JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Zuodong Liu,Shuyin Zhang,Pengyue Dong,Yu Yang,Qiqi Wang,Yongsheng Yu,Bingchu Mei,Peng Liu,Qiangshan Jing
A novel transparent SrF 2 /Nd:SrF 2 /SrF 2 composite ceramic with sandwich-like laminar configuration was designed and successfully fabricated by the hot-pressed sintering method. The composite ceramic possesses an apparent transition interfacial (about 200 μm in thickness) between SrF 2 and Nd:SrF 2 layers, formed by non-uniform distribution of raw powders and the diffusion of Nd ions during the high temperature sintering. The average grain sizes of SrF 2 and Nd:SrF 2 layers are about 262.1 μm and 28.6 μm, respectively. For a 2-mm thick transparent SrF 2 /Nd:SrF 2 /SrF 2 composite ceramic hot-pressed at 900 °C for 2 h, the transmittance at 500 nm and 1200 nm are about 49.6 % and 62.3 %, respectively. The microstructure, emission spectra and thermal conductivities of ceramics are also detected and studied.
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
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Zuodong Liu,Qilong Shen,Yuqing Wang,Songchang Fu,Litao Yang,Xue Chen,Bing Liu,Guoqiang Yi,Bingchu Mei,Qiangshan Jing,Peng Liu
A series of PrF 3 -doped SrF 2 ceramics were fabricated by the hot-pressed (HP) sintering method. The influence of PrF 3 concentrations on the microstructure and optical characterizations of transparent ceramics was investigated. PrF 3 doping was found to have a positive effect on increasing optical transmittance . The luminescence intensity and lifetime quenching of Pr:SrF 2 ceramics at high doping concentrations were attributed to the Pr 3+ -Pr 3+ interactions through the intense CR process. The luminescence color of Pr:SrF 2 ceramics was tuned from the blue region to the reddish region, and finally to the orange region with increasing PrF 3 concentrations. The effect of sintering temperature on the optical transmittance and microstructure of Pr:SrF 2 ceramics was also measured and discussed. The highest transmittance of the Pr:SrF 2 ceramic (doped with 5 wt% PrF 3 and sintered at 950 °C) at 350 nm and 1200 nm were 90.4% and 91.9%, respectively.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
OPTICS EXPRESS
·
2022
·Vol. 30
·期 18
·31889-31897
·
IF 3.833
Leipeng Li,Leipeng Li,Leipeng Li,Zhuqin Wu,Zhuqin Wu,Pinshu Lv,Chunzheng Wang,Xiumei Han,Yanmin Yang,Yanmin Yang
Luminescence-based thermometry, especially the ratiometric temperature sensing technology, has attracted considerable attention recently due to its characteristics such as non-contact operating mode and strong capacity of resisting disturbance. Differing from the conventional strategy that usually needs continuous excitation, here an optical thermometry, which we have named the persistent luminescence intensity ratio (PLIR) thermometry, is proposed. The PLIR thermometry relies on the optical material SrF2:Pr3+ that could emit luminescence for several hours and even longer after being charged by X-ray. It has been demonstrated that the PLIR is sensitive to the variation of temperature and complies with the Boltzmann distribution. More importantly, the reliability of the proposed PLIR thermometry is verified. Our work may inspire others to develop more persistent luminescence thermometry.
研究领域:
材料科学
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光学
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温度测量
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Zuodong Liu,Yue Cao,Jiashun Wang,Siya Li,Qilong Shen,Yongsheng Yu,Bingchu Mei,Qiangshan Jing,Peng Liu
Near-infrared pumped up-conversion luminescent PrF 3 and YbF 3 co-doped SrF 2 ceramics were fabricated by the hot-pressing sintering technique, and the pellets were transparent with a primrose yellow appearance. The influence of YbF 3 co-doping levels on the optical qualities and microstructures of ceramics was investigated. We identified the mechanisms to realize up-conversion luminescence in the visible range from 3 P 0,1 levels (Pr 3+ ) under near-infrared wavelength pumping sources other than the near ultraviolet to blue region photons. Yb 3+ ions inducing a broad and intense absorption band at the 900–1050 nm region, and the absorption coefficient and cross-section at 980 nm are 7.57 cm −1 and 4.19 × 10 −21 cm 2 in the ceramic co-doped with 15 wt% YbF 3 , respectively. The intense up-conversion luminescence bands at 480, 520, 540, and 600 nm under 980 nm excitation were attributed to 3 P 0 → 3 H 4 , 3 P 1 → 3 H 5 , 3 P 0 → 3 H 5 and 1 D 2 → 3 H 4 transitions of Pr 3+ ions, respectively.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yucheng Li,Xuechun Yang,Kuan Ren,Yulin Liu,Zhan Xu,He Feng,Keli Deng,Bo Deng,Wanli Shang,Jianjun Dong,Feng Wang,Qianli Li,Xuyong Yang
X-ray imaging has garnered widespread interest in biomedical diagnosis and nondestructive detection. The exploration of radio-photoluminescence has hastened the advancement of X-ray information storage. However, significant challenges persist in achieving the prolonged imaging of curved objects without attenuation. Here, europium-doped strontium fluoride (SrF2:Eu) is meticulously created to exhibit a linear response to an extensive range of X-ray doses (maximum dose > 5000 Gy), showcasing excellent X-ray information reading/erasing reusability properties (10 cycles). This is accompanied by a red-to-blue emission transition under UV excitation, sustaining for 150 days without attenuation. To elucidate the phenomena of irradiated photoluminescent discoloration and the reversible X-ray storage of SrF2:Eu, we propose an electron-vacancy trap (valence conversion) mechanism, information stably retained by the SrF2:Eu-based device under ambient conditions due to high energy barriers. The time-lapse readout capability is further demonstrated for three-dimensional imaging of curved objects (10 lp mm–1) based on SrF2:Eu embedded within a polydimethylsiloxane (SrF2:Eu@PDMS). The SrF2:Eu demonstrates time-lapse imaging, reversible radio-photoluminescence, and recoverable X-ray storage, offering a promising avenue for optical information encryption and anticounterfeiting applications.
研究领域:
材料科学
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医学影像
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光学工程
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产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Meng Fei Zhou,Cheng Chao Hu,Jian Bing Yin,Yu Jiang,Bing Liu,Kai Xin Song
SrF 2 is a promising low- ε r fluoride with outstanding microwave dielectric properties , while densification of SrF 2 ceramics is challenging via traditional thermal sintering (TTS). In this work, dense SrF 2 ceramics with 93.4%–97.2% relative density have been obtained via cold sintering (300 MPa–900 MPa, 150 °C, 1 h) and subsequent post-annealing at 950 °C/3 h. The pretreated cold sintering process is beneficial for microstructure optimization, where the maximum Qf value (62,037 GHz) is obtained at 750 MPa, nearly three times higher than the TTS sample (21,080 GHz). An ultra-low dielectric constant ( ε r ) of 5.94 is simultaneously obtained, together with a temperature coefficient of resonant frequency τ f = −78.26 ppm/°C. Good chemical compatibility between SrF 2 ceramics and silver is verified, indicating great promise for their use in LTCC technology. Moreover, the low- ε r and high Qf values of the cold sintering optimized SrF 2 ceramics suggest great potential in the 5G millimeter-wave antenna systems. A SrF 2 -based dielectric resonator antenna is designed and fabricated, which resonates at the desired 24.5 GHz and exhibits an outstanding S 11 of −43.95 dB and a broad bandwidth of 4.51 GHz.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 14
·6469-6478
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IF 3.591
Qingling Zeng,Wenxiang He,Fangfei Luan,Yu Yan,Hongli Du,Juan Fu,Dongcai Guo
A succession of erbium single-doped and erbium/ytterbium co-doped SrF2 nanoparticles (NPs) were fabricated via a hydrothermal synthesis technique followed by high-temperature calcination. Structural, morphology, and element information of SrF2 NPs were explored using X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) instruments. Under near-infrared (NIR) excitation, the SrF2:Er3+ NPs exhibit a prominent red emission peak (at 670 nm) as well as two oppositely faint green emission peaks (at 525 nm and 548 nm). The probable mechanism of the dominant red up-conversion luminescence (UCL) emission was systematically studied by UC emission spectroscopy, Raman spectroscopy, Fourier transform-infrared spectroscopy (FT-IR) and diffuse reflectance spectrum analyses. We used the energy gap law to estimate the probability of electronic transition, which determines the UCL emission route. The behavior of the R/G value (emission intensity of red to green ratio) and the slope n (the number of photons absorbed during the excitation process) reflected the existence of a highly efficient cross-relaxation (CR) effect during the UC process in the SrF2 system, so we can infer that the prominent red UCL emission is due to the CR effect among adjacent erbium atoms. After co-doping with ytterbium ions, the red UCL emission intensity is further enhanced. By comparing 2 mol% Er3+,5 mol% Yb3+ co-doped SrF2 samples with a similar composition without ytterbium doping, a red UCL emission intensity enhancement of about 200 times was observed. This increase is ascribed to the existence of effective energy transfer up-conversion (ETUC) from ytterbium to erbium, and the presence of a large absorption peak of ytterbium in the range of 830–1060 nm was observed in the diffuse reflectance spectrum, indicating that ytterbium's ability to absorb 980 nm photon energy is significantly stronger than erbium's. The strong red radiation obtained for erbium/ytterbium co-doped SrF2 NPs is expected to have potential application prospects in in vivo bio-imaging and photodynamic therapy.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mo Wei,Juan Liu,Bing Liu,Kai Xin Song,Cheng Chao Hu,Yu Hui Huang
Alkaline earth metal fluorides, BaF 2 and SrF 2 , are promising low-permittivity ceramics with excellent microwave dielectric properties. However, achieving ideal densifications in BaF 2 and SrF 2 ceramics remains challenging due to their low surface-free energy. In this study, the sintering characteristics of BaF 2 and SrF 2 ceramics are optimized via forming (1– x )BaF 2 - x SrF 2 ( x = 0.2, 0.4, 0.5, 0.6, and 0.8) solid solution ceramics. X-ray diffraction (XRD) patterns and Raman spectra provide compelling evidence for successfully forming (1– x )BaF 2 - x SrF 2 solid solutions across the entire composition range. The solid-solution effect significantly enhances densification at a much lower sintering temperature of around 825 °C. Notably, 0.6BaF 2 -0.4SrF 2 ceramics exhibit the optimal microwave dielectric properties with a permittivity ( ε r ) of 7.26, quality factors ( Qf ) of 61,006 GHz at 10 GHz and 106,000 GHz at 25 GHz, and a temperature coefficient of resonant frequency ( τ f ) of −97.46 ppm/ ° C. Additionally, the advancement of low-temperature co-fired ceramic (LTCC) technology for high-density electronic packaging presents a significant challenge in achieving compatibility between the coefficient of thermal expansion (CTE) of the packaged components. The 0.6BaF 2 -0.4SrF 2 ceramics exhibit a significantly higher CTE of 21.67 ppm/ ° C compared to most low- ε r ceramics (usually below 10 ppm/ ° C), resulting in better CTE matching with organic laminates and metal electrodes. Therefore, BaF 2 -SrF 2 solid solution ceramics, addressing the need for low- ε r , high- Qf , and high CTE, offer a potential solution for high-reliability LTCC electronics.
研究领域:
材料科学
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电子工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 25
·1-11
·
IF 2.8
Wang Chen Bo,Gong Wei Ping,Jin Jing Ye,Bai Hao Nan,Yang Yang,Zhou Qing Wei,Yu Xue Qing,Mao Min Min,Cao Lei,Song Kai Xin,Liu Bing
SrF 2 is a promising low-permittivity fluoride with excellent microwave dielectric properties. Nevertheless, realizing densification in SrF 2 ceramics remains challenging due to their low surface energy. In this work, a series of SrF 2 – x wt%LiF ( x = 0.5–20) ceramics were synthesized using the conventional solid-state reaction method. The incorporation of LiF effectively lowered the sintering temperature from 1050 °C to 775 °C and improved the relative density from 91% to 97.1%. Outstanding microwave dielectric properties ( ɛ r = 6.39, Qf = 71,024 GHz at 20 GHz and τ f = −85.1 ppm/°C) were achieved at x = 1.0, demonstrating great potential in millimeter-wave communication applications. In addition, the present ceramics demonstrated good chemical compatibility and a well-matched coefficient of thermal expansion with silver electrodes. Finite element simulations further revealed significantly reduced thermal stress when employing the present ceramics as substrates, highlighting the strong potential for high-reliability low temperature co-fired ceramic (LTCC) applications.
研究领域:
材料科学
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陶瓷材料
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微波工程
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电子封装
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固体物理
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产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Linxuan Wang,Weiqiang Yang,Liang Li,Shuai Hu,Maohui Yuan,Zining Yang,Kai Han,Hongyan Wang,Xiaojun Xu
In this work, a sequence of Nd3+, Yb3+, and Er3+ tridoped SrF2 nanocrystals (NCs) is synthesized by a hydrothermal method. Both the efficient near-infrared downconversion luminescence (DCL) and visible upconversion luminescence (UCL) of the Er3+ and Nd3+ ions are simultaneously observed and systematically demonstrated under dual-wavelength excitation (808 and 980 nm continuous-wave lasers). Subsequently, the SrF2:Nd3+/Yb3+/Er3+ (15/4/0.2 mol %) NCs with the strongest luminescence were utilized for detecting the metal ion concentrations under 808 nm excitation. The results reveal that both the UCL and DCL gradually decrease as the metal ion concentrations increase, and high sensitivity is obtained for Cu2+ ions with a detection limit of 0.22 nM (∼650 nm) and 0.63 nM (∼976 nm). In addition, these SrF2:Nd3+/Yb3+/Er3+ NCs are further demonstrated to achieve a solid-state display under 980 nm excitation, exhibiting obvious “red” and “green” patterns by varying the doping rare earth ion concentrations.
研究领域:
材料科学
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光学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 21
·期 11
·1691-1700
·
IF 3.304
Zhikun Wang,Wenfeng Han,Huazhang Liu
Uniform, free-standing and cubic SrF2 microparticles were successfully fabricated by a facile hydrothermal method with ethylenediaminetetraacetic acid (EDTA) as the chelating agent. The influences of preparation conditions, such as the pH value, amount of EDTA and hydrothermal time, on the formation of SrF2 crystals were investigated. The formation mechanism of cubic SrF2 particles was proposed based on the experimental results. Following calcination in air at 500 °C, SrF2 particles were evaluated as the catalyst for the pyrolysis of 1-chloro-1,1-difluoroethane (HCFC-142b, CH3CClF2) to vinylidene fluoride (VDF, CH2CF2) at 350 °C and a space velocity of 600 h−1. The results indicate that SrF2 cubes exhibit high catalytic activity with a HCFC-142b conversion of about 70% and a selectivity to VDF of 80–87%. No significant deactivation was observed within the time on stream of 30 h. With the reaction temperature increased to 450 °C, the conversion of HCFC-142b is close to 94%, while the selectivity to VDF remains almost unchanged. Although the SrF2 catalyst prepared by the conventional precipitation method also shows high conversion, its selectivity to VDF is only around 50–70%. We suggest that the surface acidity and specific surface area play major roles in the catalytic performance. Compared with the temperatures for industrial manufacture of VDF of 650–700 °C, the SrF2 catalysts provide a promising pathway to produce VDF at much lower temperatures.
研究领域:
化学工程
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材料科学
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催化
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环境化学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Zuodong Liu,Yumeng Ji,Chunyan Xu,Yuqing Wang,Yang Liu,Qilong Shen,Guoqiang Yi,Yongsheng Yu,Bingchu Mei,Peng Liu,Qiangshan Jing
Raw SrF 2 powders were synthesized by the chemical precipitation method, and the mean particle size was 58.48 nm. Er:SrF 2 transparent ceramics were obtained by hot-pressed (HP) technique, and the effect of ErF 3 levels on the transparency, microstructure, luminescence spectroscopic and microhardness were studied. The ratio of emission intensities R (Red/Green) increased with the ErF 3 doping levels. The addition of ErF 3 was found effectively to reduce grain size and has a positive effect on improving the microhardness. The SrF 2 ceramic doped with 5 wt.% ErF 3 (2 mm thick) showed the best optical transparency, the transmittance at 500 nm and 1200 nm are 87.9 % and 89.5 %, respectively. The average grain size, Vickers hardness ( Hv ), and fracture toughness ( K IC ) for the SrF 2 ceramic were 21.1 ± 4.5 μm, 1.73 ± 0.04 GPa, and 0.52 ± 0.08 MPa·m 1/2 , respectively.
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
危险品化学品经营许可证（带存储）