JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Xiaoling Ma,Zhenlin Lv,Hongbin Tan,Caixia Wang,Lingyu Li,Yixia Wang
Yttrium aluminum garnet (YAG) nano-fibers were obtained by electrospinning using aluminum and yttrium nitrates as initial materials. Coordination agent and spinning additive influences on sol spinnability were analyzed. A stable spinning precursor sol was prepared using citric acid as a coordination agent and polyvinyl butyral as a spinning additive. Linear links were formed in precursor sol ∼4 nm in diameter. Spinning voltage effect on the fiber diameter was also studied. YAG phase was obtained after the gel fibers were sintered at 800 °C. The nano-fibers with diameter of 80–200 nm were prepared at 24 kV. YAG crystal grains were linked together forming nano-fibers.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Rongli Zhao,Xiang Guo,Jun Zhang,Ruirui Cui
This study employed the high-temperature solid-phase method to successfully synthesize a comprehensive range of Y 3 Al 12 O 5 : x Fe 3+ novel near-infrared (NIR) phosphors based on yttrium aluminum garnet material. The samples were subjected to characterization utilizing X-ray diffraction (XRD), scanning electron microscopy (SEM), absorption spectroscopy , first-principles calculations, excitation and emission spectroscopy , as well as temperature-dependent luminescence intensity analysis. Subsequently, the specimens were encapsulated within light-emitting diodes (LED) to facilitate their application in night vision and biometric sensing. The results revealed that all sintered samples were phase-pure, with particle sizes around 0.6 μm, exhibiting uniform and fully developed morphology. The absorption spectroscopy indicated a decrease in the bandgap with increasing Fe 3+ doping concentration. The first-principles results revealed that the doping of Fe 3+ introduces Fe-d orbitals, and their contribution to the conduction bands is nearly comparable to that of the d orbitals of the Y 3+ . The spectroscopic results indicated that the samples can be excited through charge transfer of O 2− → Fe 3+ , leading to near-infrared emission at 784 nm with a full width at half maximum (FWHM) of 77 nm at 280 nm, and the FWHM is 73 nm under excitation at 411 nm. The thermal stability analysis revealed that as the temperature increased, there was no observed redshift or blueshift in the emission spectra . The encapsulated NIR LED allows clear visibility of blood vessels on the hand and cacti in a dark room environment. All the aforementioned results provide substantial evidence for the significant application potential of Y 3 Al 12 O 5 : x Fe 3+ NIR phosphors in biometric sensing and night vision.
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Shuai Hu,Changqing Song,Maohui Yuan,Xin Guo,Hanchang Huang,Zelin Liu,Wenda Cui,Hongyan Wang,Zining Yang,Kai Han
High-phase purity yttrium aluminum garnet (YAG) nanoparticles (NPs), which account for more than half of the market share in solid-state lasers, are crucial luminescent ceramic matrixes used in upconversion luminescence (UCL) applications. As is well known, the optical performance of YAG NPs is greatly influenced by their phase purity, necessitating a long-duration, high-temperature annealing process to eliminate intermediate impurity phases and subsequent inspection of the crystal phases using traditional methods such as XRD. Here, we report a convenient direct method to evaluate the phase state of YAG NPs by correlating the macroscopic UCL properties with the phase evolution process of YAG NPs, given the strong dependence of UCL on the host phase structure. Yb3+/Er3+-codoped YAG NPs were fabricated using flame spray pyrolysis (FSP), an efficient industrial mass production method. The UCL intensity ratios of 556 and 546 nm (I556/I546) for Er3+ ions are used as a key parameter to assess the YAG phase states. When the I556/I546 ratio is larger than 1.80, FSP-prepared YAG:Yb3+/Er3+ NPs undergo a complete phase transformation from amorphous to hexagonal YAlO3 (YAH) and ultimately to cubic YAG, resulting in pure cubic YAG NPs with orange-to-green UCL color modulation. Our results offer an efficient optical crystal-phase probe applied for YAG and can enable the exploration of industrial phase monitoring for other optical materials.
研究领域:
材料科学
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光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Wuhui Li,Yixi Zhuang,Peng Zheng,Tian-Liang Zhou,Jian Xu,Jumpei Ueda,Setsuhisa Tanabe,Le Wang,Rong-Jun Xie
Deep-trap persistent luminescent materials, due to their exceptional ability of energy storage and controllable photon release under external stimulation, have attracted considerable attention in the field of optical information storage. Currently, the lack of suitable materials is still the bottleneck that restrains their practical applications. Herein, we successfully synthesized a series of deep-trap persistent luminescent materials Y3Al5–xGaxO12:Ce3+,V3+ (x = 0–3) with a garnet structure and developed novel phosphor-in-glass (PiG) films containing these phosphors. The synthesized PiG films exhibited sufficiently deep traps, narrow trap depth distributions, high trap density, high quantum efficiency, and excellent chemical stability, which solved the problem of chemical stability at high temperatures in the reported phosphor-in-silicone films. Moreover, the trap depth in the phosphors and PiG films could be tailored from 1.2 to 1.6 eV, thanks to the bandgap engineering effect, and the emission color was simultaneously changed from green to yellow due to the variation of crystal field strength. Image information was recorded on the PiG films by using a 450 nm blue-light laser in a laser direct writing mode and the recorded information was retrieved under high-temperature thermal stimulation or photostimulation. The Y3Al5–xGaxO12:Ce3+,V3+ PiG films as presented in this work are very promising in the applications of multidimensional and rewritable optical information storage.
研究领域:
材料科学
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光学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·Vol. 109
·期 1
·e70338
·
IF 3.8
Yuanyuan Li,Hongbing Yang,Yilei Huang,Shichang Cheng,Chang-An Wang,Yanhao Dong
As a pivotal optical material, the microstructure of YAG (yttrium aluminum garnet) nanocrystalline ceramics directly determines their laser and luminescent performance. This study demonstrates that rare-earth doping at grain boundaries significantly improves sintering behavior through a dual-stage regulation mechanism: during the initial stage (relative density 65%–90%), dopants (Nd/Ce) suppress mass diffusion by stabilizing grain boundary structures; whereas in the intermediate stage (75-85% relative density), they enhance diffusion by modifying grain boundary energy states. This kinetic regulation enables Nd-doped samples to achieve 99.3% relative density at 1200°C (50°C lower than pure YAG) while maintaining grain size at 57–64 nm. The doped systems achieved the requisite thermodynamic state for successful two-step sintering at significantly lower T 1 temperatures (Nd-YAG: 1175°C, Ce-YAG: 1175°C) compared with pure YAG (1200°C). The study confirms that Nd/Ce doping achieves coordinated densification-grain growth control through grain boundary segregation, providing critical theoretical guidance for fabricating high-performance transparent ceramics, particularly for developing novel Nd/Ce:YAG laser and scintillation ceramics.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yujuan Yang,Zhiqiang Deng,Qiufeng Huang,Zhonghua Deng,Zhuguang Liu,Jiquan Huang,Jian Chen,Wang Guo
In this study, aluminum isopropoxide (AIP) served as a sintering additive, and 0-10 at% AIP:YAG transparent ceramics were fabricated through vacuum sintering within the temperature range of 1650–1790 °C. It was found that after undergoing calcination at 800 °C, AIP transformed into a nanoscale γ-Al 2 O 3 coating layer on the surface of the precursor particles within the YAG green compacts. This γ-Al 2 O 3 coating layer not only accelerated the phase transformation rate of YAG but also boosted the densification rate of YAG ceramics when the temperature was below 1700 °C. Moreover, AIP was ultimately converted into α-Al 2 O 3 , thereby preventing the introduction of impurity ions. A doping concentration of 1.0–1.5 at% has been validated as an optimal range for AIP in YAG ceramics. The in-line transmittance of 1.0-1.5 at% AIP:YAG ceramics was significantly higher than that of 0 at% AIP:YAG ceramic at 1700 °C. While the temperature was further increased to 1790 °C, the positive effect of AIP became less pronounced. These findings indicate that AIP holds great promise as a sintering activity promoter for YAG transparent ceramics.
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产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2013
·
IF 2.143
Rujie He,Xinghong Zhang,Ping Hu,Wenbo Han,Changqing Hong
In this paper, gelcasting and pressureless sintering of YAG gel coated ZrB 2 –SiC (YZS) composite were conducted. YAG gel coated ZrB 2 –SiC (YZS) suspension was firstly prepared through sol–gel route. Poly (acrylic acid) was used as dispersant . YZS suspension had the lowest viscosity when using 0.6 wt.% PAA as dispersant. Gelcasting was conducted based on AM–MBAM system. The gelcast YZS sample was then pressureless sintered to about 97% density. During sintering, YAG promoted the densification process from solid state sintering to liquid phase sintering . The average grain sizes of ZrB 2 and SiC in the YZS composite were 3.8 and 1.3 μm, respectively. The flexural strength , fracture toughness and microhardness were 375 ± 37 MPa, 4.13 ± 0.45 MPa m 1/2 and 14.1 ± 0.5 GPa, respectively.
研究领域:
材料科学
·
陶瓷
·
复合材料
·
烧结技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Limin Wu,Zeyu Cheng,Shoulei Xu,Wenxia Wu,Yazhao Wang,Huiting Zhang,Zhonghua Zhu,Ninghan Zeng,Bernard Albert Goodman,Wen Deng
High quality optical single crystals of cubic Yb 2.96 Er 0.04 Al 5 O 12 and Y 2.96 Er 0.04 Al 5 O 12 were successfully prepared using the OFZ method. The 980 nm photon absorption intensity by Yb 2.96 Er 0.04 Al 5 O 12 crystal is much larger than that in Y 2.96 Er 0.04 Al 5 O 12 crystal, the transmission of Yb 2.96 Er 0.04 Al 5 O 12 crystal is lower than that of Y 2.96 Er 0.04 Al 5 O 12 crystal, because the density of Yb 2.96 Er 0.04 Al 5 O 12 single crystal (6.604 g/cm 3 ) is larger than that of Y 2.96 Er 0.04 Al 5 O 12 single crystal (4.529 g/cm 3 ). The up-conversion luminescence spectra of the crystals excited by 980 nm laser show several distinct groups of emission peaks at ∼544 and ∼556 nm, as well as ∼650 and ∼667 nm. The peak intensities of the up-conversion luminescence spectrum for the Yb 2.96 Er 0.04 Al 5 O 12 crystal were much higher than those for the Y 2.96 Er 0.04 Al 5 O 12 crystal. Overall, the results of the present study suggest that Yb 2.96 Er 0.04 Al 5 O 12 single crystal may have advantages over Y 2.96 Er 0.04 Al 5 O 12 single crystal for luminescence in solid-state lasers.
研究领域:
光学
·
材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Ge Zhang,Benxe Jiang,Pande Zhang,Yiguang Jiang,Shuilin Chen,Long Zhang
In this paper, we researched the growth mechanism of solid-state crystal growth (SSCG) method in planar waveguide . The effect of tetraethyl orthosilicate (TEOS) inside YAG (yttrium aluminum garnet) ceramic matrixes on the YAG single-crystal growth was studied. The results indicated that the crystal growth increased with increasing TEOS content. Theoretical analysis confirmed that the solid-state crystal growth kinetics could be fitted by the Lifshitz–Slyozov–Wagner law. Additionally, the segregation of silicon was observed, the SSCG process with SiO 2 effectively eliminated the pores in the YAG ceramic matrices via diffusion to the growth interface between the crystal and the ceramic. We successfully obtained high transparency YAG single crystal using the SSCG method, which transmittance value reached 83.62% at 1064 nm.
研究领域:
材料科学
·
晶体生长
·
光学材料
·
固体物理
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DOI
高影响因子
MATERIALS & DESIGN
·
2025
·
IF 7.9
Yuhan Yang,Haohao Ji,Mengmeng Xie,Dewen Wang,Wenhao Zhou,Jian Zhang,Yu Liu,Shiwei Wang,Zheng Wang
Gradient doping of Nd: YAG (Nd: Y 3 Al 5 O 12 ) can relieve thermal effect during laser operation in solid-state lasers. Direct ink writing (DIW) is an effective method for fabricating gradient-doped structures. However, the delay issue during component switching significantly affects rare-earth ion concentration distribution in the samples, which includes delivery delay and transitional delay. They were respectively optimised by reducing the volume of mixing zone and by modifying component switching mode. Firstly, simulations of the mixing zone before and after optimisation were conducted using ANSYS Fluent to demonstrate the mixing uniformity. Secondly, the processes of component changes during extrusion were simulated to demonstrate the effectiveness of the two delay optimisation methods. Line patterns were printed using DIW with varying mixing zone volumes and component switching modes. The delay optimisation methods were confirmed to significantly reduce the impact of the delay by measuring Nd 3+ ion concentration. Furthermore, a mathematical model was developed to assess the influence of two delay optimisation methods on the delay. Finally, 0–0.5–1–0 at% Nd: YAG gradient-doped laser ceramics were successfully fabricated based on the proposed delay optimisation method, and the performance characterization of the Nd: YAG laser ceramics confirmed the efficacy of the method.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2020
·
IF 0
Qiang-Qiang Zhu,Yao Meng,Hong Zhang,Shuxing Li,Le Wang,Rong-Jun Xie
Thermally robust phosphor ceramics are an ideal color converter for high-power laser lighting applications. However, high-quality white light is difficult to achieve due to the absence of green and red emission materials. AnY3Al5–xGaxO12:Ce3+ (YAGG:Ce3+) ceramic can emit green light, while the strong oxidizing atmosphere is needed to suppress the Ga evaporation during the high-temperature fabrication process, which can seriously decrease the luminescence efficiency. To enable the green-emitting YAGG:Ce3+ material for laser lighting application, we report a composite phosphor ceramic for which the first achieved fine-grained YAGG:Ce3+ phosphor powders were dispersed into a YAG ceramic matrix (YAGG:Ce-YAG). The transmittance of the YAGG:Ce-YAG ceramic can reach 62% at a range of 500–800 nm owing to the similar refractive index and structure of two phases. The resulting phosphor ceramic also exhibits a high external quantum efficiency (EQE = 68.3%) and excellent thermal stability (luminescence intensity: 90% retention at 200 °C) close to those of the original phosphor powders. Furthermore, due to the superior thermal conductivity of the YAGG:Ce-YAG phosphor ceramic (9.4 Wm–1 K–1 at room temperature), a high luminous emittance of 700 lm/mm2 can be achieved under an excitation of 8.2 W/mm2 blue laser light. The achieved YAGG:Ce-YAG phosphor ceramic shows a promising application as the green color converter for high-power laser lighting.
研究领域:
材料科学
·
光学工程
·
光子学
·
固态照明
✓ 已验证
DOI
CRYSTENGCOMM
·
2018
·Vol. 20
·期 48
·7773-7781
·
IF 3.304
Rui Yuan,Xi-Xi Xie,Li-Xian Zheng,Li-Li Yu,Jian-Feng Hu,Hai-Ming Qin,Zhi-Jun Zhang,Jing-Tai Zhao
By exploring the optimal reaction temperature and the ratio of Na2SO4 to the precursor, highly symmetrical rhombic dodecahedral yttrium aluminum garnet (Y3Al5O12, YAG) microcrystals with a good dispersity were successfully prepared using improved hydrothermal methods. YAG microcrystals exhibit well-developed crystal faces, high crystallinity and a controllable crystal size, from hundreds of nanometers to approximately 4 μm. The morphology and crystal size of the YAG microcrystals can be controlled by changing the reaction temperature and the ratio of Na2SO4 to the precursor. After analysis using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and energy dispersive spectrometry (EDS), the growth mechanism of the YAG crystals was studied in detail. Cerium doped YAG (YAG:Ce3+) microcrystals exhibit an intense broad band emission at approximately 523 nm. Considering the high crystallinity, controllable size and strong emission of YAG microcrystals, one has reason to assume that they could have wide applications in many areas.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）