Ceramics International最新文献

{"title":"Electrical contact performances of Ag-SnO2(CuO)/Cu-SnO2(CuO) heterogeneous materials prepared by hot-press sintering","authors":"Wenjie Feng ,&nbsp;Huanchong Lu ,&nbsp;Guijing Li","doi":"10.1016/j.ceramint.2025.01.507","DOIUrl":"10.1016/j.ceramint.2025.01.507","url":null,"abstract":"<div><div>New Ag-SnO₂(CuO)/Cu-SnO₂(CuO) heterogeneous materials (HMs) were prepared by a powder metallurgy method for use as high-performance and low-cost electrical contacts. The Ag-SnO₂(CuO) components of the HMs was used as contacts and the Cu-SnO₂(CuO) components served as conductors. The electrical contact properties of the HMs were tested and analyzed. The results showed that vacuum hot-press sintering near the Ag-Cu eutectic point temperature could suppress the aggregation of SnO₂ particles at the Ag/Cu interface and enhance the interfacial bond strength of the HMs. The Ag-SnO₂(CuO)/Cu-SnO₂(CuO) HMs exhibited excellent electrical contact properties compared with that of a conventional Ag-SnO₂(CuO) composite material. In particular, the welding force of the HM contacts was about 1 cN, which was much lower than that of the Ag-SnO₂(CuO) contacts. The HM contacts showed low and stable contact resistance in the range of 6–20 mΩ. In contrast, when the Cu-SnO₂(CuO) components in the HMs acted as electrical contacts, the contact resistance sharply increased to about 0.3 MΩ after 27 operations due to the oxidation of Cu in air, an increase of millions or even tens of millions of times. Through comparative analysis, it was inferred that the excellent electrical contact properties of the Ag-SnO₂(CuO)/Cu-SnO₂(CuO) HMs were mainly attributed to the good arc dispersion effect and oxidation resistance.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17341-17354"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation and dielectric properties of Al2O3-based ceramic composites with Sm2O3 and ZrO2 additives for terahertz applications","authors":"Kagan Murat Purlu ,&nbsp;Sekip Dalgac ,&nbsp;Elif Isik ,&nbsp;Betul Kafkaslioglu Yildiz ,&nbsp;Kholoud Elmabruk","doi":"10.1016/j.ceramint.2025.01.544","DOIUrl":"10.1016/j.ceramint.2025.01.544","url":null,"abstract":"<div><div>As Terahertz (THz) electromagnetic waves become significant for industrial applications, the choice and electrical characterization of materials play important roles in improving system efficiency. Due to their unique properties, ceramics have recently become increasingly explored for THz applications. To this end, the samples of Al₂O₃-based ceramic composites with Sm₂O₃ and ZrO₂ additives are prepared. The prepared ceramic composites are characterized utilizing THz time-domain spectroscopy (THz-TDS), a powerful analytical technique employing THz radiation. First, the impact of sintering temperature on the dielectric properties of the pure Al₂O₃ is examined. Thus, the sintering temperature is set at 1550 °C to fabricate the other composites. Moreover, the impact of ZrO₂, Sm₂O₃ and ZrO₂-Sm₂O₃ additives on the dielectric properties of Al₂O₃-based ceramic composites is examined. In this context, the refractive index, permittivity, absorption coefficient and loss tangent of Al₂O₃-based ceramic composites are studied. Accordingly, it is observed that the dielectric constant and refractive indices of composites containing ZrO₂, Sm₂O₃ and ZrO₂-Sm₂O₃ additives increase compared to the pure-Al₂O₃. Moreover, while the loss tangent decreases with Sm₂O₃ additives, ZrO₂, and ZrO₂-Sm₂O₃ additives cause a rise in the loss tangent. The presented results enable us not only to choose the proper composite but also to enhance the dielectric properties of Al₂O₃-based ceramics. Consequently, they pave the way for the use of Al₂O₃-based ceramic composites with Sm₂O₃ and ZrO₂ additives in a wide range of THz applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17744-17754"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrasonic sprayed hollow ceramic/carbon microspheres function as thermal insulation, ablative resistance, and electromagnetic shielding materials","authors":"Chuhui Qin ,&nbsp;Hangyu Zhong ,&nbsp;Hongli Hu ,&nbsp;Zhonglei Kang ,&nbsp;Bo-xing Zhang","doi":"10.1016/j.ceramint.2025.01.579","DOIUrl":"10.1016/j.ceramint.2025.01.579","url":null,"abstract":"<div><div>Hollow ceramic/carbon microspheres (HCCMs) have widespread applications for thermal insulation and ablative resistance materials in aerospace areas, attributed to their multiple advantages such as low density, low thermal conductivity, oxidation and high-temperature resistance. In this work, we fabricated HCCMs with diameters around 18–242 μm by the ultrasonic spray method, using mixed solutions of poly(acrylonitrile) (PAN), polyvinyl pyrrolidone (PVP), and preceramic polymers as starting materials. After optimizing the morphology of HCCMs, we introduced them as fillers into phenolic resin (PR). By adjusting the ratio between HCCMs and PR, the optimal properties were obtained at a loading content of 30 wt% of HCCMs. The density of as-obtained PR composite was 0.70 g/cm³, the thermal conductivity was 0.27 W/(m·K), and the maximum electromagnetic shielding effectiveness was 76.30 dB at the frequency of 8–12 GHz. This work develops a powerful approach to fabricating HCCMs, and demonstrates their typical application as fillers in PR to improve thermal insulation, electromagnetic shielding, and ablative resistance performance.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 18029-18037"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical properties and high-frequency (K-band) microwave absorption performance of CoFe2O4@Bi2/3Cu3Ti4O12@Graphene composite","authors":"A. Magaji ,&nbsp;M.D. Nurhafizah ,&nbsp;D. Basandrai","doi":"10.1016/j.ceramint.2025.01.582","DOIUrl":"10.1016/j.ceramint.2025.01.582","url":null,"abstract":"<div><div>Electromagnetic pollution has been on the rise due to advancement in electronics. This type of pollution could affect the operation of electronic devices and may causes radiation related disease. The sol-gel auto-combustion method was used to prepare CoFe₂O₄ and Bi_2/3Cu₃Ti₄O₁₂ whereas mechanical blending was used to prepare CoFe₂O₄@Bi_2/3Cu₃Ti₄O₁₂@graphene composite. The XRD analysis affirm the purity of the prepared samples which was later confirmed by FTIR analysis. The presence of Bi_2/3Cu₃Ti₄O₁₂ and graphene resulted in the reduction of the magnetic interaction which is supported by VSM analysis and the plot of <span><math><mrow><msup><mi>μ</mi><mo>′</mo></msup></mrow></math></span> and <span><math><mrow><msup><mi>μ</mi><mo>″</mo></msup></mrow></math></span>. CoFe₂O₄@Bi_2/3Cu₃Ti₄O₁₂@graphene composite possesses the lowest value of <span><math><mrow><msub><mi>E</mi><mi>g</mi></msub></mrow></math></span> (3.76 eV). The magnetic parameters of CoFe₂O₄ tend to decrease with the addition of Bi_2/3Cu₃Ti₄O₁₂ and graphene. The sample CoFe₂O₄@Bi_2/3Cu₃Ti₄O₁₂@graphene composite shows the least <span><math><mrow><mi>R</mi><mi>L</mi></mrow></math></span> of <span><math><mrow><mo>−</mo></mrow></math></span> 25.73 dB for an absorber thickness of 2.00 mm at a frequency of 21.59 dB with 3.00 bandwidth of effective absorption. The results demonstrate the possibility of applying CoFe₂O₄@Bi_2/3Cu₃Ti₄O₁₂@graphene composite as an efficient microwave absorber.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 18056-18072"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923204","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structure network topology and broadband 2.7 μm luminescence in Er3+/Pr3+ co-doped TeO2-BaF2-YF3 glass","authors":"Zihao Shao ,&nbsp;Yuerong Bai ,&nbsp;Dechun Zhou ,&nbsp;Zhuang Leng ,&nbsp;Kexuan Han ,&nbsp;Fengjie Qin","doi":"10.1016/j.ceramint.2025.01.584","DOIUrl":"10.1016/j.ceramint.2025.01.584","url":null,"abstract":"<div><div>In this paper, Er³⁺/Pr³⁺ co-doped tellurite fluoride glass samples were prepared by high-temperature melting method, and the structural and optical properties of the glass samples were investigated and discussed by Raman spectroscopy, DSC mapping, absorption spectroscopy, and fluorescence spectroscopy with a view to obtaining a gain medium with good luminescence performance for the 2.7 μm band. The results of Raman spectroscopy show that the glass has a maximum phonon energy of 755 cm⁻¹. The lower maximum phonon energy is attributed to the introduction of F⁻, which leads to the breakage of the Te-O-Te bond in the structure and the formation of two kinds of bonds, O-Te-F and Te-F-Te, which makes the structure of TeO₄ gradually transformed into TeO₃₊₁ and TeO₃, and the fluoride–tellurite crystal system presents two phases of oxyfluoride (TeO₃F₂ and TeOF₂) based on the formation of α and β TeO₂ polymorphs. On the other hand, the change of structure network topology effectively inhibits the interaction between rare earth ions and reduces their nonradiative transitions probabilities, which provides a powerful environment for the mid-infrared band luminescence thus enhancing the infrared luminescence performance. The DSC pattern shows that the glass has a T_g of 355 °C and a ΔT as high as 118 °C, which suggests that the glass has a good thermal stability. The fluorescence spectra show that when the doping concentration of Er₂O₃/PrF₃ is 1 mol% and 2 mol%, the maximum fluorescence intensity of 2.7 μm is acquired. The fluorescence half-height width of the glass is 138 nm, and the effective fluorescence bandwidth of the glass is <span><math><mrow><mo>Δ</mo><msub><mi>λ</mi><mrow><mi>e</mi><mi>f</mi><mi>f</mi></mrow></msub></mrow></math></span> = 147.4 nm, which is a sufficient guarantee for the realization of the tunable laser of 2.7 μm with a wide <span><math><mrow><mo>Δ</mo><msub><mi>λ</mi><mrow><mi>e</mi><mi>f</mi><mi>f</mi></mrow></msub></mrow></math></span>. The Judd-Ofelt intensity parameters were calculated by combining the absorption spectra, where the Ω₂,Ω₄,Ω₆, and spectral quality factor (χ = Ω₄/Ω₆) of the glass were 6.83 × 10⁻²⁰ cm², 2.49 × 10⁻²⁰ cm²,1.78 × 10⁻²⁰ cm², and 1.40, respectively. Meanwhile, the emission cross-section reached 6.37 × 10⁻²¹ cm², with maximum gain coefficients of 2.28 cm⁻¹, indicating that the glass sample has a low lasing threshold and is expected to produce efficient 2.7 μm luminescence. The results indicate that the Er³⁺/Pr³⁺ co-doped 70TeO₂-20BaF₂-10YF₃ glass is a promising laser glass material in the 2.7 μm band.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 18086-18094"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"3D hollow microsphere Fe3O4@Bi0/OVs-Bi2O2CO3 composite photocatalyst with magnetic separation for photocatalytic degradation of aniline aeroflot in mineral processing wastewater","authors":"Yong Huang ,&nbsp;Tao Ding ,&nbsp;Mianping Zheng ,&nbsp;Yiran Hu ,&nbsp;Xuanyi Wu ,&nbsp;Xiaofang Zhang","doi":"10.1016/j.ceramint.2025.01.585","DOIUrl":"10.1016/j.ceramint.2025.01.585","url":null,"abstract":"<div><div>In this study, three-dimensional (3D) hollow Bi⁰/OVs-Bi₂O₂CO₃ was prepared by solvothermal method using carbon nanospheres (CSs) as a sacrificial template and N, N-dimethyl formamide (DMF) as a solvent, and then 3D Fe₃O₄@Bi⁰/OVs-Bi₂O₂CO₃ photocatalytic materials were obtained by co-precipitation method. The structure, morphology, optical properties and magnetic separation properties of the prepared photocatalysts were characterized. The results of magnetic separation experiments showed that the 3D Fe₃O₄@Bi⁰/OVs-Bi₂O₂CO₃ photocatalytic materials were easily dispersed in aqueous solution and could be separated by an applied magnetic field. Under Xenon lamp irradiation, the degradation rate of aniline aeroflot (AAF) over S3 sample reached 94.51 % in 120 min with a degradation rate constant of 0.0225 min⁻¹, which was 4.59 times higher than that of the reference sample. The enhanced photocatalytic performance of the 3D Fe₃O₄@Bi⁰/OVs-Bi₂O₂CO₃ photocatalytic material originates from the surface plasmon resonance (SPR) effect of Bi⁰ and the promotion of the photogenerated carrier transfer ability by Fe₃O₄ and oxygen vacancies (OVs), which suppresses the recombination of photogenerated electrons and holes. Based on experimental observations, a mechanism for the enhanced photocatalytic performance of 3D Fe₃O₄@Bi⁰/OVs-Bi₂O₂CO₃ photocatalytic materials was proposed.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 18095-18108"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The thermal stability of Er2O3 anti-reflective films deposited on CVD diamond by magnetron sputtering","authors":"Yabo Huang ,&nbsp;Xia Zhao ,&nbsp;Xiaohua Zhu ,&nbsp;Shengji Liu ,&nbsp;Xulei Wang ,&nbsp;Yuehan Yue ,&nbsp;Weishuai Sun ,&nbsp;Pei Wang ,&nbsp;Xiaoqin Guo ,&nbsp;Chengming Li","doi":"10.1016/j.ceramint.2025.01.530","DOIUrl":"10.1016/j.ceramint.2025.01.530","url":null,"abstract":"<div><div>Erbium oxide (Er₂O₃) films with excellent thermal and optical performance are essential for application as heat-resistant and anti-reflective (AR) materials in chemical vapor deposition (CVD) diamond infrared windows. In this study, the thermal stability of Er₂O₃ AR films was investigated by heat treatment. The phase composition, microstructure, thermogravimetric analysis, mechanical properties, and infrared (IR) transmission performances of the Er₂O₃ AR films were thoroughly investigated. The results show that the cubic (222) plane orientation of the Er₂O₃ AR films after heat treatment was preferential to that at room temperature. No significant change was observed in the DSC and TG curve at the temperature varied, but the DSC curve of the Er₂O₃ AR films revealed two distinct stages at 502 °C and 798 °C owing to the formation of Er₂O₃ (420) and (134) planes. Specifically, the phase structure remained unchanged by high-resolution transmission electron microscope (HRTEM) observation, and the peak at 578.4 cm⁻¹ was the only obvious impurity peak in the Raman spectrum owing to the introduction of the Er–O bond. Additionally, significant shedding of the Er₂O₃ AR films on the surface of the CVD diamond occurred at high temperatures. The grain size and roughness increased as the temperature increased, adversely affecting the continuous abrasion resistance of the Er₂O₃ AR films. Moreover, the Er₂O₃ AR films exhibited outstanding mechanical and optical properties at 800 °C, achieving a depth of only 0.65 μm and a maximum transmittance increased from 65 % of diamond to 76 %. This study provides valuable insights into the thermal stability of the Er₂O₃ AR films under high temperature application scenarios.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17568-17574"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ferroelectric polarization improved photoelectrochemical properties of cerium-doped barium titanate-based coaxial nanorod arrays","authors":"Lingchun Lu,&nbsp;Yang Yang,&nbsp;Hongbo Ji,&nbsp;Qingshan Lu","doi":"10.1016/j.ceramint.2025.01.531","DOIUrl":"10.1016/j.ceramint.2025.01.531","url":null,"abstract":"<div><div>The coupling of semiconductors with ferroelectrics provides a strategy to modulate the photoelectrochemical properties which greatly influences the photocatalysis performance. Cerium-doped barium titanate-based coaxial nanorod arrays (TiO₂/Ba_1-<em>x</em>Ce_<em>x</em>TiO₃/TiO₂) are designed and fabricated through the introduction of Ba_1-<em>x</em>Ce_<em>x</em>TiO₃ nanolayer between the internal rutile TiO₂ nanorod and the outermost anatase TiO₂ film. The TiO₂/Ba_1-<em>x</em>Ce_<em>x</em>TiO₃/TiO₂ nanorods exhibit an average length of 339 nm and a diameter of 66 nm. A piezoelectric coefficient <em>d</em>₃₃ of 437.5 p.m./V is achieved at the Ce doping concentration of 0.06. The improved photocurrent response and electrochemical impedance of TiO₂/Ba_0.94Ce_0.06TiO₃/TiO₂ are attributed to ferroelectric polarization induced by lattice distortion owing to Ce doping. After positive poling at 3 V, the photocurrent response is increased to the 1.27 times of the initial value. The uniform orientation of ferroelectric domains under electric field results in the increased polarization intensity, which promotes the separation and migration of the photogenerated carriers, yielding the improved photoelectrochemical properties.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17575-17582"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Expansion of the stability range of the CaCu3Ti4O12 (CCTO) ceramics through Co-substitution with Sc3+/Zr4+","authors":"Ilyas Jalafi,&nbsp;Fatima Chaou,&nbsp;Karim Chourti,&nbsp;Mohamed Chokri,&nbsp;Wassima EL Hadouchi,&nbsp;El Hassan Yahakoub,&nbsp;Amine Bendahhou,&nbsp;Soufian EL Barkany,&nbsp;Mohamed Abou-Salama","doi":"10.1016/j.ceramint.2025.01.527","DOIUrl":"10.1016/j.ceramint.2025.01.527","url":null,"abstract":"<div><div>This study examines the effects of Sc³⁺ and Zr⁴⁺ ions on the dielectric properties of CaCu₃Ti₄O₁₂ (CCTO) ceramics. Samples with the composition Ca_(1-x)Sc_2x/3Cu₃Ti_3.97Zr_0.03O₁₂ (x = 0.025, 0.05, 0.075) were synthesized via the classical ceramic method. XRD confirmed the primary CCTO phase with minor secondary phases, while SEM revealed reduced grain sizes in doped samples. Dielectric measurements showed high dielectric constants (ε' &gt; 5 × 10³) across a wide frequency range and low dielectric losses. The x = 0.05 sample exhibited superior performance, with minimal dielectric loss (tanδ = 0.012 at 20 °C) and stable dielectric properties (Δε' ≤ ±15 %), ideal for X9R-type capacitors. These results align with the internal barrier layer capacitor (IBLC) model, highlighting the potential of doped CCTO for advanced capacitor applications.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17547-17556"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Double perovskite Sr2GdTaO6: Tm3+ blue phosphors: Luminescence properties, optical transition and white LED application","authors":"Li Wang ,&nbsp;Yuhang Zhang ,&nbsp;Xuezhu Sha ,&nbsp;Xin Chen ,&nbsp;Jinsu Zhang ,&nbsp;Xizhen Zhang ,&nbsp;Yongze Cao ,&nbsp;Yichao Wang ,&nbsp;Xiangping Li ,&nbsp;Sai Xu ,&nbsp;Hongquan Yu ,&nbsp;Baojiu Chen","doi":"10.1016/j.ceramint.2025.01.511","DOIUrl":"10.1016/j.ceramint.2025.01.511","url":null,"abstract":"<div><div>To explore blue phosphors excited by near ultraviolet light for applications in white light-emitting diodes, a series of double perovskite Sr₂GdTaO₆ (SGT) powders doped with Tm³⁺ were synthesized by a high-temperature solid-state method. The samples’ crystal structure, luminescent properties, fluorescence dynamic, luminescent thermal stability, and optical transition properties were all thoroughly investigated. Under 360 nm excitation, both the narrowband emission from Tm³⁺ ions and the broadband emission from host were simultaneously observed. The strongest emission of narrowband was observed at 2 mol% Tm³⁺ doping concentration. An electric dipole-dipole interaction mechanism among Tm³⁺ ions was identified to be responsible for the concentration quenching process of the narrowband emission. The chromaticity coordinates and color purity for the SGT: 2 mol% Tm³⁺ sample were determined to be (0.19, 0.15) and 74.3 %, respectively, which fell into the blue region. Moreover, the luminescence intensity for blue emission retained 92.5 % of its room temperature intensity even at 423 K, thus indicating good luminescent thermal stability. Optical transition properties of Tm³⁺ ions in SGT were evaluated with the aid of Judd-Ofelt theory, based on the diffuse reflectance spectra and the decay of ¹D₂ level. In addition, the blue-emitting SGT: Tm³⁺ phosphor was used to demonstrate a light-emitting diode prototype that emits a full spectrum warm white light, characterized by a chromaticity coordinate of (0.33, 0.33), a low correlated color temperature of 5750 K, and an impressive color rendering index of 96.8. These findings suggest that this efficient blue-emitting phosphor holds promise for application in white light-emitting diodes.</div></div>","PeriodicalId":267,"journal":{"name":"Ceramics International","volume":"51 13","pages":"Pages 17387-17397"},"PeriodicalIF":5.1,"publicationDate":"2025-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}