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A novel Sr3Ga2Ge4O14:Dy phosphor: Tapping into the potential of dual-mode applications in white LEDs and optical thermometry

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Ceramics International 2025年第14期51卷 19535-19542页

作者： Wang, Ziyao Ma, Liya Shao, Yi Luo, Yuzhong Liao, Ruocong Kong, Ximing Yang, Xinyao Shenyang Key Laboratory of Micro-arc Oxidation Technology and Application Institute of Innovative Science and Technology Shenyang University Shenyang110044 China Ministry of Education Shenyang110044 China

A versatile Sr3Ga2Ge4O14:Dy3+ phosphor, exhibiting a classic multi-band emission spectrum stemming from the 4F9/2 to 6H15/2, 6H13/2, and 6H11/2 transitions of Dy3+ ions under ultraviolet excitation, is reported. This phosphor emits a warm white light and possesses exceptional thermal quenching resistance coupled with temperature-dependent chromatic stability. Notably, its 4F9/2-6H15/2 and 4I15/2-6H15/2 transitions, forming a thermally coupled level pair, exhibit opposing intensity variations with rising temperature. Leveraging this unique behavior, an optical thermometer based on the luminescence intensity ratio (LIR) between these two emissions has been devised, achieving a commendable relative sensitivity of 0.61%K−1 at 298 K. The combination of overall luminescence thermal stability and localized thermal sensitivity renders Sr3Ga2Ge4O14:Dy3+ an ideal candidate for direct integration into white LEDs, as well as for compensating spectral deficiencies in multicomponent white LED systems. Furthermore, its potential in constructing optical thermometers underscores its multifaceted functionality and innovative value. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Light emitting diodes

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Bright orange-yellow emission from lead-free double perovskite single crystals with an indirect band gap

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Ceramics International 2025年第9期51卷 11372-11377页

作者： Shi, Xianzhong Sun, Shifeng Mi, Ruiyu Wang, Ziyao Lin, Weiwei Wang, Baochen School of Chemical and Environmental Engineering Anhui Polytechnic University Wuhu241000 China Shenyang Key Laboratory of Micro-arc Oxidation Technology and Application Institute of Innovative Science and Technology Shenyang University Shenyang110044 China Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral Materials School of Materials Science and Technology China University of Geosciences Beijing100083 China

As a novel class of luminescent material, double perovskite still encounters the problem of low luminescence efficiency. Previous reports suggested that manipulating the band gap from indirect to direct, or breaking the inversion-symmetry-induced parity-forbidden transition, can lead to a dramatic increase in emission. Our study designs a series of Cs2AgBi1-xInxCl6 double perovskite single crystals. Notably, we observe over one hundredfold luminescence enhancement in Cs2AgBi0.2In0.8Cl6 with an indirect band gap. The absorption and photoluminescence spectra suggest that an appropriate Bi/In ratio opens radiative transition channels. Furthermore, the density functional theory calculation verifies that the significant luminescence improvement is attributed to the increase in transition matrix elements of the optimal Cs2AgBi0.2In0.8Cl6, which promotes radiative recombination of photo-induced charge carriers. These carries relax to the self-trapped exciton state, and result in strong emission. Our study demonstrates that in addition to band gap type and transition parity, the transition matrix element also accounts for the photoelectric performance of double perovskite, which should be taken into consideration when designing lead-free double perovskites for optoelectronic applications. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Single crystals

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High-Efficiency Degradation of Orange II by Co78Si8B14/g-C3N4 Composite Catalyst in a Visible-Light-Assisted Peroxymonosulfate Activation System

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Materials 2025年第8期18卷 1733页

作者： Yang, Zhenling Ma, Guofeng Zhang, Jun College of Environment Shenyang University Shenyang110044 China Shenyang Key Laboratory of Micro-Arc Oxidation Technology and Application Institute of Innovative Science and Technology Shenyang University Shenyang110044 China College of Mechanical Engineering Shenyang University Shenyang110044 China

Peroxynitrite-based advanced oxidation technology has gradually become a research hotspot for degrading dye wastewater due to its high efficiency and environmentally friendly features. Transition metal elements, which are commonly used as catalysts for the activation of persulfates, suffer from problems such as easy deactivation and leaching of metal ions, which limit their practical application. In this study, Co78Si8B14/g-C3N4 composite catalysts were prepared by wet milling and ball milling methods to investigate their degradation of Orange II dyes by assisting the activation of peroxynitrite under visible light, and the effects of the catalyst ratio, light intensity, and the dosage of catalysts on the degradation performance were investigated. It was shown that the optimum ratio of Co78Si8B14 to g-C3N4 was 1:3, and the reaction rate constants for the degradation of orange dye by Co78Si8B14/g-C3N4 + PMS + VIS were 4.3 and 5.37 times higher than those of single g-C3N4 + PMS and Co78Si8B14 + PMS, respectively. Meanwhile, the composite catalyst also showed good degradation performance for rhodamine B, methyl orange, and methylene blue dyes, and the degradation effect could reach more than 75%. Cyclic stability tests showed that the catalyst maintained a high degradation efficiency of more than 94% over multiple cycles with low ion dissolution concentration. Its high catalytic activity is attributed to the lowest adsorption energy of the composite catalyst to PMS (Eads = −1.97 eV), which facilitates the degradation reaction, while the synergistic effect of g-C3N4 and Co78Si8B14 promotes the production of ·SO4, ·OH, and ·O2−. This study provides new ideas for the development of stable and efficient catalysts to expand the synergy between PMS-based and other advanced oxidation technologies. © 2025 by the authors.

关键词： Rate constants

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A Ce3 +-activated germanate blue phosphor for indoor plant lighting and temperature sensing

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Journal of Alloys and Compounds 2025年 1026卷

作者： Kong, Ximing Ai, Ya-Ping Wei, Mingpan Ren, Shengtao Wang, Ziyao Shenyang Key Laboratory of Micro-Arc Oxidation Technology and Application Shenyang University Shenyang110044 China Longyan University Longyan364012 China School of Electrical Engineering Xi'an Jiaotong University Xi'an710049 China Ministry of Education Shenyang110044 China

Indoor plant cultivation requires artificial light sources with broadband blue emission (400–500 nm) to match chlorophyll absorption spectra, yet most phosphors exhibit narrow emission bands. Meanwhile, non-contact optical thermometers face limitations in sensitivity (−1), hindering precise temperature monitoring. Here, we report a Ce3+-activated Sr₂Ga₂GeO₇ (SGGO) phosphor that simultaneously addresses these challenges. Its broad blue emission (full width at half maximum, FWHM = 74 nm) fully overlaps with chlorophyll a and b absorption, while its temperature-dependent luminescence achieves a record relative sensitivity of 1.62 %·K−1. The phosphor was synthesized via a high-temperature solid-state method, with Ce3+ substituting Sr2+ sites confirmed by Rietveld refinement. Concentration quenching analysis revealed dipole-dipole interactions as the dominant mechanism. This work demonstrates a dual-functional material that bridges the spectral gap for plant growth lighting while demonstrating promising performance in high-sensitivity optical thermometry, advancing smart agricultural technologies. © 2025 Elsevier B.V.

关键词： Optical depth

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microstructural and corrosion characteristics of coatings on SiC/2009 aluminum matrix composites fabricated via plasma electrolytic oxidation: Variation with Zr4+ concentration

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Ceramics International 2025年

作者： Li, Zhanpeng Ma, Guofeng Wang, Ziyao Wang, Jiahao Sun, Yuan Kou, Ronghui Ren, Shengtao Shenyang Key Laboratory of Micro-arc Oxidation Technology and Application Shenyang University Shenyang110044 China School of Mechanical Engineering Shenyang University Shenyang110044 China College of Environment Shenyang University Shenyang110044 China Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences Liaoning 110016 China

Plasma electrolytic oxidation was utilized to prepare ZrO2-Al2O3-SiO2 composite coatings on the surface of SiC/2009 aluminum matrix composites. The effect of Zr4+ concentration on the microstructure of the coatings was investigated by SEM, AFM, EDS, XRD, and XPS techniques. The electrochemical corrosion behavior, long-term exposure corrosion behavior, and cavitation corrosion behavior were explored in a 3.5 wt% NaCl corrosion solution. The results showed that the surface quality of the coatings was improved by the addition of K2ZrF6. The thickness of the coatings gradually increased with the increasing amount of K2ZrF6 added. At an addition level of 6 g/L, the coatings possessed the smallest porosity and pore size, and were the most uniform. The successful participation of Zr4+ in the reaction was confirmed. The coatings were mainly composed of α-Al2O3, γ-Al2O3 and Mullite. When K2ZrF6 was added at 6 g/L, the coatings demonstrated the highest corrosion resistance and improved durability upon long-term exposure. The formation mechanism of the composite coatings and their corrosion behavior are also discussed in detail. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Composite coatings

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