Materials Science, Ceramics
Hongqiang Cui, Yongze Cao, Lei Zhang, Ying Li, Yuhang Zhang, Lei Li, Jinsu Zhang, Baojiu Chen
Summary: A series of Er3+/Yb3+ co-doped Cs3GdGe3O9 (CGG) phosphors were prepared and their microstructure and upconversion luminescence properties were studied. Abnormal phenomena were observed, including continuously increasing upconversion luminescence intensity under 980 nm laser irradiation and thermal enhancement. The phenomenon is attributed to electron releasing of host defects. CGG:Er3+/Yb3+ phosphors exhibit temperature-dependent upconversion luminescence, with a significant increase in intensity at higher temperatures. The maximum absolute sensitivity and relative sensitivity of the samples were calculated, and it was found that CGG:Er3+/Yb3+ phosphors can be used as a high-temperature optical thermometer.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Qingran Wang, Hao Wu, Liangliang Zhang, Huajun Wu, Yongshi Luo, Guohui Pan, Zhendong Hao, Quanquan Mu, Jiahua Zhang
Summary: Er3+ and Yb3+ codoped Gd2Mo4O15 upconversion phosphors were synthesized and studied for their luminescent properties and temperature sensing behaviors. The results indicate that Gd2Mo4O15 is a promising green upconversion phosphor for optical thermometry.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Kamel Saidi, Christian Hernandez-Alvarez, Marcin Runowski, Mohamed Dammak, Inocencio Rafael Martin Benenzuela
Summary: Highly sensitive Er3+-doped sensor nanophosphors have been developed for temperature and pressure sensing. These materials are based on thermally coupled energy levels and show higher sensitivity compared to traditional materials.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Zhehan Zhang, Xiaochen Yu, Xinqi Xue, Boyang Gao, Youru Bai, Hanbo Yang, Xiaojie Li, Jibin Fan, Peng Zhao
Summary: Herein, K3ScF6 upconversion luminescence (UCL) phosphors codoped with fixed Er3+, Yb3+ and various Bi3+-concentrations were prepared, and their upconversion emission properties and temperature sensing performance were investigated. The results showed that tridoping with Bi3+ ions can enhance the upconversion emission intensity, and changes in Bi3+ concentration and power density can achieve color tunability and CCT value changes. Therefore, these phosphors have potential applications in non-contact optical temperature sensors and color tunable devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
F. Rivera-Lopez, M. E. Torres, G. Gil de Cos
Summary: This paper discusses the frequency upconversion and cooperative luminescence in a BO3:Yb3+-Er3+ sample, where red, green, and blue emissions were observed under laser excitation. Mechanisms of energy transfer upconversion and excited-state absorption were proposed to explain the radiative transitions, with a focus on the color purity of the sample presented through a color diagram.
MATERIALS TODAY COMMUNICATIONS
(2021)
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)