Ceramics International最新文献_第8页

Elucidating thermal decomposition mechanism of barium titanyl oxalate tetrahydrate and a stepwise calcination protocol for tailoring high-tetragonality BaTiO3 nanopowders 研究了四水合草酸钛钡的热分解机理及制备高四方性纳米BaTiO3粉体的分步煅烧工艺

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.183

Yunfei Yan , Haixia Zhang , Junrong Yue , Yu Guan , Lei Shao

The oxalate precipitation method is widely employed for the synthesis of barium titanate (BaTiO₃) due to its advantages in precise control of stoichiometric ratio and particle size. However, the calcination process in this method significantly influences the morphology, particle size, and phase transition behavior of the final BaTiO₃ powder. Therefore, In this study, the thermal decomposition mechanism of barium titanyl oxalate tetrahydrate was systematically investigated using coupled thermogravimetry–mass spectrometry–gas chromatography, X-ray diffraction, and fourier transform infrared spectroscopy. The reaction pathways for each decomposition stage were validated through quantitative analysis of mass loss in relation to the proposed reaction stoichiometry. Based on these findings, a multi-step calcination strategy was proposed for the first time. The results indicate that the thermal decomposition of barium titanyl oxalate tetrahydrate proceeds through four distinct stages: (1) removal of crystalline water; (2) thermal decomposition of barium titanyl oxalate; (3) formation of an intermediate product, barium carbonate; and (4) conversion into BaTiO₃ through further decomposition. a four-step calcination process was employed to successfully prepare tetragonal-phase BaTiO₃ with an average particle size of 176 nm, a tetragonality (c/a) of 1.0099. Compared to direct calcination, this stepwise approach reduced the required calcination temperature by 100 °C and decreased the average particle size by 197 nm. Furthermore, a five-step calcination process resulted in an even smaller average particle size of 136 nm, although with a slightly reduced tetragonality of 1.0092. These findings demonstrate that the stepwise calcination strategy enables the synthesis of highly tetragonal BaTiO₃ at lower temperatures. This provides a viable technical pathway for producing BaTiO₃ with fine particles and high phase purity, showing significant application potential in the field of high-performance electronic ceramic materials.

草酸盐沉淀法由于具有精确控制化学计量比和粒度的优点，被广泛应用于钛酸钡的合成。然而，该方法的煅烧过程对最终BaTiO3粉末的形貌、粒度和相变行为有显著影响。因此，本研究采用热重-质谱-气相色谱、x射线衍射和傅里叶变换红外光谱等方法对四水草酸钛钡的热分解机理进行了系统的研究。每个分解阶段的反应途径通过与所提出的反应化学计量学相关的质量损失的定量分析进行了验证。在此基础上，首次提出了多步焙烧策略。结果表明：四水草酸钛钡的热分解过程分为四个不同的阶段：(1)去除结晶水；(2)草酸钛钡热分解；(3)形成中间产物碳酸钡；(4)进一步分解转化为BaTiO3。采用四步煅烧工艺成功制备了平均粒径为176 nm、正方度（c/a）为1.0099的四方相BaTiO3。与直接煅烧相比，该方法可将煅烧温度降低100℃，平均粒径降低197 nm。此外，五步煅烧工艺的平均颗粒尺寸更小，为136 nm，尽管四方性略有降低，为1.0092。这些发现表明，逐步煅烧策略可以在较低温度下合成高度四方的BaTiO3。这为制备颗粒细、相纯度高的BaTiO3提供了可行的技术途径，在高性能电子陶瓷材料领域具有重要的应用潜力。

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引用次数: 0

Luminescence performance and thermoluminescence of a new long afterglow phosphor Na2Ca2-xCexSc2Si3O12 for AC-LED applications 用于交流led的新型长余辉荧光粉Na2Ca2-xCexSc2Si3O12的发光性能和热释光性能

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.008

Weicheng Zheng, Junwen Yu, Fangyin Zhu, Chunyu Wang, Meiling Chen, Fangyan Luo, Zhengye Xiong, Jingyuan Guo

With the wide adoption of blue-light chips, the demand for blue-light-excited long afterglow phosphors is increasing, and the current long afterglow phosphors excited by blue light exhibit relatively low afterglow brightness. In this study, a novel long afterglow phosphor, Na₂Ca_2-xCe_xSc₂Si₃O₁₂ (0.0025 ≤ x ≤ 0.08) phosphor, was prepared by a high-temperature solid-state method, and it was found that the increase in Ce³⁺ concentration led to the enhancement of crystal field splitting as well as the substitution of Ca²⁺ by Ce³⁺, which in turn led to the spectral redshift. In addition, as the temperature rises, the emission intensity value of this phosphor at 450 K decreases to 69.39 % of that at 300 K with an activation energy ΔE_q = 0.3445 eV/K. Therefore, this phosphor material has a better thermal stability, which makes it more suitable for AC-LED lighting applications. Finally, analysis of the thermoluminescence curves by first-order kinetic fitting and the initial rise method yielded a trap depth of Na₂Ca_2-0.02Ce_0.02Sc₂Si₃O₁₂ is about 0.73 eV for the temperature of 300 K–380 K. The afterglow mechanism makes the flickering rate of Na₂Ca_2-0.02Ce_0.02Sc₂Si₃O₁₂ AC-LED reduced by 67.67 %, indicating that the phosphor material has strong potential for AC-LED applications.

随着蓝光芯片的广泛采用，对蓝光激发长余辉荧光粉的需求不断增加，而目前蓝光激发的长余辉荧光粉的余辉亮度相对较低。本研究采用高温固相法制备了一种新型的长余光荧光粉Na2Ca2-xCexSc2Si3O12（0.0025≤x≤0.08）荧光粉，发现Ce3+浓度的增加导致晶体场分裂增强，并导致Ca2+被Ce3+取代，从而导致光谱红移。此外，随着温度的升高，该荧光粉在450 K时的发射强度值下降到300 K时的69.39%，活化能ΔEq = 0.3445 eV/K。因此，这种荧光粉材料具有更好的热稳定性，这使得它更适合于交流led照明应用。最后，通过一阶动力学拟合和初始上升法对热释光曲线进行分析，得出在300 K - 380 K温度下，Na2Ca2-0.02Ce0.02Sc2Si3O12的俘获深度约为0.73 eV。余辉机制使Na2Ca2-0.02Ce0.02Sc2Si3O12交流led的闪烁率降低了67.67%，表明该荧光粉材料具有很强的交流led应用潜力。

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引用次数: 0

Ethylene glycol sensor with ppb-level detection limit prepared by covering layer catalyzed the sensitive layer SmFeO3 采用覆盖层催化敏感层SmFeO3制备ppb级检出限的乙二醇传感器

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.10.462

Qianqian Zhang , Lanlan Huang , Yicheng Geng , Xiaobin Liu , Weidong Zhu , Xiaqing Zhang , Danni Liu

For colorless, odorless and difficult to detect low concentration ethylene glycol (EG). In this paper, a two-layer sensing structure consisting of a sensitive layer and a catalytic covering layer is proposed, the concept is successfully applied to the research work of EG sensor. The sensitive layer of SmFeO₃ nanotube was synthesized by electrospinning, In₂O₃ nanospheres are covered with a catalytic layer by hydrothermal method. The SmFeO₃/In₂O₃ double-layer sensor with high performance and real-time measurement has been successfully prepared. The sensor has an ultra-high response and ultra-low detection limit, at an optimal temperature of 220 °C, 30 °C lower than the SmFeO₃ pure sample. Successfully detected 100 ppb EG and detected a response value of 64 to 50 ppm EG, it is 2∼3 times that of pure SmFeO₃. The two-layer sensing mechanism and the successful construction of n-p heterojunction, the increase of specific surface area, the particle size is reduced and the carrier transport efficiency is improved. The stability of SmFeO₃/In₂O₃ sensor material is also greatly enhanced by constructing a double-layer sensor structure. This study establishes a foundation for enhancing the gas-sensitive characteristics of perovskite materials through the application of catalytic layers, it provides research ideas for the effective detection of ultra-low concentration gas sensors.

用于无色、无味、难检测的低浓度乙二醇（EG）。本文提出了一种由敏感层和催化覆盖层组成的两层传感结构，并将该概念成功地应用于EG传感器的研究工作中。采用静电纺丝法合成了SmFeO3纳米管的敏感层，并用水热法在纳米球表面覆盖一层催化层。成功制备了高性能、实时测量的SmFeO3/In2O3双层传感器。该传感器具有超高的响应和超低的检测限，最佳温度为220°C，比SmFeO3纯样品低30°C。成功检测到100 ppb EG，检测到64 ~ 50 ppm EG的响应值，是纯SmFeO3的2 ~ 3倍。两层传感机制和n-p异质结的成功构建，增加了比表面积，减小了粒径，提高了载流子输运效率。通过构建双层传感器结构，大大提高了SmFeO3/In2O3传感器材料的稳定性。本研究为通过催化层的应用增强钙钛矿材料的气敏特性奠定了基础，为超低浓度气体传感器的有效检测提供了研究思路。

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引用次数: 0

High-temperature wettability to slag of carbon nanotube modified MgO castable prepared by a chemical vapor deposition method 化学气相沉积法制备的碳纳米管改性MgO浇注料对炉渣的高温润湿性

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.10.463

Chao Qu , Xiaoyang Huang , Haijun Zhang , Yage Li , Shaowei Zhang

Conventional MgO castable can not meet the requirements of steel production due to its poor slag corrosion resistance. Thus, in this work, a 1 wt% carbon nanotubes modified MgO (1 wt%-CNTs/MgO) castable was successfully prepared through the catalytic pyrolysis of polyethylene (PE) powder via a chemical vapor deposition strategy, the effects of pyrolysis temperature, catalyst concentration and type, and PE powder dosage on the preparation of the modified castable samples were investigated. Among the catalysts tested, Ni showed the best performance, and the optimal preparation conditions for the 1 wt%-CNTs/MgO castable were a Ni concentration of 1.0 mol/L, a pyrolysis temperature of 973 K and a sample:PE powder mass ratio of 1:1. Moreover, the as-prepared 1 wt% CNTs/MgO sample exhibited a super-nonwetting property toward slag with a contact angle of 116° at 1723 K, and the corrosion depth of the sample was only 1092 μm, which was approximately 46 % lower than that of the control MgO castable sample.

常规氧化镁浇注料抗渣腐蚀性能差，已不能满足钢铁生产的要求。因此，本研究通过化学气相沉积法对聚乙烯（PE）粉末进行催化热解，成功制备了1 wt%碳纳米管修饰MgO （1 wt%-CNTs/MgO）浇注料，考察了热解温度、催化剂浓度和类型、PE粉用量对制备改性浇注料样品的影响。在所测试的催化剂中，Ni表现出最好的性能，制备1 wt%-CNTs/MgO浇注料的最佳条件是Ni浓度为1.0 mol/L，热解温度为973 K，样品与PE粉的质量比为1:1。此外，制备的1 wt% CNTs/MgO样品在1723 K时对炉渣表现出超不润湿性，接触角为116°，腐蚀深度仅为1092 μm，比对照MgO浇注样品的腐蚀深度低约46%。

引用次数: 0

Defect-engineered spintronic functionality via F-center exchange in quantum-confined ZnO/CuO heterostructures 量子限制ZnO/CuO异质结构中通过f中心交换的缺陷工程自旋电子功能

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.134

Mohammad Shahnawaze Ansari , Mohammad Omaish Ansari , Sana Ansari , Mohamed Sh. Abdel-wahab , Sajid Ali Ansari

The pursuit of energy-efficient spintronics demands materials with tunable magnetism and efficient spin transport at room temperature. This work demonstrates that precise nanoscale control over layer thickness in ceramic heterostructures provides a powerful pathway to achieve this goal. We fabricate ZnO/CuO heterostructures via radio frequency (RF) sputtering, systematically varying the CuO layer thickness from 20 to 80 nm on a 100 nm ZnO buffer. Comprehensive characterization reveals that increasing the CuO thickness acts as a primary lever to enhance the density of interfacial oxygen vacancies. This defect engineering, quantified by X-ray photoelectron spectroscopy (XPS), simultaneously orchestrates a dramatic improvement in both electrical and magnetic properties essential for spintronics. Resistivity increases by a factor of 5.2, while the saturation magnetization and coercivity are amplified to 7.11 emu/cm³ (+5.2 × ) and 68.79 Oe (+8.3 × ), respectively, at 300 K. We attribute this correlated enhancement to a synergistic mechanism where oxygen vacancies mediate d⁰ ferromagnetism via F-center exchange, promote carrier localization in quantum-confined CuO nanograins (4–6 nm), and enhance spin-orbit coupling at the strained interface. The 80 nm CuO heterostructure emerges as the optimal candidate, exhibiting high spin-conserving resistivity, robust room-temperature magnetic hysteresis, and a band structure conducive to Rashba effects. Our findings establish thickness-controlled defect engineering as a scalable and practical strategy for designing functional oxide spin valves, transforming interfacial vacancies from detrimental flaws into active components for voltage-tunable spintronic systems.

追求节能自旋电子学需要具有可调磁性和室温下有效自旋输运的材料。这项工作表明，精确的纳米级控制陶瓷异质结构层厚度为实现这一目标提供了强有力的途径。我们通过射频溅射（RF）制备ZnO/CuO异质结构，系统地在100 nm的ZnO缓冲层上改变CuO层厚度从20到80 nm。综合表征表明，增加CuO厚度是提高界面氧空位密度的主要杠杆。这种缺陷工程，通过x射线光电子能谱（XPS）量化，同时协调了自旋电子学所必需的电和磁特性的显着改善。电阻率增加了5.2倍，而饱和磁化强度和矫顽力在300 K时分别增加到7.11 emu/cm3 （+5.2 ×）和68.79 Oe （+8.3 ×）。我们将这种相关增强归因于一种协同机制，即氧空位通过f -中心交换介导0铁磁性，促进量子受限CuO纳米颗粒（4-6 nm）中的载流子局域化，并增强应变界面上的自旋轨道耦合。80 nm的CuO异质结构具有较高的自旋守恒电阻率、较强的室温磁滞特性和有利于Rashba效应的能带结构，是最佳的候选材料。我们的研究结果建立了厚度控制缺陷工程作为设计功能性氧化自旋阀的可扩展和实用策略，将有害缺陷的界面空缺转化为电压可调自旋电子系统的主动元件。

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引用次数: 0

Multi-scale enhanced DLP 3D printing proton-conducting ceramic electrolyte membranes for advanced fuel cells 用于先进燃料电池的多尺度增强DLP 3D打印质子导电陶瓷电解质膜

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.258

Mengyang Yu , Qiuxia Feng , Keqiang Fan , Jingjun Ren , Qiaolei Li , Xuefeng Zhu , Shenglong Mu

Digital light processing (DLP) 3D printing technology can be used to prepare high-precision defect-free electrolyte membranes with exceptional contact condition between layers, which is of great significance for the green manufacturing of high-performance Protonic Ceramic Fuel Cell (PCFC). However, traditional light curing is powerless to complex systems containing multiple light-absorbing materials, such as CeO₂, Yb₂O₃, and NiO. This study addresses the material system limitations and process control difficulties in the DLP 3D printing technology for PCFCs, and innovatively proposes a paste stabilization modification strategy, achieving precise molding of multi-component light-absorbing powder systems. An electrostatic-spatial synergy stabilization method was used to improve the rheological properties of the BaCe_0.7Zr_0.1Y_0.1Yb_0.1O_3-δ (BCZYYb) electrolyte slurry, solving the over-curing problem of the electrolyte slurry. The prepared PCFC shows excellent electrochemical performance, with a peak power density of 460 mW/cm² at 700 °C. This research achievement not only verifies the feasibility of preparing high-performance complex-structured PCFC devices by DLP 3D printing, but also provides an innovative solution for the green manufacturing of new energy devices.

利用数字光处理（DLP） 3D打印技术可以制备出具有优异层间接触条件的高精度无缺陷电解质膜，这对于高性能质子陶瓷燃料电池（PCFC）的绿色制造具有重要意义。然而，传统的光固化对于含有多种吸光材料（如CeO2， Yb2O3和NiO）的复杂体系无能为力。本研究针对pcfc DLP 3D打印技术的材料体系限制和工艺控制难点，创新性地提出了浆料稳定改性策略，实现了多组分吸光粉体体系的精密成型。采用静电-空间协同稳定化方法改善BaCe0.7Zr0.1Y0.1Yb0.1O3-δ (BCZYYb)电解质浆液的流变性能，解决了电解质浆液的过固化问题。制备的PCFC具有优异的电化学性能，在700℃下峰值功率密度为460 mW/cm2。该研究成果不仅验证了DLP 3D打印制备高性能复杂结构PCFC器件的可行性，也为新能源器件的绿色制造提供了创新解决方案。

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引用次数: 0

Dual approach of grain size reduction and Gd doping on modulating thermoelectric behaviour of CuO crystallites: Insight into high carrier mobility 晶粒尺寸减小和Gd掺杂调节CuO晶体热电行为的双重方法：对高载流子迁移率的洞察

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.219

K.V. Nabeela , P.P. Pradyumnan

In this work we comprehensively investigated the synergetic effect of nanostructering and Gd substitution on improving the thermoelectric properties of CuO, a scarcely examined oxide thermoelectric material. Nanostructured samples synthesised using ball milling technique exhibited significant grain refinement through grain size reduction. Modified band structure indicated by the reduction of density of state effective mass (m_d*) in nano crystallites of Gd doped CuO favoured for significantly improved carrier mobility of 219.60 ± 10 % cm²/Vs. Enhanced carrier mobility of this sample led to a maximum powerfactor of 9.6 μW/mK² at 873 K, 5-fold improvement over bulk CuO. Augmented phonon scattering from point defects and grain boundaries lead to a thermal conductivity of 0.90 W/mK at 873 K, ∼79 % reduction from bulk CuO. The novelty of dual method on concurrent improvement of electrical and thermal transport properties of CuO crystallites highlights the potentiality of modified CuO system for low grade heat harvesting applications.

在这项工作中，我们全面研究了纳米结构和Gd取代对改善CuO（一种很少被研究的氧化物热电材料）热电性能的协同作用。利用球磨技术合成的纳米结构样品通过减小晶粒尺寸表现出明显的晶粒细化。通过降低Gd掺杂CuO纳米晶的态有效质量密度（md*）来修饰能带结构有利于显著提高载流子迁移率（219.60±10% cm2/Vs）。该样品的载流子迁移率增强，在873 K下的最大功率因数为9.6 μW/mK2，比整体CuO提高了5倍。来自点缺陷和晶界的声子散射增强导致873 K时的导热系数为0.90 W/mK，比大块CuO降低了79%。同时改善CuO晶体电输运和热输运性质的双重方法的新颖性突出了改性CuO体系在低品位热收集应用中的潜力。

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引用次数: 0

Fabrication of Dy:Y2O3-MgO nanocomposite ceramics with high infrared transparency and Dy3+ ions concentration for mid-infrared laser applications 中红外激光用高红外透明度、高Dy3+浓度的Dy:Y2O3-MgO纳米复合陶瓷的制备

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.017

Haojie Mu , Xiaodong Li , Qi Zhu , Mu Zhang , Xudong Sun

The Y₂O₃-MgO nanocomposite ceramics, integrating the low phonon energy and high thermal conductivity, is a superior candidate for mid-infrared laser host materials. Moreover, Y₂O₃ exhibits substantial benefits for accommodating exceptionally high concentrations of Dy³⁺ activator ions. In this work,Y₂O₃-MgO ceramics doped with varying Dy³⁺ ions (0.5–12 at.%) were synthesized using the sol-gel and hot-pressing sintering to explore the impact of Dy³⁺ on the microstructure and properties. The calculation based on Van-de-Hulst theory allows us proportionally distinguish the effects of factors affecting transmittance across various wavelengths. The results indicate that the ceramics doped with high concentrations of Dy³⁺ ions exhibited obvious advantages in ⁶H_13/2 → ⁶H_15/2 energy level transition within the 2.7–3.1 μm. By optimizing the sintering process to suppress grain growth and eliminate pores, 12 at.% Dy: Y₂O₃-MgO achieved excellent mid-infrared transmittance of 82.8 %. High thermal conductivity Y₂O₃-MgO ceramics doped with high concentrations of Dy³⁺ active ions are highly promising as mid-infrared laser gain materials.

Y2O3-MgO纳米复合陶瓷具有低声子能量和高导热性能，是中红外激光宿主材料的理想选择。此外，Y2O3在容纳异常高浓度的Dy3+激活离子方面表现出实质性的好处。在这项工作中，Y2O3-MgO陶瓷掺杂不同的Dy3+离子（0.5-12 at）。采用溶胶-凝胶法和热压烧结法合成了Dy3+对其微观结构和性能的影响。基于Van-de-Hulst理论的计算使我们能够按比例区分影响不同波长透射率的因素的影响。结果表明：在2.7 ~ 3.1 μm范围内，掺杂高浓度Dy3+的陶瓷在6H13/2→6H15/2能级跃迁中表现出明显的优势；通过优化烧结工艺，抑制晶粒生长，消除气孔。% Dy: Y2O3-MgO的中红外透过率达到了82.8%。掺高浓度Dy3+活性离子的高导热Y2O3-MgO陶瓷是一种很有前途的中红外激光增益材料。

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引用次数: 0

LuAG:Ce PiGF @YAG TC@ CASN:Eu PiGF sandwich-structured color converter with high thermal stability and robust luminescence for high-power white LEDs and LDs LuAG:Ce PiGF @YAG TC@ CASN:Eu PiGF三明治结构颜色转换器，具有高热稳定性和强大的发光能力，适用于大功率白光led和ld

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.098

Yimo Zhao , Yuelong Ma , Xingyu Qi , Tao Pang , Shisheng Lin , Lili Lu , Linfeng Zhou , Jingyang Cui , Dongbin Xue , Guilu Wang , Daqin Chen

Color converters with excellent thermal stability and high luminescence quality are crucial for high-power white light-emitting diodes/laser diodes (LEDs/LDs). In this study, a sandwich-structured color converter was fabricated by sintering Lu₃Al₅O₁₂:Ce (LuAG:Ce) and CaAlSiN₃:Eu²⁺ (CASN:Eu) phosphor-in-glass films (PiGFs) on the top and bottom surfaces of a Y₃Al₅O₁₂ (YAG) transparent ceramic (TC) interlayer. The resulting composite exhibits exceptional thermal conductivity (7.058 W m⁻¹ K⁻¹) and thermal stability, retaining 87.55 % of its room-temperature luminescence intensity at 150 °C. Further, key parameters affecting the luminescence characteristics of the sandwich-structured color converters were systematically investigated, including CASN:Eu powder content, YAG TC interlayer thickness, and incident laser spot diameter. White LEDs, fabricated by integrating the optimized color converters with a 60 W 460 nm LED chip, produced bright white light with a CRI of 93.1 and a CCT of 5116 K. Under blue LD excitation, the as-prepared phosphor yielded white light with a LE of 84.10 lm/W, a CRI of 92.1, a CCT of 5591 K. As the YAG TC thickness increased, the surface temperature decreased from 132.5 °C to 113.2 °C and from 126.7 °C to 113.0 °C under blue LED and LD excitation, respectively. This architecture concurrently addresses the thermal-chromatic stability trade-off in high-power lighting devices, providing a scalable fabrication route for advanced color converters.

具有优异热稳定性和高发光质量的彩色变换器对于大功率白光发光二极管/激光二极管（led / ld）至关重要。在本研究中，通过在Y3Al5O12 （YAG）透明陶瓷（TC）中间层的上下表面烧结Lu3Al5O12:Ce （LuAG:Ce）和CaAlSiN3:Eu2+ (CASN:Eu)玻璃中磷膜（PiGFs），制备了三明治结构的颜色转换器。该复合材料表现出优异的导热性（7.058 W m−1 K−1）和热稳定性，在150℃时保持了87.55%的室温发光强度。此外，系统研究了影响三明治结构颜色转换器发光特性的关键参数，包括CASN:Eu粉末含量、YAG - TC层间厚度和入射激光光斑直径。将优化后的颜色转换器与60w 460 nm LED芯片集成，制备出明亮的白光，显色指数为93.1，CCT为5116 K。在蓝光LD激发下，制备的荧光粉产生白光，发光效率为84.10 lm/W，显色指数为92.1，CCT为5591 K。随着YAG TC厚度的增加，蓝色LED和LD激发下的表面温度分别从132.5℃降至113.2℃和从126.7℃降至113.0℃。该架构同时解决了高功率照明设备的热色稳定性权衡，为先进的颜色转换器提供了可扩展的制造路线。

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引用次数: 0

Dual engineering of oxygen vacancies and Bi metal on BiOCl nanosheets for synergistically enhancing far-red emission of Eu3+ BiOCl纳米片上氧空位和铋金属的双工程协同增强Eu3+的远红发射

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2025-12-01 DOI: 10.1016/j.ceramint.2025.11.151

Guofeng Zhang , Rui Hu , Yichao Wang , Sicheng Gao , Zhaoyi Yin , Zhiguo Song , Jianbei Qiu , Yongjin Li

Realizing efficient far-red luminescence (⁵D₀ → ⁷F₄ transitions) from Eu³⁺ ions in conventional hosts remains challenging due to the intrinsically limited energy transfer pathways. Herein, a novel dual-engineering strategy is proposed to synergistically increase the far-red emission of Eu³⁺ within BiOCl nanosheets by co-introducing plasmonic metallic Bi and oxygen vacancies (OVs). Metallic Bi nanoparticles and the OVs are simultaneously incorporated into BiOCl:Eu nanosheets via a tailored solvothermal method, followed by in situ reduction. The synergistic interplay between the OVs and localized surface plasmon resonance of Bi drastically enhances the excitation harvesting and efficiency of energy transfer to the Eu³⁺ activators. Consequently, the far-red emission intensity at 700 nm is remarkably enhanced 6.7-fold under 313 nm excitation, representing an unprecedented increase compared to that of pristine BiOCl:Eu. Furthermore, the precipitation of metallic Bi significantly enhances the thermal stability of the luminescence. This study provides fundamental insights into the synergistic plasmon-defect interactions within 2D semiconductors and establishes a promising pathway for use in developing high-performance far-red phosphors for application in advanced phosphor-converted white light-emitting diodes.

由于能量转移途径的有限性，实现Eu3+离子在传统宿主中的高效远红发光（5D0→7F4跃迁）仍然具有挑战性。本文提出了一种新的双工程策略，通过共同引入等离子体金属Bi和氧空位（OVs），协同增加BiOCl纳米片内Eu3+的远红发射。通过定制的溶剂热方法将金属铋纳米颗粒和OVs同时结合到BiOCl:Eu纳米片中，然后进行原位还原。OVs与Bi的局域表面等离子体共振之间的协同相互作用极大地提高了激发收获和能量转移到Eu3+激活剂的效率。因此，在313 nm激发下，700 nm处的远红发射强度显著提高了6.7倍，与原始BiOCl:Eu相比，这是前所未有的提高。此外，金属铋的析出显著提高了发光的热稳定性。该研究为二维半导体内的协同等离子体-缺陷相互作用提供了基本的见解，并为开发高性能远红色荧光粉用于先进的磷转换白光发光二极管建立了一条有希望的途径。

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引用次数: 0