Crystals
·
2021
·Vol. 11
·期 11
·1328
·
IF 2.589
Daini Wang,Wenxia Wu,Xiaojun Tan,Bernard A. Goodman,Shoulei Xu,Wen Deng
As a development on previous research on single crystals of Pr3+-doped yttria-stabilized zirconia (YSZ), we report here the preparation and optical properties of Yb/Pr co-doped YSZ single crystals with different Yb2O3concentrations. Results from X-ray diffraction (XRD) and Raman spectroscopy indicated that all of the crystal samples had a cubic phase structure, and transmission was ≥88% in the 550–780 nm range. Photoluminescence (PL) under excitation with a 980 nm laser showed upconversion emission, and several peaks were observed centered on 448 nm, 508 nm, 525 nm, 542 nm, 617 nm and 656 nm. The effects of excited state absorption (ESA), energy transfer upconversion (ETU), cross relaxation (CR), and cooperative energy transfer (CET) on the upconversion luminescence and energy transition mechanism in YSZ crystals were further studied. The fluorescence lifetime of the3P0→3H5transition at 542 nm reached 207 μs, which shows that the samples are of potential use for laser and fluorescence output.Keywords:optical floating zone method;yttria-stabilized zirconia (YSZ) single crystal;Pr/Yb co-doped;upconversion luminescence
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 LUMINESCENCE
·
2022
·
IF 4.171
Zuodong Liu,Qilong Shen,Yue Cao,Siya Li,Xue Chen,Jiashun Wang,Yongsheng Yu,Bingchu Mei,Qiangshan Jing,Peng Liu
Pr, La:SrF 2 ceramics co-doped with various amounts of LaF 3 were fabricated by hot-pressing (HP) sintering in a vacuum environment. The transmittance of the Pr, La:SrF 2 ceramics was gradually improved with the increase in sintering temperature , and the sintering temperature of 1000 °C was adequate to fabricate highly transparent ceramics without rapid grain growth. Residual pores and undissolved PrF 3 /LaF 3 fluorides were identified as light scattering defects within the ceramic sintered at 830 °C. The effect of LaF 3 on the microstructural, transmittance, and spectroscopic characteristics of ceramics was studied systematically. The luminescence intensity of the Pr, La:SrF 2 ceramics was drastically enhanced through LaF 3 co-doping, while the optical transmittance first slightly increased and then decreased. The ceramic sample co-doped with 1 wt% LaF 3 exhibits the highest transmittance with the smallest grain size of 43.4 μm, and the transmittance reaches 87.8% at 400 nm and 87.2% at 1100 nm.
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
JOURNAL OF LUMINESCENCE
·
2020
·
IF 3.28
Weimin Dong,Yingjie Sun,Qian Yao,Lintao Liu,Qingbo Wang,Hang Wen,Jing Li,Xinguang Xu,Jiyang Wang,Robert I. Boughton
Single crystal Pr(BO 2 ) 3 with centimeter size was grown successfully by a flux method using 3Li 2 CO 3 -2H 3 BO 3 as a flux. The absorption spectrum , emission spectrum , and luminescence lifetime of the Pr(BO 2 ) 3 crystal were measured. The crystal has a relatively large absorption cross section and full widths at half maximum (FWHM), which is advantageous for energy absorption from a pumping source. The spectrum parameters were calculated based on Judd–Ofelt (J-O) theory, and the effective J-O parameters were determined to be: Ω 2 = 37.47 × 10 20 cm 2 , Ω 4 = 6.80 × 10 20 cm 2 , and Ω 6 = 1.05 × 10 20 cm 2 . Furthermore, the emission cross section for the 3 P 0 → 3 F 2 transition at 650 nm was calculated to be 13.6 × 10 −19 cm 2 . The fluorescence lifetime of the 3 P 0 level was obtained to be 4.5 ns. The Raman spectrum of the crystal was also analyzed in detail. Physical properties such as thermal and chemical stability, hardness, and cleavage properties were explored. The refractive index and electronic structure were calculated by the first-principles method.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Xiu-Zhen Yang,Tian-Qi Zhao,Renagul Abdurahman,Shi-Ji Liu,Yao-Xing Han,Yue Zhang,Xue-Bo Yin,Jie Gao
Fluorescence intensity ratio (FIR) technique demonstrates significant potential for non-contact temperature sensing with rapid response time, while the design of FIR probes is particularly intriguing. Herein, we report Pr–Al co-doped MgGa 2 O 4 persistent luminescence nanoparticles (PLNPs), as MgAl 0.04 Ga 1.96 O 4 : 0.1 % Pr 3+ (MAGP), for ratiometric temperature sensing application. Pr 3+ ions function as the emission centers for dual-emission at 612 and 494 nm, while Al 3+ ions adjust the lattice environment around Pr 3+ ions to enhance the luminescence. Consequently, 274 nm excitation induces the emissions at 494 and 612 nm, as the transitions of Pr 3+ for 3 P 0 → 3 H 4 and 1 D 2 → 3 H 4 , respectively. The emission mechanism is substantiated by density functional theory calculations, regarding the electronic transitions of Pr 3+ . Ratiometric temperature sensing is achieved over the temperature range of 303–573 K with the thermally non-coupled mechanism of the 3 P 0 / 1 D 2 energy levels by FIR at 612 and 494 nm, respectively. The maximum relative sensitivity was 0.91 %. The mechanism is corroborated as the non-thermally coupled energy levels through intervalence charge transfer. Thus, the reversible and sensitive response was illustrated for temperature measurement and the non-thermally coupled mechanism is efficient for the design of ratiometric temperature sensors.
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
·
2013
·
IF 1.789
Huiquan Li,Yumin Cui,Wenshan Hong,Suhua Fan,Liangjun Zhu
Pr/In/Nd composite oxides with different Pr/In/Nd ratios were successfully prepared using a simple solid state reaction at 873 K. The composites were characterized by X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area measurements, photoluminescence (PL) spectra and UV–vis diffuse reflection spectroscopy (UV–vis DRS). The photocatalytic activity of Pr/In/Nd composite oxides was investigated by the degradation of methyl orange (MO) in an aqueous solution under UV and visible light irradiation. It is found that compared with pure In 2 O 3 , the absorption intensity of the Pr/In/Nd composite oxide (Pr/In/Nd=1:8:1) increases in the 200–800 nm light region and the absorption edge has a shift to longer wavelength. In addition, the Pr/In/Nd composite oxide (Pr/In/Nd=1:8:1) shows higher UV and visible light photocatalytic activities than pure In 2 O 3 . The remarkably enhanced photocatalytic activities could be mainly attributed to the fact that proper introduction of Pr 2 O 3 and Nd 2 O 5 increased the BET surface area of In 2 O 3 , improved the separation efficiency of photogenerated electrons and holes, and enhanced the absorption intensity in 200–800 nm light region. The effect of various radical scavengers on the degradation of MO showed that OH, O 2 − , h + and H 2 O 2 , especially O 2 − , jointly dominated the photodegradation process of MO under UV light irradiation.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Agronomy-Basel
·
2024
·Vol. 14
·期 1
·156
·
IF 3.3
Zuguo Xi,Huiyan Jia,Yifan Li,Jinqing Ma,Mengqian Lu,Zhihui Wang,Dexu Kong,Wei-Wei Deng
Tea is a healthy beverage made from the leaves of the tea plant [Camellia sinensis(L.) O. Kuntze]. The tea plant is a perennial evergreen plant that is widely distributed in tropical and subtropical regions. PR proteins (pathogenesis-related proteins, PRs) are defense-related proteins induced under pathogenesis-related conditions. Currently, there are a few studies on PRs in plants. Tea leaf color mutants have been of wide interest to scientists as special materials. A tea plant displaying variegated spontaneous albinism found in a local tea plantation in Huangshan City, Anhui Province, China, was used as the material sample in this study. An analysis of preexisting transcriptomic and proteomic data revealed the significant upregulation of three classes of PRs. In order to investigate the correlation between PRs and variegated tea plants, a series of studies were conducted onPRgenes. The results revealed the identification of 17CsPR1, 3CsPR4and 31CsPR5genes in tea plants using bioinformatics methods, and their structures and promoter sequences. The expression of threePR1, twoPR4and onePR5genes was determined to be induced in stress treatment experiments involving mechanical damage, insect bites, low temperature treatment, and fungal infections. Additionally, the ribonuclease activity of CsPR4 was successfully verified. This is the first study to report the ribonuclease activity of CsPR4 in tea plants. The results can serve as a reference for future studies on PRs in tea plants, offering new insights into information on albinism in tea plants.Keywords:identification;function analysis;pathogenesis-related protein;variegated tea plants
研究领域:
植物生物学
·
分子生物学
·
基因组学
·
植物病理学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ruiying Zhai,Yijie Yang,Peilin Lei,Jiahao Lu,Sisi Chen,Xiaoqi Sun
In this article, a green pigment Bi 1.95-x Pr x W 0.05 MoO 6+δ (x = 0.1–0.5) co-doped with Pr and W was developed using high temperature solid-phase synthesis method. The microstructure, color performance, and optical characteristics of the novel pigment was analyzed using x-ray diffraction instrument (XRD), field-emission scanning electron microscopy (FESEM), L∗ a∗ b∗ color date, and ultraviolet–visible–near infrared light spectrophotometer. The results indicate that all the samples possess a monoclinic structure, characterized by the space group P21/c(14). Compared to Bi 2-x Pr x MoO 6+δ doped solely with Pr 6 O 11 , the Pr/W co-doped Bi 2 MoO 6 pigment demonstrates superior green coloration. The solar reflectance in the near-infrared region of all pigment samples exceeds 80 %, highest value reaches 92.82 %. In thermal insulation tests, the temperature difference between the Bi 1.95-x Pr x W 0.05 MoO 6+δ pigment coating and a blank galvanized sheet reaches up to 10.3 °C after 60 min under infrared lamp irradiation. The color difference Δ E∗ of the pigment powder after immersion in acid and alkali solution and high-temperature calcination are less than 5, indicating good chemical stabilities in acidic, alkaline and high-temperature environments. To our knowledge, Bi 1.95-x Pr x W 0.05 MoO 6+δ has the highest reflectivity among green pigments without toxic metals.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
De-hua Wang,He-bin Li,Hong-wei He,Yang Deng,Ye Lu,Le Zhang,Ke-qing Ruan,Xiao-xiong Wang
Piezoelectric catalysis has become an emerging research field in recent years, which has received extensive attention. Nanoparticles and nanowires have been developed as piezoelectric catalytic materials. However, in practical research, the use of nanoparticles is not easy for the recovery of samples and will cause secondary pollution, and the current piezoelectric catalysis requires the help of high-frequency ultrasound, which increases the consumption of extra energy and cannot be applied on a large scale. In this study, a self-supporting macroscopic flexible inorganic (Ba,Ca)TiO3:Pr nanofiber membrane was successfully prepared by electrospinning. Natural energy (water flushing) was used to drive the flexible inorganic (Ba,Ca)TiO3:Pr nanofiber membrane for piezoelectric catalytic degradation of organic dyes. The results show that the flexible inorganic (Ba,Ca)TiO3:Pr nanofiber membrane driven by water washing has an obvious piezoelectric catalytic degradation effect on dyes. When the water flow rate was 450 L/h and the concentration of CR solution was 10 mg/L, the catalytic efficiency can reach 91.69%. This study provides a green and feasible method for the preparation of flexible inorganic piezoelectric catalytic materials and the catalytic degradation of organic dyes.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2013
·
IF 3.548
Ying Wang,Jun Peng,Chen Zhou,Zi-Yian Lim,Chunzheng Wu,Shuang Ye,Wei Guo Wang
Ni/ x Pr-Al 2 O 3 ( x = 5, 10, 15, 20 wt%) catalysts with an application in autothermal reforming of methane were prepared by sequential impregnation synthesis; its catalytic performance was evaluated and compared with that of Ni/γ-Al 2 O 3 catalyst; the physicochemical properties of the catalysts were characterized by X-ray diffraction (XRD), Transmission electron microscope (TEM), X-Ray Photoelectron Spectrometer (XPS), Thermo Gravimetric Analyzer (TGA) and H 2 -temperature programmed reduction techniques (TPR). The results showed that Pr addition promoted the reduction of nickel particle size on the surface. TPR experiments suggested a heterogeneous distribution of nickel oxide particles over x Pr-Al 2 O 3 supports and the promotion of NiO reduction by Pr modification. The CH 4 conversion increased with elevating levels of Pr addition from 5% to 10%, then decreased with Pr content from 10% to 20%. For the stability catalytic tests, Ni/ x Pr-Al 2 O 3 catalysts maintained the high activity after 48 h while Ni/Al 2 O 3 had a significant deactivation.
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
MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Enming Zhao,Xiaodan Liu,Dongyang Tang,Lu Liu,Guangyu Liu,Bao Zhou,Chuanxi Xing
To date, the white light lanthanide upconvertion consisting of RGB components usually originated from more than one type of emitter. Alternatively, Pr 3+ is a fascinating lanthanide ion featuring multiple visible emission bands, including RGB components that in principle enable Pr 3+ to emit white light. In this paper, we report, for the first time to our knowledge, white light upconversion through dual sensitization routes in Nd/Yb/Pr triply doped NaYF 4 microrods upon 800 nm excitation. It is found that the dual sensitization is more efficient than single sensitization for Pr 3+ upconversion. In addition, the temperature sensing behaviors of the proposed triply doped microrods are comparatively investigated using different emission bands. This work presents a novel white light emitting material upon 800 nm excitation, and further demonstrates the feasibility of multichannel thermometry using the proposed material.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jian Fang,Xi Chen,Rong-Pu Xiao,Jing-Jing Xue,Ji-Ming Song
Metal-organic framework (MOF) can be used as sacrificial templates for preparing metal oxides with unique hollow structures. The heterojunction formed between two metal oxides is conducive to improvement of gas sensor performance. Herein, MOF compounds containing In with hexagonal prism morphology were synthesized first, and then annealed to obtain uniform hexagonal In 2 O 3 hollow microtubes. Subsequently, the surface of In 2 O 3 hollow microtubes was decorated by the Pr-doped SnO 2 nanoparticles (NPs) in solution under stirring, and the Pr-SnO 2 /In 2 O 3 composite was obtained. Various characterization techniques confirmed the successful preparation of the Pr-SnO 2 NPs/In 2 O 3 composite. The specific surface area of the composite reached 72.07 m 2 /g. The sensing performance of the SnO 2 , Pr-SnO 2 , In 2 O 3 , SnO 2 /In 2 O 3 , and Pr-SnO 2 /In 2 O 3 sensors to ethanol gas were systematically investigated. Among these sensors, at the optimal working temperature, the Pr-SnO 2 /In 2 O 3 sensor displayed the best sensing performance with a response value of 75 towards 50 ppm ethanol, and further exhibited good linearity coefficient, selectivity, reproducibility, and long-term stability.
研究领域:
材料科学
·
化学传感器
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Yu Zhang,Keke Xu,Bo Zhang,Shundong Guan,Xiuli Fu,Zhijian Peng
Enhancing the hydrogen evolution reaction (HER) performance of electrocatalysts is essential for developing clean energy, in which doping is one of the most effective ways. In this work, praseodymium-doped NiCoP nanowire arrays grown on nickel foam (Pr-NiCoP NWAs/NF) as electrocatalysts were synthesized through hydrothermal reaction and low temperature phosphating. The subsequent tests revealed that the introduction of Pr can modulate the morphology, density of the active sites and electrical conductivity of the NiCoP NWAs/NF. Thereby, the Pr-NiCoP NWAs/NF realized the fast reaction kinetics and exceptional HER performance. When the additive molar amount of Pr is 10%, Pr-NiCoP NWAs/NF electrode exhibited the highest electrocatalytic activity. Its overpotential corresponding to current density of 10 mA•cm −2 were 91 and 88 mV in 0.5 mol•L −1 H 2 SO 4 and 1 mol•L −1 KOH, the Tafel slope of which were 45.5 and 69.2 mV•dec −1 , respectively. Further, this work provides a promising strategy to explore highly efficient HER electrocatalysts.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 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）