Nanomaterials
·
2020
·Vol. 10
·期 9
·1639
·
IF 4.324
Zhigang Sun,Bin Lu,Guiping Ren,Hongbing Chen
A translucent Gd2O2S:Pr ceramic scintillator with an in-line transmittance of ~31% at 512 nm was successfully fabricated by argon-controlled sintering. The starting precipitation precursor was obtained by a chemical precipitation route at 80 °C using ammonia solution as the precipitate, followed by reduction at 1000 °C under flowing hydrogen to produce a sphere-like Gd2O2S:Pr powder with an average particle size of ~95 nm. The Gd2O2S:Pr phosphor particle exhibits the characteristic green emission from3P0,1→3H4transitions of Pr3+at 512 nm upon UV excitation into a broad excitation band at 285–335 nm arising from 4f2→4f5dtransition of Pr3+. Increasing Pr3+concentrations induce two redshifts for the two band centers of 4f2→4f5dtransition and lattice absorption on photoluminescence excitation spectra. The optimum concentration of Pr3+is 0.5 at.%, and the luminescence quenching type is dominated by exchange interaction. The X-ray excited luminescence spectrum of the Gd2O2S:Pr ceramic is similar to the photoluminescence behavior of its particle. The phosphor powder and the ceramic scintillator have similar lifetimes of 2.93–2.99 μs, while the bulk material has rather higher external quantum efficiency (~37.8%) than the powder form (~27.2%).Keywords:Gd2O2S;Pr3+doping;ceramic scintillator;phosphor powder
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 22
·2300911
·
IF 9
Binli Xiao,Puxian Xiong,Sheng Wu,Dongliang Jiang,Kang Chen,Yao Xiao,Peishan Shao,Yinzhen Wang
Mechanical luminescence (ML) is the conversion of mechanical energy into light energy when a material is subjected to a force. It is challenging to develop ML materials with tunable luminescent properties by single ion doping, which have broad application prospects in the fields of stress sensing and dynamic signature anticounterfeiting. In this study, a Pr 3+ doped Sr 2 Ga 2 GeO 7 tunable ML material is reported. Due to the traps resulting from unequal substitution of Pr 3+ –Sr 2+ in [SrO 6 ] heptahedra, the deep/shallow traps redistribution occurs towards a multicolor ML from red to green. In addition, even after continuous friction sliding force (15 N), the ML intensities can be recovered after ultraviolet pre-irradiation, indicating that Sr 2 Ga 2 GeO 7 : Pr 3+ has excellent ML emission stability. Based on thermoluminescence analysis, potential PersL and ML mechanisms are further elaborated by a lattice engineering (trap regulation) strategy. In all, the development of single-ion doped multicolor ML materials may have crucial research value and show a variety of potential applications in the fields of anticounterfeiting and information encryption.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xuelian He,Hang Zhang,Feiyan Xie,Chaochao Tao,Hualan Xu,Shengliang Zhong
High luminescence intensity and long persistent duration is desired for practical application of long persistent materials. But it still remains challenging due to insufficient phosphors to meet the commercial request and a general lack of understanding of luminescence mechanism. In this work, green persistent luminescent phosphor Zn 2 SiO 4 :Mn 2+ ,Pr 3+ was first synthesized by traditional solid-state reaction method with self-made SiO 2 submicrospheres as silicon source. The morphology, crystal structure, photoluminescence and the long afterglow performance have been investigated systematically. Interestingly, the longest persistent luminescence is observed for 0.025 Mn 2+ , 0.001 Pr 3+ co-doped Zn 2 SiO 4 with a persistent time of ∼2640 s at (0.32 mcd/m 2 ), which is 20 times longer than those of Zn 2 SiO 4 host or single Mn 2+ doped Zn 2 SiO 4 phosphors. The possible persistent mechanism has been discussed. The finding will be beneficial for developing persistent phosphors with superior functionalities.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 13
·4492-4499
·
IF 6.4
Xulong Lv,Xihui Shan,Yi Zhang,Yanjie Liang
Photostimulated luminescence (PSL) materials have attracted considerable attention in many important fields, varying from radiation dosimetry and biomedical imaging to security encryption and optical data storage. Nevertheless, monochromatic light illumination is usually used as the stimulus source to realize the absolute separation between the PSL signal and the excitation light. Furthermore, a dark environment is considered necessary to get rid of the interference from polychromatic ambient light. Herein, we report a glow-in-the-daylight material, YBO3:Pr3+, which can emit intense and long-lasting ultraviolet-C (UVC) persistent luminescence in a bright indoor lighting or outdoor sunlight environment after ceasing X-ray excitation. We note that although the YBO3:Pr3+ phosphor shows very weak UVC afterglow in darkness, remarkable enhancement of UVC persistent luminescence can be observed in a bright ambient light environment. The UVC persistent luminescence peaking at 274 nm can last for more than 24 h under the illumination of 900 lux white LED light, and the UVC luminescence signal is free from the interference of the ambient light. This enhancement of UVC persistent luminescence is assigned to the continuous and efficient photostimulation of polychromatic ambient light, which has been confirmed by comprehensive spectroscopic investigations. The appealing glow-in-the-daylight phenomenon from the YBO3:Pr3+ phosphor will not only lay the foundation to develop more UVC persistent phosphors suitable for working in a bright environment, it will also promote the widespread use of these storage phosphors across a broad range of applications such as microbial inactivation and optical tagging.
研究领域:
材料科学
·
光学工程
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yushan Deng,Xi Ouyang,Manwen Yao,Xi Yao
Heterovalent ion doping has influenced the further development of piezoelectric applications. Pr 3+ doping in relaxor ferroelectrics is rarely focused on piezoelectric performance enhancement. 0.51 Pb(Ni 1/3 Nb 2/3 )O 3 -0.49 Pb(Hf 0.3 Ti 0.7 )O 3 (PNN-49PHT) ceramics with Pr 3+ doping ceramics were designed and fabricated by a two-step precursor method. Excellent dielectric diffusion coefficient ( γ ) of 1.96 was achieved at the low Pr 3+ doping concentration of 0.2 %. Increased relaxation enhanced the nanoscale domains formation, resulting in a giant strain response ( d* 33 ) of 1400 pm/V at 10 kV/cm, and a total strain ( S tol ) of 0.27 % at 20 kV/cm. Structural refinement unveiled that the high piezoelectricity originated from the mainly substitution of Pr 3+ for Pb 2+ at the A-site, inducing lattice distortion and phase transitions. Local domain switching and long-range ordered destruction were investigated by piezoresponse force microscopy (PFM) and Scanning Electron Microscopy (SEM). These findings contribute to the advancement of piezoelectric devices and provide valuable insights for the design and optimization of high-performance piezoelectric ceramics .
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2024
·Vol. 130
·期 8
·1-13
·
IF 2.5
Xie Zhuojia,Xu Changji,Jiang Xinyu,Zhang Weijian,Feng Min,Zhong Shenglin,Zou Zhengguang
With the growing attention to perovskite materials in the field of magnetic refrigeration. In this work, La 0.8−x Pr x Sr 0.2 MnO 3 (x = 0.05, 0.10, 0.15) (LPSMO) samples were synthesized through the sol–gel method. The effects of Pr 3 ⁺ doping on the structure, morphology, and magnetization of LPSMO were investigated. The XRD analysis revealed that the LPSMO samples have a rhombohedral structure within the R-3c space group. As the amount of Pr 3 ⁺ doping increased, the cell volume decreased. The magnetic properties of LPSMO exhibited a transition from ferromagnetic (FM) to paramagnetic (PM) near the Curie temperature (Tc), with Tc decreasing as the Pr 3 ⁺ doping level increased. The second-order magnetic phase transition of LPSMO near Tc was confirmed by employing the MPMS. The maximum magnetic entropy change ( \(-\Delta {S}_{M}^{max}\) ) of LPSMO is 4.92 J/(kg·K) (x = 0.05), 5.13 J/(kg·K) (x = 0.10) and 5.04 J/(kg·K) (x = 0.15) when the external magnetic field (H) = 5 T, separately. Meanwhile, the relative cooling power ( RCP ) of LPSMO are 283.88, 276.71, and 289.60 J·kg −1 , respectively. The experiments indicate that LPSMO has promising application prospects.
研究领域:
材料科学
·
磁制冷技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Superconductivity and Novel Magnetism
·
2022
·Vol. 35
·期 9
·2473-2484
·
IF 1.675
Li Pengwei,Li Jie,Zhang Wenhao,Wang Yonglun,Yao Kai
Pr-doped M-type barium ferrite with a composition of Ba 1− x Pr x Fe 12 O 19 (0.00 < x < 0.25) was prepared via solid-state sintering combined with high-energy ball milling. The structures, spectra, morphologies, and magnetic properties of Pr 3+ -substituted Ba hexaferrites were analyzed herein. Under high-energy ball milling, the material produces crystal vacancy defects for elemental doping. The X-ray diffraction results showed that the hexagonal crystal structure was affected when the Pr content ( x ) was > 0.20. The GSAS refinement results show that the synthesized samples were good. The scanning electron microscopy results and Fourier transform infrared (FT-IR) spectra of the tetrahedral and octahedral sites (FT-IR result of the Fe–O bond = 601 and 448 cm −1 peaks, respectively) of the prepared material proved the formation of a hexagonal crystal structure. The magnetic properties of the samples were measured using a vibrating sample magnetometer at room temperature, and the obtained results demonstrated that the coercivity increased with an increase in the doping amount (from 3815.03 at x = 0 to 4600.56 kOe at x = 0.25). At the same time, the saturation magnetization maintained its high value (> 72.568 emu/g), which is beneficial for preparing permanent magnets.
研究领域:
材料科学
·
磁学
✓ 已验证
产品关联
DOI
高影响因子
APL Materials
·
2024
·Vol. 12
·期 9
·
IF 5.3
Shen Tiantian,Zhao Shanshan,Su An,Liu Haisheng,Chen Fayi,Li Benchun,Han Xinxin,Yu Dechao,Zhang Dawei
The Pr 3+ ion has been widely doped into various materials as a red and near-infrared (NIR) emitting center for applications in lighting and solar spectrum downconversion. Herein, the preparation of a new library of Pr 3+ -doped Sr 2 Al 2 GeO 7 phosphors was proved by powder x-ray diffraction patterns and Rietveld refinements and characterized by a scanning electron microscope with energy-dispersive x-ray spectrometry. The Sr 2 Al 2 GeO 7 :Pr 3+ sample strongly absorbs blue photons over 420–500 nm and yields intense visible emissions with dominant peaks around 490 nm from the Pr 3+ 3 P 0 → 3 H 4 transition, as well as robust NIR emission bands over 800–1200 nm. In addition to the typical transitions of 1 D 2 → 3 F 2 at 880 nm, 1 G 4 → 3 H 4 at 1000 nm, and 1 D 2 → 3 F 3,4 at 1070 nm, the distinguishable NIR emission at 929 nm was demonstrated from the 3 P 0 → 1 G 4 transition via static and dynamic spectroscopic analysis. Most interestingly, for the 3 P 0 blue-excited state, a considerably elevated concentration of about 10%Pr 3+ was optimal for the visible/NIR emissions, in stark contrast to the diluted optimal 1%Pr 3+ for the 1 D 2 state. The relevant cross-relaxation from the 3 P 0 and 1 D 2 states between Pr 3+ was comprehensively treated by theoretical speculations and experimental results. Such concentrated Pr 3+ blue activators would significantly facilitate the blue-to-NIR downconversion through a desired two-step sequential transition from the 3 P 0 initial state to the 1 G 4 intermediate level for quantum efficiency exceeding unity. The current results would consolidate the basis of concentrated Pr 3+ donors to promote the novel Pr 3+ /Yb 3+ codoping downconversion for greatly increasing Si solar cell efficiency.
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 ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Luhui Zhou,Peng Du,Quan Zhang,Jiujun Zhu,Yafei Hou,Laihui Luo,Weiping Li
The Pr 3+ -doped Ba 0·77 Ca 0·23 TiO 3 ferroelectric ceramics , which were sintered by means of a high-temperature solid-state reaction technology, were prepared. The Rietveld X-ray diffraction refinement and Raman spectrum proved that the resultant compounds had tetragonal phase. With the addition of Pr 3+ ions, the highest remanent polarization of the resultant ceramics was nearly two times higher than that of the pure Ba 0·77 Ca 0·23 TiO 3 ceramics. With the aid of a theoretical calculation based on the temperature-dependent dielectric constant, it is found that the synthesized compounds pertained to the relaxor-like ferroelectrics . Furthermore, through the piezoresponse force microscopy technique, the effect of Pr 3+ ions doping on the domain structure of the Ba 0·77 Ca 0·23 TiO 3 ferroelectric ceramics was studied. Additionally, the prepared ferroelectric ceramics can exhibited the characteristic emissions of Pr 3+ ions when excited by 450 nm light. The strongest emission intensity was achieved when the dopant content was 0.5 mol% and the dipole-quadrupole interaction contributed to the relevant concentration quenching mechanism.
研究领域:
材料科学
·
物理学
✓ 已验证
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
·
光化学
·
医学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 8
·3862-3872
·
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
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Xinwen Liu,Guolong Tan,Zhiwei Zhou,Weiwei Li,Yu Yang,Zaichun Sun,Bingchu Mei
As one of the quickest inorganic scintillators, BaF 2 crystal is projected to be used in medical treatment, high energy physics, geological research, and other sectors. A series of Pr:BaF 2 polycrystalline transparent ceramics with nominal Pr 3+ concentrations (0.1–5 at%) were synthesized via HP sintering in this research. XRD , FE-SEM, and TEM measurements were used to analyze the phase composition and microstructure of BaF 2 precursor powders with varying Pr-doping levels, and the results demonstrated that as concentration increases, the size of the nanopowders decreases. Furthermore, the morphology shifted from uniform square to uneven sheet. Cross-sectional SEM pictures of all samples revealed a clean grain boundary with no remaining pores or contaminants. The absorption spectra , emission spectra, and fluorescence lifetime of a group of Pr:BaF 2 transparent ceramics with excellent optical transmittance were measured and discussed after hot-pressing the precursor powders synthesized via co-precipitation method at 900 °C under an axial pressure of 50 MPa for 4 h.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）