JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 8
·3862-3872
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IF 3.784
Xinwen Liu,Zhiwei Zhou,Weiwei Li,Yu Yang,Bingchu Mei
Barium fluoride (BaF 2 ) crystals are attracting much attention as efficient inorganic scintillator promising for high-energy physics, industrial inspection, and other fields because of the fast component of the decay time (0.6 ns) and high radiation resistance. However, two major drawbacks limit its practical application: (i) a slow decay time of ~600 ns is derived from self-trapping excitons; (ii) the absolute light yield from the fast luminescence component is not competitive. The introducing of rare earth ions and preparation of BaF 2 polycrystalline ceramics is considered to be effective measures to solve these bottlenecks. Pr 3+ is extremely suitable as the activated ion of scintillation materials, which possess emission peaks located in visible band and the faster 5 d –4 f transition. In this work, highly sinterable Pr 3+ :BaF 2 precursor powder was synthesized via the coprecipitation method by adjusting the reactant concentration and temperature. The morphology and microstructure of as-synthesized powders were characterized using scanning electron microscopy (SEM) and transmittance electron microscopy analysis. The 5 at.% Pr 3+ :BaF 2 transparent ceramic with a transmittance of 50.7% at the wavelength of 500 nm was fabricated by hot pressing the as-prepared powders at 900°C for 4 h under the axial pressure of 50 MPa. The SEM images of ceramic cross-section show that the residual pore is the main light scattering source. The absorption and emission spectrum of ceramic samples were discussed.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
·
2017
·Vol. 73
·期 2
·99-103
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IF 1.432
Lu Pan,Xiaozhan Yang,Chaoyue Xiong,Dashen Deng,Chunlin Qin,Wenlin Feng
A series of new red-orange emission phosphors Na 2 BaMg(PO 4 ) 2 :Pr 3+ were synthesised by a high-temperature solid-state reaction. The crystal structure and photoluminescence properties of these samples were characterised by X-ray diffraction and spectroscopic measurements. This compound holds P 3̅ m 1 space group of the trigonal system with the lattice parameters of hexagonal cell a =0.5304(3) nm and c =0.6989(3) nm. The phosphor emits the strongest peak at 606 nm when excited by 449 nm. The average Commission Internationale de l’Eclairage chromaticity coordinates calculated for the phosphors are (0.52, 0.46). The results demonstrate the potential application of these phosphors in solid-state lighting and other fields.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 42
·15112-15120
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IF 7.393
Wei Tang,Chuandong Zuo,Yingkui Li,Chaoyang Ma,Xuanyi Yuan,Zicheng Wen,Yongge Cao
Owing to the impact of robust thermal quenching, lanthanide-based luminescence thermometer operation can usually only be achieved within a comparatively small temperature scope (ambient temperature to 800 K). Here, this study presents a method for addressing the mentioned limits, and a luminescence thermometer with an ultra-wide temperature range has been achieved, which adopted Pr3+-doped Ba(Zr0.16Mg0.28Ta0.56)O3 transparent ceramic to be the optical temperature probe. Based on the high luminescence intensity and excellent thermal stability of the 3P0–3F2 hypersensitive transition of Pr3+ in Ba(Zr0.16Mg0.28Ta0.56)O3 transparent ceramic, the intensity ratio of the emissions at 624 nm and 649 nm was employed for temperature sensing in an ultra-wide range (293–873 K), and the maximal relative sensitivity reached 1.05% K−1, outperforming most existing luminescence temperature measurement transparent ceramics. Furthermore, in Pr3+-doped Ba(Zr0.16Mg0.28Ta0.56)O3 transparent ceramic, the lifetime of the 3P0–3H4 transition also exhibits prominent optical thermometry performance (303–873 K). The results presented in this work may be of high significance for the design of novel ratiometric/lifetime dual-mode optical temperature sensors in the high-temperature measurement field.
研究领域:
材料科学
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光学工程
·
温度测量技术
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Ningning Zhu,Youqiang Huang,Lili Lang,Xiaolei Yang,Lihui Huang,Gongxun Bai,Shiqing Xu
Lanthanide-doped oxide materials generally require high sintering temperatures for optical applications such as temperature sensing and anti-counterfeiting. In this work, the highly crystalline 1%Pr 3+ /1%Er 3+ co-doped Bi 2 Mo 2 O 9 phosphor is reported with a low sintering temperature of 923 K. Pr 3+ in the Bi 2 Mo 2 O 9 host has a narrow emission band of 3 P 0 – 3 H 6 transition at 624 nm due to the suppressed broadening of electronic transitions in the homogeneous crystal field . Multimode temperature sensing is realized based on the upconversion and downshifting emissions as well as the luminescence lifetimes of the as-prepared phosphor. The temperature sensing based on the downshifting emission bands of this phosphor at 530 and 624 nm achieves the maximum absolute and relative sensitivities of 0.693 K −1 at 568 K and 1.88% K −1 at 483 K, respectively. For anti-counterfeiting applications, this phosphor can display bright yellow fluorescence at the liquid nitrogen cooling temperature, rather than white or pale colors. The white-color emission of this phosphor excited by 254 nm can also be used for lighting. The lanthanide-doped Bi 2 Mo 2 O 9 can achieve favorable luminescence performance at much lower sintering temperature than most oxide phosphors, and is not only stable but also has the potential for in-situ sintering on materials that are not resistant to high temperature.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Yangyang Du,Zhengyuan Jin,Ziyu Li,Tianying Sun,Haotian Meng,Xiaojuan Jiang,Yu Wang,Dengfeng Peng,Jianwei Li,Aiwu Wang,Hua Zou,Feng Rao,Feng Wang,Xian Chen
Visible-to-ultraviolet (UV) upconversion provides a fascinating strategy to achieve deep UV emission through readily accessible visible light. However, the intensity of deep UV emission obtained through visible-to-UV upconversion progress is still far from satisfactory, severely constraining its practical applications. Herein, a novel class of praseodymium ion (Pr 3+ )-doped rare-earth oxyhalides (YOCl, YOBr, and LuOBr) to achieve efficient upconverted deep UV emission in the spectral range of 250–350 nm is developed. The upconverted UV emission intensity of LuOBr:Pr 3+ is determined to be 56.7 times stronger than that of the well-established Lu 7 O 6 F 9 :Pr 3+ . When employed as a photon-converter to activate photocatalytic water splitting reactions, upconverted deep UV emission enables H 2 generation under visible light ( λ > 420 nm) excitation from a xenon lamp. The efficient deep UV upconversion stems from tuning 4 f 1 5 d 1 state of Pr 3+ by oxyhalide constituent which both facilitates the absorption of excitation photons in long-lived intermediate 4 f 2 states and suppress the probability of nonradiative relaxation from 4 f 1 5 d 1 state. These findings not only provide new insights into a mechanistic understanding of the host effect on upconversion process but also make a breakthrough in developing efficient deep upconversion materials that will expand their further applications.
研究领域:
材料科学
·
光子学
·
化学
·
光电
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2024
·Vol. 36
·期 50
·2411804
·
IF 27.4
Huimin Li,Yanmin Yang,Pei Li,Dengfeng Peng,Leipeng Li
Mechanoluminescent materials have broad application prospects in advanced displays, stress imaging, and anti-counterfeiting owing to their ability to convert mechanical stimuli into light. However, most previous studies have focused on the visible and near-infrared regions. Although natural ultraviolet C (UVC) light is nearly absent on the Earth's surface, it plays an important role in many fields. Therefore, the development of smart materials capable of emitting UVC mechanoluminescence (ML) and expanding the application scenarios of UVC ML are significant but challenging. Here the ML property of Sr 2 P 2 O 7 :Pr 3+ is examined, which stems from the 5d→4f transition of Pr 3+ and is located over the UVC region. The peak wavelength of the UVC ML of Sr 2 P 2 O 7 :Pr 3+ is ≈230 nm, which is, to the best of this knowledge, the shortest ML wavelength reported to date. It is further demonstrated that the UVC ML of Sr 2 P 2 O 7 :Pr 3+ is associated with trapped charge carriers and can be conveniently regulated by adjusting the X-ray excitation time. Relying on this unique characteristic, the potential of the UVC ML of Sr 2 P 2 O 7 :Pr 3+ as an indicator of the X-ray radiation dose is demonstrated. This study enriches the family of mechanoluminescent materials and expands the available wavelength of ML to the UVC region.
研究领域:
材料科学
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生物医学工程
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辐射物理
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光学功能材料
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核医学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaocui Rao,Xueting Fu,Hai Jiang,Weiping Li,Laihui Luo
In this work, the cold sintering assisted process was utilized to fabricate dense 0–3 type (1- x )BaTiO 3 - x CaTiO 3 :Pr 3+ ((1- x )BT- x CT:Pr 3+ , x = 0.1, 0.2 and 0.3) binary composite ceramics. Under the combined action of uniaxial pressure and temperature, CT:Pr 3+ has been successfully integrated with BT to form the preliminary BT-CT:Pr 3+ composites during cold sintering. It is found that the cold sintering could increase the grain size a little, and annealing at 900 °C significantly promotes the grain size. The prepared (1- x )BT- x CT:Pr 3+ composite ceramics have a pure phase of CT:Pr 3+ , which is difficult to prepare using high temperature solid reaction method when x < 0.23. It is found that all the composite ceramics exhibit excellent ferroelectric properties . Furthermore, a strong photoluminescence , photo-stimulated luminescence and thermal luminescence properties have been obtained. Present study illustrates a potential approach to combine luminescent and piezoelectric properties into the ferroelectric-based composite ceramics by the cold sintering assisted sintering.
研究领域:
材料科学
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光学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Ye Zhang,Yong Gao,Peng Wang,Yichen Xu,Zhenming Yang,Jinsong Zhang
Membrane contactors have received considerable attention for extraction due to non-dispersive mass transfer through porous membranes. The past decades have seen the rapid development of organic hollow fiber membrane contactors, but very few studies have explored the applications of inorganic membranes in extraction, possibly due to their high costs. In this work, a novel SiC foam material with a hollow skeleton and microporous strut wall was used as a ceramic membrane contactor (HS-FCMC) for rare earths extraction. The foam's structure was characterized by scanning electron microscopy (SEM), X-ray micro-computed tomography (micro-CT), and mercury intrusion porosimetry (MIP). The flow and concentration fields inside and outside the foam cell were simulated by computational fluid dynamics (CFD), and the mass transfer through the ceramic membrane was analyzed. Based on the nitric acid–Ce 3+ /Pr 3+ –P507–kerosene chemical system, the extraction efficiency of Pr 3+ and Ce 3+ using the HS-FCMC reached 96.13% and 92.86%, respectively. A comparison study with poly tetra fluoroethylene (PTFE) hollow fibers was also conducted. The results indicate that the HS-FCMC is suitable for rare earths extraction due to the multiscale porous structure and chemical stability of the hollow-skeleton SiC foam. This research advances the knowledge of inorganic membrane extraction methods.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 45
·17343-17352
·
IF 8.067
Shao Yan,Yanjie Liang,Yi Zhang,Bibo Lou,Jingwei Liu,Dongxun Chen,Shihai Miao,Chonggeng Ma
Solar-blind ultraviolet-C (UVC; 200–280 nm) luminescent materials have exhibited great potential for wide applications in photomedicine and photochemistry due to the unique spectral features of UVC light. However, it is still a challenging work to develop persistent phosphors emitting in the UVC spectral region owing to the lack of suitable host materials and emitting centers. Herein, we report a series of LiLuSiO4:Pr3+,Sm3+ UVC persistent phosphors that can be charged by a 254 nm UV lamp or a high-energy X-ray beam giving rise to long-lasting UVC light emission peaking at 280 nm. More importantly, a considerable enhancement of UVC afterglow intensity and decay time has been achieved by Sm3+ co-doping because the Sm3+ ions can act as effective electron traps, which has been verified by the spectroscopic investigations and first-principles calculations. On top of this, narrowband ultraviolet-B (NB-UVB) persistent luminescence with a line emission at 313 nm has also been realized by introducing Gd3+ into LiLuSiO4:Pr3+,Sm3+ persistent phosphors based on persistent energy transfer from Pr3+ to Gd3+. Considering that the UVC and NB-UVB persistent luminescence can fully avoid severe interference from ambient light, the as-prepared LiLuSiO4:Pr3+,Sm3+ and Li(Lu,Gd)SiO4:Pr3+,Sm3+ persistent phosphors can find promising applications as invisible identification taggants in a bright environment.
研究领域:
材料科学
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光化学
·
医学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yi Zhang,Xihui Shan,Xulong Lv,Dongxun Chen,Shihai Miao,Weili Wang,Yanjie Liang
Discovering multimodal luminescent materials capable of being excited by diverse excitation sources and producing different wavelengths of light emission in a single material system remains a long-standing challenge. Herein, a Pr 3+ single-doped Li 2 CaSiO 4 phosphor is reported as an efficient multimodal luminescence material, which responds to convenient light sources including X-ray tube, 450 nm blue LED/laser, and white LED. Upon X-ray excitation, intense long-lasting red (>24 h) and ultraviolet-C (UVC, >12 h) persistent luminescence can be detected simultaneously, enabling a self-sustained glowing material suitable for working in both dark and bright environments. Significant enhancement of UVC afterglow is observed under the continuous photostimulation of white LED. Moreover, under the excitation of blue light, UVC upconversion luminescence is realized with the aid of unique energy levels of the Pr 3+ emitter. Besides, this material also exhibits exceptional white-to-brown photochromism performance in bright fields only in response to X-ray irradiation, accompanied by excellent bleaching and recovery capability upon thermal or blue light stimulation. The combination of persistent luminescence, photo-stimulated luminescence, upconversion luminescence and photochromism in this integrated multimodal luminescent Li 2 CaSiO 4 :Pr 3+ phosphor provides new and exciting directional solutions for multifunctional applications such as optical information storage and anti-counterfeiting.
研究领域:
材料科学
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光学工程
·
信息存储技术
·
防伪技术
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Zhihao Zhang,Huimin Li,Ran Pang,Wenjing Wang,Da Li,Lihong Jiang,Su Zhang,Hongjie Zhang
Phosphor-converted light emitting diodes (pc-LEDs) are essential for current lighting and display areas because of their unique properties of being uncomplicated, durable and economical. In previous studies, Pr 3+ doped red-emitting phosphors have attracted enormous research interest due to their high color purity. However, their photoluminescence excitation (PLE) spectra are always hard to be combined with LED chips. This mismatch is a great obstacle to achieve Pr 3+ phosphors utilizing in LED devices. Here, to circumvent this issue, Pr 3+ -doped Ca 3 MgTiGe 3 O 12 (CMTG) red-emitting phosphor was optimized with PLE band shifting from 330 nm to 360 nm after tuning with Bi 3+ co-doping based on the structure and phosphorescence properties. The chip-matched excitation makes it a good candidate for white LEDs (wLEDs) fabrication to improve the output quality of device. Meanwhile, the high color purity of 93.02 % was obtained, which is conducive to widening the color gamut of backlight display applications. The photoluminescence (PL) spectra, fluorescence lifetime, and X-ray photoelectron spectroscopy (XPS) analysis were employed and discussed in detail to explain the role of Bi 3+ played in the system. Finally, wLEDs were fabricated with CMTG:Pr 3+ , Bi 3+ , showing a high color rendering index (Ra) of 94.4. And the color gamut covers ∼80 % of the National Television System Committee (NTSC) standard, suggesting great potential for applications of wLEDs and backlight display.
研究领域:
材料科学
·
发光材料
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固态照明
·
显示技术
·
无机化学
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光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Xiaoxuan Fan,Yonggui Zheng,Ran Tao,Lirong Xu,Shanshan Jiang,Hainan Li,Tianya Tan,Shuo Cao,Xuemei Lu,Kexin Wang,Jiwei Wang
Long-afterglow photocatalytic technology offers promising potential for all-weather pollutant treatment, yet its efficiency is often constrained by competition between afterglow emission and photocatalytic reactions. To address this, we developed a Pr 3+ -doped Ca 2 Al 2 SiO 7 (CASO) photocatalyst enriched with oxygen vacancies (V O ). The introduction of oxygen vacancies significantly increases trap concentration, enhancing both the intensity and duration of the afterglow emission. A persulfate-assisted photo-Fenton system was designed based on V O -CASO: Pr 3+ enabling the self-activated degradation of tetracycline hydrochloride (TC) under ultraviolet afterglow. The photo-Fenton reaction consumes excess holes accumulated during the afterglow process, improving carrier utilization efficiency and mitigating rapid recombination. Additionally, persulfate addition can enrich reactive species and facilitate the Fe 2+ /Fe 3+ cycle. Benefiting from these synergistic effects, V O -CASO: Pr 3+ has achieved 75% TC degradation within 1 h, significantly outperforming traditional systems. This study provides a new strategy for enhancing long-afterglow photocatalytic performance, paving the way for sustainable pollutant degradation technologies.
研究领域:
环境科学
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材料科学
·
光催化技术
✓ 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）