JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Ziqiang Jiang,Jingtian Li,Guodong Sun,Weihua Luo,Peng Zhao
Transparent ceramics Y 3 Al 5 O 12 : Ce 3+ (YAG: Ce) were prepared by the spark plasma sintering (SPS) process with B 2 O 3 acting as the sintering additive. The effect of B 2 O 3 on the microstructure and luminescent properties were examined. With the help of the liquid phase created by the low melting point B 2 O 3 additives, the carbon contamination of the SPS prepared YAG: Ce ceramics was remarkably relieved, the relative density and the in-line transmittance were enhanced, and the starting temperature of densification was lowered by approximately 170 °C. Moreover, the B 2 O 3 additive could enter into the YAG host lattice as a dopant . Consequently, the smaller B 3+ ions replaced the Al 3+ ions, enhancing the crystal field splitting of Ce 3+ and significantly redshifting its 5d→4 f emission band.
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高影响因子
Journal of Materials Chemistry C
·
2025
·Vol. 13
·期 9
·4781-4790
·
IF 5.1
Hailiang Fang,Lei Li,Beiying Zhou,Weijie Li,Shijia Gu,Qi Zheng,Lianjun Wang,Wan Jiang
Composite phosphor ceramics (CPCs) have found extensive applications in high-power, high-brightness LD lighting, primarily due to their superior thermal conductivity, stability and microstructural tailorability. However, the high sintering temperatures and refractive index mismatches of CPCs impose a significant impact on their luminous efficacy and practical application. To address these challenges, this study introduces a novel approach utilizing reactive spark plasma sintering of mesoporous Y2O3 and Al2O3 powders and YAG:Ce phosphors. This approach leverages the enhanced driving forces stemming from mesoporous structure collapse and phase transformation, enabling the rapid preparation of dense polycrystalline YAG–YAG:Ce CPCs at a significantly reduced sintering temperature of 1350 °C and a short holding time of 3 minutes. Owing to the minimal refractive index difference and designed differential grain sizes, the resultant CPC exhibits a high internal quantum efficiency of 83.8%, which approaches 95.6% of that observed in YAG:Ce phosphors. When subjected to irradiation by a 450 nm laser diode, the as-prepared CPC produces white light with a remarkable luminous efficacy of 202.13 lm W−1 and a low correlated color temperature of 5298 K, highlighting the enhanced light conversion efficiency. Furthermore, the CPC presents a substantial enhancement in thermal stability, experiencing only a 6% luminescence loss at 200 °C, and could endure a high laser flux density of up to 6.68 W mm−2. These results demonstrate that the optimized YAG–YAG:Ce CPCs are well suited for solid-state laser lighting, and contribute to the ongoing advancement of next-generation lighting technologies.
研究领域:
材料科学
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光学工程
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Ziqiang Jiang,Laian Sheng,Jingtian Li,Guodong Sun,Weihua Luo,Peng Zhao
In present work, Ce 3 + -doped Y 3 Al 5 O 12 (YAG: Ce) transparent ceramics were fabricated via spark plasma sintering (SPS) using Si 3 N 4 as a multifunctional sintering additive. The effects of Si 3 N 4 on the microstructure, densification behavior, and luminescent properties were systematically investigated. It is demonstrated that Si 3 N 4 could be effectively incorporated into the YAG lattice through a charge-balanced substitution mechanism in which Si 4+ -N 3- pairs replace Al 3+ -O 2- , resulting in a significant redshift of the Ce 3+ emission from 545 nm to 582 nm due to enhanced crystal field splitting and nephelauxetic effects. Furthermore, the substitution process also yields in-situ formation of SiO 2 , which promotes densification via liquid-phase sintering, achieves a relative density exceeding 99.5 %, and partially mitigates carbon contamination. When applied in phosphor-converted white LEDs, the Si 3 N 4 -doped YAG: Ce ceramics enabled a substantial reduction in correlated color temperature (CCT) from 4903 K to 3196 K, demonstrating their potential as efficient warm-white light converters without requiring additional red phosphors.
研究领域:
材料科学
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无机非金属材料
·
发光材料
·
固态照明
·
陶瓷工艺
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高影响因子
OPTICAL MATERIALS
·
2022
·
IF 3.754
Zhong Wan,Ge Zhang,Benxue Jiang,Tao Feng,Long Zhang,Xiao Li
As a prospective alternative technique for single crystal growth , solid-state crystal growth (SSCG) is applied in the fabrication of a Nd:YAG/YAG composite structure with a high Nd 3+ doping concentration. The microstructure morphologies and segregation behavior in the ceramic matrix, growth interface, and grown crystal are investigated. The results indicate that the dopant ions diffuse along with the grain boundary migration during the SSCG process while the segregation coefficient at the growth interface is higher than that of the grain boundary. A homogeneous grown crystal without segregation generates in a 6 at.% doping sample. When the doping concentration exceeds the solubility limit of the crystal lattice , surface morphology defects emerge as numerous protuberances in an 8 at.% doping sample. The SSCG technique has bright application prospects in heavily doped YAG crystal, especially for active ion diffusion limitation during the fabrication of planar waveguides .
研究领域:
材料科学
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晶体生长
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光学材料
·
固体物理
·
光子学
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yayuan Liu,Pengcheng Hao,Bo Li,Xin Qiao,Xuanhang Wang,Juan Zhang,Jing Wang,Bo Liu,Jiangyan Wang,Leijun Shen,Zhongzhi Wang
High-power lighting has focused on critical challenges in developing light-convert materials with excellent optical performance and luminous efficiency. Phosphor-in-glass (Pig) is composed of phosphor and glass matrix, which maintains the luminous property of the phosphor while retaining the excellent characteristics of the glass matrix, including thermal stability and thermal conductivity. In this work, a facile low-temperature co-sintering process is utilized to fabricate the light-convert Y 3 Al 5 O 12 :Ce 3+ Pig (YAG: Ce-Pig) using borosilicate glass matrix of xSiO 2 -yB 2 O 3 -zNa 2 O-aZnO-bCaO (mol%) and aluminate Y 3 Al 5 O 12 :Ce 3+ yellow phosphors. The YAG: Ce-Pig was produced by cold isostatic pressing to obtain high-quality and high-density. As a result, the YAG: Ce-Pig based LED lighting devices exhibited superior optical performance with the luminous efficacy (LE) reaching 154.88 lm/W. By further encapsulating YAG: Ce-Pig in the laser lighting system, the luminous efficacy can reach 226.03 lm/W. In addition, a reflective laser illumination optical guide was designed and constructed for laser illumination testing, in which a heat dissipation substrate was added to improve the thermal conductivity during testing. The results demonstrated that the YAG: Ce-Pig preserved excellent laser illumination performance under 4.56 W/mm 2 laser power density with 873.47 lm luminous flux (LF). The material also has excellent stability and tunability in terms of color rendering index and color temperature within the range of tunable laser power. In conclusion, the YAG: Ce-Pig in this work is produced by the simple and fast low-temperature sintering process with the advantages of low cost, easy fabrication, and controllable chromaticity. As a class of excellent light-convert materials, it can effectively convert high-energy blue light and realize high-power illumination. It also provides excellent optical performance under laser lighting which is valuable for commercial applications.
研究领域:
材料科学
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光学工程
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固态照明
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激光技术
·
陶瓷与玻璃
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JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Yang Liu,Mingfu Zhang,Lijun Xu,Wei Xia
Transparent Ce 3+ :YAG ceramics have great potentials in WLEDs due to their ultra-high thermal endurance property and thermal stability of luminescence. However, it is still a challenging issue to enhance their light extraction ability. In the study, the transparent Ce 3+ :YAG ceramics were fabricated using the uniform Ce:Y 2 O 3 submicron spheres by a solid-state reactive sintering method under vacuum without any sintering additives. The content of the residual pores and grain boundaries, which acted as the “light-scattering centres” to improve the absorption of blue light, were adjusted by changing sintering temperature . The luminous efficacy of the WLED with the sample sintered at 1700 °C was as high as 104.6 lm/W, due to the appropriate quantity of the “light-scattering centres”. The microstructures, transmittance , excitation and emission spectra , luminous characteristics of the samples were studied. The results showed that the preparation progress could significantly enhance the luminous efficacy in the WLED with transparent ceramics.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Mingshuo Zhang,Qi Zhang,Rui Li,Haiqiang Ma
Conventional forming methods for MgAl 2 O 4 (MAS) ceramics struggle to fabricate complex geometries and face the inherent trade-off between densification and grain growth, while SLA-printed MAS have rarely matched the mechanical properties of their conventionally sintered counterparts. This work proposes an integrated strategy that combines stereolithography (SLA) 3D printing, pressureless sintering, and Y 2 O 3 -induced in-situ Y 3 Al 5 O 12 (YAG) phase formation. Unlike conventional doping studies, we systematically quantified the grain-boundary pinning effect using the Smith–Zener model. As the Y 2 O 3 content increased from 2 to 10 wt%, the YAG content correspondingly rose from 3.3 to 18.0 wt%, and the theoretically predicted limiting grain size of MAS first decreased from 48.09 to 8.04 μm, and then increased to 11.81 μm. The variation trend shows good consistency with the experimentally observed grain size evolution. At an optimal Y 2 O 3 content of 4 wt%, the ceramic achieved a high densification (apparent porosity 0.17%, bulk density 3.48 g cm -3 ), a flexural strength of 256.49 MPa, and a critical thermal shock temperature (ΔT c ) of 214.94 °C. The synergy between SLA and in-situ YAG pinning enables the fabrication of complex-shaped, high-strength, thermally stable MAS components, offering new insights for the development of high-performance engineering ceramics.
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JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Xing Cao,Shichang Sun,Bing Lu,Yan Liu,Rui Ma,Huiqun Cao,Hongzhi Ma,Hexun Huang
In order to overcome the shortcomings of insufficient red light component and poor thermal stability of commercial white light emitting diode (WLED), YAG:Ce, R (R: Gd 3+ , Pr 3+ , Gd 3+ and Pr 3+ ) fluorescent thin films were prepared by pulse laser deposition (PLD). The composition and microstructure, photoluminescence properties, and red-enhanced mechanism of co-doped YAG fluorescent thin films, as well as the electroluminescence behavior of the corresponding WLEDs were investigated. Results showed that the doping of Pr 3+ caused the emission spectrum energy of Ce 3+ to migrate, and an emission peak appeared at 606 nm in the red region. The doping of Gd 3+ caused the emission spectrum of Ce 3+ to shift to the red region, and the main peak position of the Ce 3+ emission spectrum is red-shifted from 523 nm to 548 nm. The YAG:Ce,Pr,Gd fluorescent film not only realized the improvement of red light components and red-shift, but also increased the energy transmission efficiency from 33.3% to 51.9%. Moreover, results of the color coordinate analysis also showed that the co-doping of Gd 3+ and Pr 3+ made the luminescence closer to the red region, reducing the color temperatures and hues changed to warm. Thus, tri-doped transparent fluorescent thin film were prospective for WLED application.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2026
·Vol. 46
·期 12
·118382
·
IF 6.3
Junli Yan,Guangxu Tian,Hao Guo,Qi Zhu,Tao Zhang,Fuhui Wang
The inner walls of semiconductor processing chambers are susceptible to corrosion and failure under prolonged exposure to harsh environments. Applying protective ceramic coatings can effectively suppress plasma-induced erosion. This work focuses on high-hardness Y 3 Al 5 O 12 (YAG) ceramics. By introducing La–O bonds, the interfacial strength and corrosion resistance of the coatings are enhanced. A low‑temperature co‑precipitation method combined with liquid‑phase coating was employed to fabricate composite powders of (Y 0.7 La 0.3 ) 2 O 3 @Al 2 O 3 (YLAO) and (Y 0.7 La 0.3 ) 2 O 2 F 2 @Al 2 O 3 (YLAFO) for YAG ceramic coatings, effectively suppressing the differential interfacial reactions between Y and La. The YLAFO coatings exhibit a dense microstructure with uniform elemental distribution. Under NF 3 /O 2 /Ar mixed‑plasma etching conditions, the coating shows an etching rate of only 2.81 nm/min, representing an approximately 88% improvement in erosion resistance compared to Y 2 O 3 ‑derived (YO) YAG coatings. This work demonstrates that coating performance can be enhanced through compositional design and process control, providing a feasible solution for protecting semiconductor etching components.
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CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Tao Long,Zixin Wang,Yuxiao Fan,Hui Lin,Haojie Sun,Cheng Zou,Dawei Zhang,Songlin Zhuang
In this study, two kinds of composite ceramic phosphors, Ce 3+ :YAG/Al 2 O 3 and Ce 3+ :Y(Gd)AG/Al 2 O 3 were prepared via solid state reaction sintering in flowing pure oxygen at atmospheric pressure. The ceramic phosphors were packaged into chip-scale white light emitting diodes (w-LEDs), and laser assisted w-LED automobile headlight prototypes were assembled. The luminous flux output of the w-LEDs was significantly improved through additional blue diode laser excitation. Notably, the Al 2 O 3 phase is able to impart an improvement in the luminescence saturation exhibited by Ce 3+ :Y(Gd)AG, which typically reaches saturation prior to Ce 3+ :YAG.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xiaoqian Xi,Le Zhang,Mingyuan Liu,Chunming Zhou,Lv Zhu,Yifei Cao,Cen Shao,Zhongying Wang,Cong Wei,Zihan Ren,Xiaodong Wu,Bin Fei,Haidong Ren,Hao Chen
Aqueous tape casting exhibits unique advantages in the production of large transparent ceramic (TC) flakes. However, the high surface energy of aqueous slurries results in poor wettability with carrier tapes, thereby making it difficult to obtain high-quality green bodies. In addition, organic additives always introduce unexpected defects into TCs. In this study, the wettabilities of an aqueous solution on various carrier tapes were compared, and the rheological behaviours of a slurry were systematically investigated. The cellophane (PT) carrier with high surface energy dramatically improved the wettability of the aqueous slurry. The organic content of the optimized slurry was as low as 12.0 wt%. The dried green body was defect-free, and its tensile strength reached 8.7 MPa. The deformation degree of the TC flakes was only approximately 0.3%. The YAG flakes with dimensions of 100 mm × 100 mm × 1 mm exhibited a high transmittance of 82.8% (@400 nm). The ideas, methods, and results of this study will accelerate the application of aqueous tape casting in the field of high-tech ceramics.
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危险品化学品经营许可证（带存储）