MATERIALS RESEARCH BULLETIN
·
2015
·
IF 2.288
Zhiyong Mao,Jingjing Chen,Liang Sun,Qifei Lu,Dajian Wang
(Ba,Sr) 3 MgSi 2 O 8 :Eu 2+ , Mn 2+ phosphors with 430/505/660 nm tri-bands or 430/660 nm dual-bands emission were demonstrated in this work by controlling the appearence or not of green emitting intermediate phases, (Ba,Sr) 2 SiO 4 :Eu 2+ . Through varying the stoichiometric amount of SiO 2 in precursor, the coexistence of green emitting intermediate phase tended to be sensitive and diversified. Laser Microzone Raman spectrum was employed to look insight into the lattice stretch and the preferential occupation sites of Ba 2+ ions in Sr 3 MgSi 2 O 8 lattices. The local structure and the crystal field of Eu 2+ luminescent centers were found to be disturbed by distorted arrangement of cross-linked [MgO 6 ] octahedra and [SiO 4 ] tetrahedra. This mechanism approach provided some new insights to further understanding the adjustment strategy of green emitting intermediate phases in (Ba,Sr) 3 MgSi 2 O 8 :Eu 2+ , Mn 2+ phosphor potentially applied as red/blue dual-bands emitting or red/green/blue tri-bands emitting materials.
研究领域:
材料科学
·
无机化学
·
发光材料
·
固体物理
·
光电子学
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DOI
高影响因子
Materials Advances
·
2022
·Vol. 3
·期 15
·6171-6178
·
IF 0
Mingsheng Cai,Tianchun Lang,Tao Han,Damir Valiev,Shuangqiang Fang,Houjiang You,Bitao Liu,Ling Du,Zichao Xu,Elena F. Polisadova
Investigating narrow-band green emitting phosphors with high efficiency and good thermal stability is the main goal of the present light-emitting diode (LED) display research. Here, Ba1−xCaxScO2F:0.001Bi3+,0.001K+ (x = 0–0.12) perovskite phosphors, emitting narrow green light excited by a 415 nm chip, were developed using the cation substitution design strategy. The effects of Ca2+ substitution for Ba2+ in the Ba1−xCaxScO2F:0.001Bi3+,0.001K+ crystal structures and photoluminescence properties were investigated. All the phosphors show the cubic perovskite-type structure in the space group Pm3m. The evolution of the cell parameters and the Ba/Ca/K/Bi–O bond lengths were evaluated. The phosphors with the internal quantum efficiency of 77.4% exhibit bright green emission peaking at 510 nm under 415 nm chip excitation. The improvement of luminescence efficiency and thermal stability was discussed in detail in relation to the local structure variation. The cation substitution design strategy mentioned here can become an important approach to realize the spectral modulation through controlling the micro-environment in the lattice for excellent LED backlight displays.
研究领域:
材料科学
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光学工程
·
无机化学
·
固体物理
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显示技术
✓ 已验证
DOI
Journal of Materials Research and Technology-JMR&T
·
2026
·
IF 7.3
Min Zhu,Xiaonan Chen,Danan Ma,Zhiping Wan,Hongyu Cao,Jiacheng Cao,Peiqing La
Oxide materials are promising for thermoelectric applications due to their high thermal and chemical stability at elevated temperatures. However, their efficiency is often limited by low electrical conductivity and high thermal conductivity, stemming from simpler structures compared to complex intermetallic compounds. In this study, two novel high-entropy strontium barium niobate oxides, (Sr 0.17 Ba 0.17 La 0.17 Eu 0.17 K 0.17 Na 0.17 )Nb 2 O 6-δ and (Sr 0.17 Ba 0.17 La 0.17 Eu 0.17 K 0.17 Pb 0.17 )Nb 2 O 6-δ , were designed using high-entropy engineering. XRD confirmed the formation of a tungsten bronze structure, while SEM and EDS showed dense microstructures and uniform elemental distribution. The materials exhibit low thermal conductivity—below 1.8 W·m -1 ·K -1 from 323 to 1073 K—indicating strong thermal insulation. At 923 K, (Sr 0.17 Ba 0.17 La 0.17 Eu 0.17 K 0.17 Na 0.17 )Nb 2 O 6-δ achieves a peak power factor of 349.30 μW·m -1 ·K -2 , leading to a ZT of 0.22 at 1073 K. This improvement results from enhanced electron transport and phonon scattering enabled by high-entropy design.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lingxi Lei,Lei Li,Jielei Tu,Delin Xu,Zhican Ba,Jian Yu,Shengyao Huang,Hong Luo,Jiahui Hou,Lingfu Kong,Xibo Du,Jiancheng Cui
The rare-earth down-shifting (Sr,Ba) 2 SiO 4 :Eu 2+ (SBSE) material can convert ultraviolet light into visible light, reduce the damage caused by ultraviolet light to solar cells, and improve the efficiency of solar cells. In this study, by mixing the rare-earth down-shifting (Sr,Ba) 2 SiO 4 :Eu 2+ material with ethylene vinyl acetate and encapsulating solar cells, the competitive relationship between light conversion and scattering by rare-earth down-shifting materials in ethylene vinyl acetate and its effect on solar cell power were revealed. And its reliability was verified through experiments. The experimental results showed that the dominant factor influencing the optical properties of ethylene vinyl acetate changes with SBSE concentration. At concentrations of 0.25–0.5 wt%, the scattering of light by SBSE is dominant. At concentrations of 0.5–1 wt%, the down-shifting conversion of light by SBSE is dominant. When the concentration of SBSE increases to 1.5 wt% concentration, SBSE agglomerates, and the scattering of light by SBSE is dominant once again. Photovoltaic modules were fabricated for external quantum efficiency (EQE) and electrical property tests. The photovoltaic module EQE was affected by the changes in the optical properties of the SBSE-EVA. The performance of the photovoltaic modules prepared using SBSE materials first worsened, then improved, and then worsened again with increasing SBSE concentration. Among the tested conditions, 1 wt% was the best SBSE concentration, resulting in an EQE improvement of 2.916 %. The maximum power, short-circuit current, open-circuit voltage, and fill factor of the SBSE module increased by 1.82 %, 2.044 %, 1.791 %, and 0.069 %, respectively.
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 20
·7839-7845
·
IF 3.069
Kun Chai,Shichao Cheng,Hongyi Li,Bin Dai
A new phosphate fluoride, Rb2CaPO4F, was synthesized from a high temperature solution. Single-crystal X-ray diffraction analysis indicates that Rb2CaPO4F belongs to the Pnma space group of the orthorhombic system. It exhibits an intricate three dimensional (3D) framework that consists of 1D infinite zig-zag [FRb2Ca]∞ chains interlinked by isolated PO4 tetrahedra. The 1D chains are composed of plane-sharing F-centered [FRb4Ca2] octahedra. Meanwhile, we also obtained another phosphate fluoride K2CaPO4F, which is isostructural with Rb2CaPO4F. Moreover, the effect of the cation size on the framework structures of A2CaPO4F (A = K, Rb) and K2BaPO4F is discussed in detail. In addition, the UV-Vis-NIR diffuse reflectance spectra and the infrared spectra were measured to determine their cut-off edge and the anionic group, respectively. The first-principles theoretical studies were also conducted to aid in the understanding of the electronic structures and linear optical properties.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xinyu Liu,Taotao Ai,Xinyu Chen,Qin Li,Qian Qiu,Ying Zheng,Yuan Zhou,Haikui Song,Kun Yu,Chunlin Song,Haibo Zhang,Gang Liu,Yan Yan
In recent years, lead-free Bi 0.5 Na 0.5 TiO 3 (BNT) based piezoelectric ceramics with excellent strain properties have gained widespread recognition for their application in high-precision displacement actuators. The (1- x )(0.82Bi 0.5 Na 0.5 TiO 3 -0.18K 0.5 Bi 0.5 TiO 3 )- x Ba(Fe 0.5 Sb 0.5 )O 3 ceramics were fabricated through the die-pressing method in this work. The effect of BFS introduction on the dielectric, ferroelectric and microstructure characteristics of BNKT ceramics was systematically investigated. Among these compositions, the BNKT-0.015BFS ceramics exhibited a piezoelectric strain coefficient ( d 33 *) of 658 pm/V at an electric field of 55 kV/cm, while achieving a strain response of 0.51 % at 85 kV/cm. The observed improvement in strain performance can be attributed to the evolution from non-ergodic relaxor state to ergodic relaxor state caused by BFS substitution. Furthermore, transmission electron microscopy (TEM) explicitly confirmed coexistence of rhombohedral and tetragonal phase and revealed the morphology of nanosized domains. This study adds to a deeper comprehension of the characteristics of strain response enhancement in BNT-based ceramics, opening up avenues for designing novel lead-free piezoelectric ceramics with outstanding electromechanical performance.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2024
·Vol. 171
·期 5
·050534
·
IF 3.1
Yi Zou,Yaozhong Chen,Tao Jiang,Songxue Shao,Mingjing Xiao,Yuetong Lv,Yuting Wang,Lvjin Gao,Li Chen,Wentao Zhao
It is popular to choose the cubic phase Li7La3Zr2O12(c-LLZO) to synthesize the PEO-based complex membrane in all-solid-state battery. In this work, Ba/Nb elements were selected to achieve Li6.75La3Zr1.75Nb0.25O12 (LLZNO) and Li7La2.75Ba0.25Zr1.75Nb0.25O12 (LLBZNO) with high ion conductivity, which effectively enhance the electrochemical properties of the complex solid membrane and the all-solid-state battery. The higher ion mobility of LLBZNO compared to that of LLZNO and LLZO is calculated by ab-initio molecular dynamics (AIMD) simulation and further confirmed by experiments. Results show that the cubic phase of LLBZNO is more stable than that of LLZNO. The complex membrane of LLBZNO@ polyethylene oxide (PEO) (CPE-2-x wt%) exhibits the better electrochemical properties than LLZNO@PEO (CPE-1-x wt%) complex membrane. In detail, the CPE-2–10 wt% has the outstanding lithium transfer number ({t}_{{{Li}}^{+}}) of 0.63, as well as the excellent compatibility with lithium metal anode. In addition, at 0.1 mAcm−2, the lithium/CPE-2–10 wt%/lithium symmetric cell remains stable after 1000 h. It is LLBZNO that makes LLBZNO@PEO composite polymer electrolyte(CPE) the potential for the application in all-solid-state lithium battery.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Yingqing Zhao,Rui Liu,Christian Marcus Pedersen,Zhenzhou Zhang,Zhaohui Guo,Honghong Chang,Yingxiong Wang,Yan Qiao
Lactic acid (2-hydroxypropionic acid, LA) can be produced from abundant and renewable biomass resources via chemocatalytic processes, which exhibited high potential for meeting its tremendous demand in a wide range of applications. The basic Ba(OH) 2 could efficiently catalyze the conversion of d -glucose into LA. In the present study, by utilizing various NMR techniques including, chemical shift titration, 2D diffusion ordered spectroscopy (DOSY) analysis, heteronuclear singular quantum correlation ( 1 H– 13 C HSQC), the binding sites and catalytic interaction between d -glucose and catalyst were clarified. The experimental results by NMR and electrospray ionization mass spectrometry (ESI–MS) were used to explore the reaction mechanism. Experimental results disclosed that the catalyst, Ba(OH) 2 , may exist in the form of [Ba(OH)(H 2 O) 2 ] + under the reaction condition. The OH – of [Ba(OH)(H 2 O) 2 ] + is attached to the C5-O of d -glucose, and Ba 2+ is connected to the C1-O of d -glucose. Herein, we suppose that Ba(OH) 2 and d -glucose interact and form a complex, d -glucopyranose-[Ba(OH)(D 2 O) 2 ] + . Furthermore, when the reaction was performed in D 2 O, we were surprised to find that LA underwent varying degrees of deuteration. The reaction mechanism, binding sites and deuteration of the product have shed light on the efficient conversion of biomass to LA.
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产品关联
DOI
高影响因子
Micro & Nano Letters
·
2022
·Vol. 17
·期 4
·77-85
·
IF 0.98
Jia-Shu Tu,Shao-Wen Zhang,Hong-An Ying,Wei-Wen Hong,Dan Chen
Presented is a new heterometallic compound, namely [Cd 2 Ba 2 (pdc) 4 (H 2 O) 4 (DMA) 2 ]} n · n (H 2 O) ( 1 , H 2 pdc = terephthalic acid, DMA is N , N ′-dimethylacetamide), which was created with the solvothermal reaction. The architectural analysis of X-ray indicated that the 1 reveals a three-dimensional skeleton according to one-dimensional infinite chains. After removal of the free along with coordinated solvent molecules, it contains 49.8% solvent-accessible volume and unsaturated coordination sites. The solvent-free form of 1 exhibits excellent catalytic effect for the addition reaction between diethylzinc and benzaldehyde. Its therapeutic effect and mechanism exploration on diabetes was conducted in this present research. Firstly, the abundance of intestinal flora in the gut was detected with real time RT-PCR assay. Besides, the measurement of the levels of sugar was conducted with blood glucose meter in the T2DM animal after compound treatment. The cytotoxicity of the 1 was evaluated with CCK-8 assay.
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DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 21
·6666
·
IF 3.623
Xingru Zhang,Yinan Xiao,Beining Du,Yueming Li,Yuandong Wu,Liyuan Sheng,Wenchang Tan
The characteristic transition from ferroelectric (FE) to ergodic relaxor (ER) state in (Bi0.5Na0.5)TiO3(BNT) based lead-free ceramics provides an efficient approach to bring a highly ordered phase back to a disordered one. It would be rational to utilize this transition to improve relevant non-piezoelectric properties based on domain decomposition. In this work, different La contents were introduced to 0.93(Bi0.5Na0.5)TiO3-0.07Ba(Ti0.945Zr0.055)O3ceramics (BNT-BZT-xLa) to induce evolution of ergodic degree. The results reveal that with increasing La content, both the FE-ER transition temperatureTF-Rand depolarization temperatureTdshift towards room temperature, implying a deepened ergodic degree. By modulation of ergodic degree, thermally stimulated depolarization current experiment shows a higher current density peak, and corresponding pyroelectric coefficient increases from 2.46 to 2.81 μC/(cm2∙°C) atTd. For refrigeration, the indirect measurement demonstrates the ΔTmaximum increases from 1.1 K to 1.4 K, indicating an enhanced electrocaloric effect. Moreover, the optimized energy storage effect is observed after La doping. With appearance of “slimmer”P-Eloops, both calculated recoverable energy storage densityWrecand storage efficiencyηincrease to 0.23 J/cm3and 22.8%, respectively. These results denote La doping conduces to the improvement of non-piezoelectric properties of BNT-based ceramics in a certain range. Therefore, La doping should be an adopted modification strategy for lead-free ceramics used in areas like refrigerator and pulse capacitors.Keywords:BNT-based lead-free ceramics;electric properties;ferroelectric to ergodic relaxor state transition;La doping
研究领域:
材料科学
·
电子工程
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DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Dongjie Liu,Xiaohan Yun,Peipei Dang,Hongzhou Lian,Mengmeng Shang,Guogang Li,Jun Lin
Recently, there has been growing interest in developing Bi3+-activated luminescence materials for optoelectronic applications. Herein, new yellow/orange-emitting ABZn2Ga2O7:Bi3+ (ABZGO, A = Ca, Sr; B = Ba, Sr) phosphors with tunable optical properties are synthesized by an alkaline earth cation substitution. When Sr2+ substitutes Ca2+ and Ba2+, the excitation wavelength has a red shift from 325 to 363 nm, matching well with the n-UV chip based white light-emitting diodes (WLEDs). CaBaZn2Ga2O7:0.01Bi3+ (CBZGO:0.01Bi3+) exhibits two evident emission peaks at 570 and 393 nm originating from the respective occupation of Ca and Ba sites by Bi3+ ions. The optical tuning of the CBZGO:Bi3+ phosphor is achieved by changing the Bi3+ doping content and excitation wavelength based on the selected site occupation. Differently, both SrBaZn2Ga2O7:0.01Bi3+ (SBZGO:0.01Bi3+) and Sr2Zn2Ga2O7:0.01Bi3+ (SZGO:0.01Bi3+) phosphors exhibit a single broad emission band, peaking at 600 and 577 nm, respectively. Two different Bi3+ sites are also verified respectively in SBZGO and SZGO hosts by the Gaussian fitting of the asymmetric PL spectra and lifetime analysis. The different luminescence behaviors of ABZGO:0.01Bi3+ phosphors should be ascribed to the synergistic effect of the centroid shift, crystal-field splitting, and Stokes shift. Moreover, the temperature-dependent PL spectra reveal that cation substitutions of Sr2+ for Ca2+ and Ba2+ can efficiently improve the thermal stability of ABZGO:0.01Bi3+ phosphors. In view of different thermal responses to various temperatures for two emission peaks of the CBZGO:0.01Bi3+ phosphor, an optical thermometer is designed and has a good relative sensitivity (Sr = 1.453% K–1) at 298 K. Finally, a WLED with CRI = 97.9 and CCT = 3932 K is obtained by combining SZGO:0.01Bi3+ and BAM:Eu2+ phosphors with a 370 nm n-UV chip, demonstrating that SZGO:0.01Bi3+ is an excellent yellow-orange-emitting phosphor for n-UV WLED devices. This work stimulates the exploration of optical tuning by cation substitution to obtain remarkable luminescence materials for optical temperature sensing and WLED applications.
研究领域:
材料科学
·
光电子学
·
发光与荧光粉
·
固态照明
·
温度传感
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Chao Dou,Shengqiang Liu,Fangyi Zhao,Zhen Song,Quanlin Liu
The discovery of violet-excitable blue-emitting phosphor is a significant breakthrough for the development of phosphor-converted full-spectrum white light-emitting diodes (WLEDs). However, the application of most known violet-excitable blue-emitting phosphors is limited by their low external quantum efficiency (EQE). In this work, we reported on how the EQE values of Eu2+-doped Ba(K)-β-Al2O3 blue-emitting phosphor can be significantly improved through lattice site engineering. By partially substituting K+ for Ba2+, the Eu2+-occupied crystallographic site changes and the coordination polyhedron of Eu2+ shrinks, leading to the increase of crystal field splitting. Consequently, the excitation spectrum exhibits a continuous red shift to match the violet excitation, which enhances the PL intensity of solid solution phosphor (Ba0.4K1.6)0.84Al22O35−α:0.32Eu2+ ((B0.4K1.6)0.84AO:Eu) by 1.42 times compared to that of the end-member Ba1.68Al22O35−α:0.32Eu2+ (B1.68AO:Eu) phosphor. Correspondingly, under the 400 nm violet light excitation, the EQE of optimal blue-emitting (B0.4K1.6)0.84AO:Eu phosphor is up to 53%. Additionally, the phosphor also shows excellent resistance to luminescence thermal quenching (95% at 150 °C). Finally, the WLED fabricated based on (B0.4K1.6)0.84AO:Eu and commercial green and red phosphors exhibited an ultra-high color rending index with Ra = 95.5 and R1–R15 >90. This work offers guidance for tuning the spectral properties of phosphors through lattice site engineering.
研究领域:
材料科学
·
光子学
·
固态照明
·
发光材料
·
光电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）