INFRARED PHYSICS & TECHNOLOGY
·
2021
·
IF 2.638
Yuxin Pan,Hui Lin,Ruijin Hong,Dawei Zhang,Haojie Sun
A series of Yb 3+ , Ho 3+ , Ce 3+ :YAG ceramics have been sintered at 1780 °C by high temperature solid state reaction under oxygen atmosphere. The absorption spectra , fluorescence spectra and fluorescence decay curve were discussed. The Judd-Ofelt (J-O) theory was applied to obtain the values of Ω 2 = 13.95 × 10 −20 cm 2 , Ω 4 = 3.94 × 10 −20 cm 2 and Ω 6 = 0.87 × 10 −20 cm 2 , respectively. After doping the Ce 3+ ions, the σ em of Yb 3+ , Ho 3+ , Ce 3+ :YAG ceramic at 2094 nm increased from 5.67 × 10 −20 cm 2 to 7.26 × 10 −20 cm 2 . These results demonstrate that Yb 3+ , Ho 3+ , Ce 3+ :YAG ceramic could be promising for 2 μm region.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Xin Xu,Lin-Lin Zhu,Min-Min Dai,Cheng-Cai Zhao,Guang-Xiang Zhang,Yu-Jian Jian,Hua-Tay Lin
Highly transparent polycrystalline Tm 2 O 3 ceramics were successfully fabricated by vacuum sintering at temperatures from 1650 to 1850 °C for 8 h using commercial Tm 2 O 3 and ZrO 2 (1 at%) powders as starting materials. It is the first time that ZrO 2 was reported as a sintering additive to prepare Tm 2 O 3 transparent ceramics. The effects of sintering temperature on the optical transmittance and microstructure of Tm 2 O 3 transparent ceramics were studied. The desired Tm 2 O 3 ceramics with relative density of 99.8% and an average grain size of approximately 9.7 μm were obtained at 1800 °C and the in-line transmittance reached 75% at 880 nm and fluctuated around 80% from 2100 to 2400 nm, respectively. This study demonstrated that Tm 2 O 3 transparent ceramics with higher in-line transmittance and smaller grain size could be prepared by using ZrO 2 as sintering additive at a relatively lower vacuum sintering temperature compared to those already reported in open literatures.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Zixin Wang,Hui Lin,Dawei Zhang,Ruijin Hong,Yanna Tian,Jie Chen,Shengming Zhou
In this paper, Ba 0.75 Al 11 O 17.25 was selected as the host for the Eu 2+ and Mn 2+ co-dopants due to the Reidinger defects in its lattice. Upon the 365 nm excitation, the phosphors presented the cyan to green tunable emission by changing the doping concentration of Mn 2+ . Moreover, this phosphor possesses zero-thermal quenching up to 448 K due to the interaction between the traps and Eu 2+ /Mn 2+ . The completely densified ceramic guaranteed the high optical transmittance (∼72 % at 516 nm) and thermal conductivity (4.3 W·m −1 ·K −1 at room temperature). When combined with a 6 W commercial 365 nm emitting LED chip, the temperature of the ceramic eventually stabilized at 428 K and the luminous efficacy of the LED device was almost not influenced by the thermal quenching effect. This work may open a way for exploring new phosphor conversion materials for HP/HB PC solid state lighting.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 12
·7491-7499
·
IF 3.094
Ziyu Liu,Guido Toci,Angela Pirri,Barbara Patrizi,Jinbang Li,Zewang Hu,Jiabei Wei,Hongming Pan,Tengfei Xie,Matteo Vannini,Jiang Li
In this article, 5 at.% Yb:Lu 2 O 3 transparent ceramics were fabricated by vacuum sintering combined with hot isostatic pressing (HIP) posttreatment using co-precipitated nano-powders. The influence of precipitant molar ratio, ammonium hydrogen carbonate, to metal ions (AHC/M 3+ , R value) on the properties of Yb:Lu 2 O 3 precursors and calcined powders was investigated systematically. It was found that the powders with different R value calcined at 1100°C for 4 hours were pure cubic Lu 2 O 3 but the morphologies of precursors and powders behaved differently. The opaque samples pre-sintered at 1500°C for 2 hours grew into transparent ceramics after HIP posttreatment at 1750°C for 1 hour. The final ceramic with R = 4.8 showed the best optical quality with the in-line transmittance of 79.7% at 1100 nm. The quasi-CW laser operation was performed at 1034 nm and 1080 nm with a maximum output power up to 8.15 W as well as a corresponding slope efficiency of 58.4%.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
Materials
·
2015
·Vol. 8
·期 8
·5363-5375
·
IF 2.651
Liangjie Pan,Benxue Jiang,Jintai Fan,Qiuhong Yang,Chunlin Zhou,Pande Zhang,Xiaojian Mao,Long Zhang
The synthesis of pure and well dispersed lutetium aluminum garnet (LuAG) powder is crucial and important for the preparation of LuAG transparent ceramics. In this paper, high purity and well dispersed LuAG powders have been synthesized via co-precipitation method with lutetium nitrate and aluminum nitrate as raw materials. Ammonium hydrogen carbonate (AHC) was used as the precipitant. The influence of aging time, pH value, and dripping speed on the prepared LuAG powders were investigated. It showed that long aging duration (>15 h) with high terminal pH value (>7.80) resulted in segregation of rhombus Lu precipitate and Al precipitate. By decreasing the initial pH value or accelerating the dripping speed, rhombus Lu precipitate was eliminated and pure LuAG nano powders were synthesized. High quality LuAG transparent ceramics with transmission >75% at 1064 nm were fabricated using these well dispersed nano LuAG powders.Keywords:co-precipitation method;single phase;pH values;LuAG powder;transparent ceramics
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Weiwei Li,Haijun Huang,Bingchu Mei,Jinghong Song,Xiaodong Xu
This study aims to investigate the role of Y 3+ ion on microstructure, optical transmittance, and thermal properties of CaF 2 transparent ceramics. Series of nanosized CaF 2 powders doped with different concentration of Y 3+ ion were synthesized by direct precipitation method. XRD , FSEM and TEM results demonstrated that the CaF 2 nanoparticles could be tuned in size through doping of Y 3+ ion. Corresponding CaF 2 transparent ceramics were fabricated by hot-pressed (HP) method. Compared with the undoped CaF 2 sample, the transmittance of the CaF 2 ceramics improved dramatically after doping with Y 3+ ions and reached above 80% at the wavelength of 1200 nm. The effects of Y 3+ ion on the microstructure and thermal properties of CaF 2 transparent ceramics were also investigated. Overall consideration of the transmittance and thermal properties of the samples, the optimal concentration of Y 3+ ion was about 1 at.%.
研究领域:
材料科学
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光学工程
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2017
·
IF 2.572
Weiwei Li,Haijun Huang,Bingchu Mei,Jinghong Song,Guoqiang Yi,Xinsheng Guo
In this paper, high optical quality of Ho:CaF 2 (2 at%) transparent ceramics based on nanopowders were fabricated by hot-pressed method successfully. Ho:CaF 2 ceramics with the average size of about 500 nm were obtained at 800 °C for 1 h. The transmittance of the sample measured to be 89% at the wavelength of 1300 nm. The reduced transmittance in the near-IR range is likely due to the residual pores in the ceramics. The spectral properties of Ho:CaF 2 ceramics demonstrated that there is a strong emission peak around 2030 nm under the excitation of 640 nm.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zhiwei Zhou,Bingchu Mei,Jinghong Song,Weiwei Li,Yu Yang,Guoqiang Yi
CaF 2 -SrF 2 hosts with substitution disorder of Ca 2+ /Sr 2+ sites in the lattice provide lower local symmetry for RE 3+ ions compared with pure CaF 2 or SrF 2 hosts, thereby facilitating more efficient 4f → 4f transitions. Here we report a study of effects of Sr 2+ content on microstructure and spectroscopic properties of Nd 3+ doped Ca 1-x Sr x F 2 transparent ceramic. Phase and microstructure analyses show that when x is in the range of 0–0.25, Nd: Ca 1-x Sr x F 2 nanoparticles keep pure CaF 2 phase with their size, morphology and agglomeration degree mildly changed. Increasing x from 0 to 0.2 significantly improves the luminescence intensity, emission lifetime and emission cross-section of Nd: Ca 1-x Sr x F 2 , however, hardly affects the concentration quenching. The luminescence intensities and emission lifetimes of x = 0.2 and 0.25 samples are very close, probably indicating SrF 2 phase has already formed in x = 0.25 sample. Based on the spectroscopic properties, the optimal Sr 2+ content is found to be x = 0.2.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2016
·
IF 2.933
Chaoyang Ma,Fei Tang,Jiangfeng Zhu,Zicheng Wen,Yang Yu,Ke Wang,Miaomiao Du,Jiantao Zhang,Jiaqi Long,Xuanyi Yuan,Wang Guo,Yongge Cao
Composite structures of YAG/1 at% Nd-doped LuAG/YAG, YAG/1 at% Nd-doped LuAG and YAG/5 at% Yb-doped LuAG transparent ceramics were successfully fabricated by non-aqueous tape-casting method and vacuum sintering technology. Cation (Y 3+ , Lu 3+ , Nd 3+ , Yb 3+ ) diffusion behavior across the contact boundaries between ytterbium (Yb) or neodymium (Nd) doped lutetium aluminum garnet (LuAG) and un-doped yttrium aluminum garnet (YAG) was studied by the electron probe X-ray micro-analysis (EPMA). The diffusion concentration profile curves were well modeled by Harrison type B kinetics. Curves of concentration vs depth were well fitted by Fick’s second low and the log of the average concentration varies as 6/5 power of penetration depth in the diffusion range was demonstrated. Meanwhile, the bulk diffusion coefficient and grain boundary diffusion coefficient were calculated. For YAG/Nd:LuAG transparent ceramic, under an 808 nm diode laser pumping, the 1064 nm continuous wave (C.W.) laser output beam with good quality was achieved.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Optical Materials Express
·
2014
·Vol. 4
·期 5
·1042-1049
·
IF 2.923
Lin Ge,Jiang Li,Zhiwei Zhou,Haiyun Qu,Manjiang Dong,Yan Zhu,Tengfei Xie,Wei Li,Min Chen,Huamin Kou,Yun Shi,Yubai Pan,Xiqi Feng,Jingkun Guo
Composite YAG/Nd:YAG/YAG transparent ceramics for planar waveguide laser were fabricated by non-aqueous tape casting and solid-state reactive sintering. The slurry made from the oxide powder mixtures shows a shear thinning behavior. The morphologies of the tapes were homogeneous in structure, and the tapes had appropriate strength and toughness. After calcining at 600°C for 10h in air, the samples contained less than 0.05wt.% of carbon. No gaps were found between the layers on the fracture surface of the green body compacted by cold isostatic pressing. The composite YAG/Nd:YAG/YAG transparent ceramics with in-line transmittance of 82.5% at 1064nm were obtained by vacuum-sintering at 1760°C for 30h, whose average grain size is 36.8μm. The diffusion distance of the Nd3+ ions was about 150μm along the thickness direction of the ceramics.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Penghui Chen,Qiang Liu,Yagang Feng,Xiaoying Li,Xiaopu Chen,Yumin Liu,Jiang Li
Y 0.16 Zr 0.84 O 1.92 transparent ceramics were successfully fabricated by air pre-sintering combined with HIP post-treatment from the nanopowder synthesized by the co-precipitation method. Fine and low-agglomerated Y 0.16 Zr 0.84 O 1.92 powder with the average particle size of 14.8 nm was obtained by calcining the precursor at 800 °C for 4 h. The influences of pre-sintering temperature on the microstructure and optical quality of Y 0.16 Zr 0.84 O 1.92 ceramics were investigated. It is found that the relative density of pre-sintered Y 0.16 Zr 0.84 O 1.92 ceramics increases from 82.1% to 96.1% and the average grain size increases from 0.6 μm to 6.0 μm with the pre-sintering temperature increasing from 1250 °C to 1500 °C. The Y 0.16 Zr 0.84 O 1.92 ceramic sample pre-sintered at 1300 °C for 2 h and HIP post-treated at 1800 °C for 3 h without sintering additives exhibits the best transparency. In-line transmittance of Y 0.16 Zr 0.84 O 1.92 ceramics with the thickness of 1.0 mm reaches 72.4% at 800 nm, which is near to the theoretical transmittance.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
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.
研究领域:
材料科学
·
陶瓷工程
✓ 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）