MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Yingxuan Zou,Xiao Min,Zongjian Liu,Lixin Yu,Bingfa Liu
The Ce 3+ -Tb 3+ doped CaSi 2 O 2 N 2 phosphors are successfully obtained via conventional solid-state reaction at normal pressure. Broad absorption bands from Ce 3+ are clearly observed in the excitation spectra of CaSi 2 O 2 N 2 :Tb 3+ , Ce 3+ . The emission spectra present a combination of Tb 3+ and Ce 3+ emission bands, and the emission intensity of Ce 3+ is decreased along with the enhancement of the emission intensity of Tb 3+ . The energy transfer from Ce 3+ to Tb 3+ in the CaSi 2 O 2 N 2 host is confirmed to be resonant type via a dipole–dipole interaction mechanism. It is also found that the luminescence intensity of the Tb 3+ -Ce 3+ doped CaSi 2 O 2 N 2 phosphors prepared in N 2 /H 2 atmosphere is stronger than that prepared in pure N 2 .
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Qikai Ren,Shuaishuai Wang,Haoyu Liu,Xing Zhang,Yanran Cui,Gui-Rong Zhang,Lei Nie,Donghai Mei
The dry reforming of methane (DRM) serves as a pivotal reaction for hydrogen generation and the simultaneous conversion of methane and carbon dioxide, two major greenhouse gases, into syngas that can further be converted into high-value fuels and chemicals. However, catalyst deactivation imposes a major challenge that prohibits the market penetration of DRM. Here we reported a series of bifunctional Ni-Ce catalysts supported on SSZ-13 (Ni-Ce-SSZ-13) and discovered that a small amount of Ce could significantly enhance the activity, selectivity, and stability for DRM. Optimal ratio of Ni to Ce has been identified to yield peak catalytic performance. The optimal performance is correlated with the maximum Ce 3+ /Ce 4+ ratio as revealed by XPS analysis, which implies an increased presence of oxygen vacancies in the catalysts. It played a crucial role in facilitating the oxidation of activated CH 4 species at Ni sites, thereby enhancing DRM activity and diminishing the detrimental coke formation. It is also disclosed that integrating proper amount of Ce fosters its interactions with Ni, effectively preventing the agglomeration of Ni sites. This work presents great implications for the rational design and catalytic synergy of bi-/multi-functional zeolite catalysts for other technological applications.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Juan Du,Zhaolin Wang,Ziming Wei,Jiawei Yao,Haipeng Song
This paper investigated the preparation of new environmental, pH stimulation response nanocontainer enhanced, self-healing, and efficient anti-corrosion coating for aluminum alloy protection. Silane/Ce-ZSM-5 coating with improved morphology was successfully synthesized on aluminum alloy surface, through the new proposed “hydrothermal crystallization - ion exchange - self-assembled seed growth - hot pressing” technology, in which ZSM-5 molecular sieve was served as pH stimulation response nanocontainer. The corrosion resistance and self-healing ability of the coating in 3.5 wt% NaCl solution were further investigated by the combined analysis of SEM, EIS, LEIS , ICP-MS characterization and 3D microscopic observation. The experimental results showed that the prepared silane-Ce-ZSM-5 coatings exhibited excellent corrosion protection and self-healing ability, which was attributed to the pH stimulation release of corrosion inhibitor Ce 3+ when the coatings were damaged. The ZSM-5 zeolites generated Ce(OH) 3 or CeO 2 precipitates to gradually fill the aluminum alloy defects, thus forming a dense protective layer and inhibiting the corrosion activity.
研究领域:
材料科学
·
腐蚀与防护
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 4
·3679-3683
·
IF 1.338
Li Suwen,Huang Qingqing,Jiang Yi,Hu Min
A series of Ce3+-Yb3+ co-doped CaF2 nanoparticles were prepared by a hydrothermal synthesis method. The structure, morphology, photoluminescence properties, and fluorescence dynamics were studied systemically. Under the excitation of the 5d level of
Ce3+, an efficient energy transfer from Ce3+ to Yb3+ occurred, and the efficient near-infrared emission at 900–1050 nm matching to the energy of Si band gap of Si-based solar cells was observed. The lifetime of Ce3+ decreased, and the inner
quantum efficiency increased with increasing Yb3+ concentration. The quantum efficiency dependent on Yb3+ concentration was calculated, and the maximum efficiency approached 186%. As a down-conversion luminescent convertor, this kind of material can be used in front of
Si-based solar cells to reduce thermalization loss and enhance conversion efficiency of solar cells.
研究领域:
材料科学
·
光物理学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·Vol. 46
·期 4
·4511-4518
·
IF 3.45
Quansheng Wu,Ziyu He,Qiang Huang,Quan Zhao,Penghui Zheng,Dongfeng Xiang,Jianyan Ding,Jiangcong Zhou
Rare earth activated lithium-containing alkaline earth silicates is an intensely studied topic in the fields of luminescent materials . In this study, a cerium-activated lithium-silicate blue phosphor, Li 2 Ca 2 Si 2 O 7 :Ce 3+ , was explored using structural computational simulations and systematic experiments. The Li 2 Ca 2 Si 2 O 7 :Ce 3+ phosphor can be efficiently excited by near-ultraviolet and cathode ray light sources . According to the spectroscopic redshift theory, time-resolved photoluminescence (TRPL) and cathodoluminescence (CL) spectra, it is determined that the broad emission of Li 2 Ca 2 Si 2 O 7 :Ce 3+ comes from two different luminescent centers. In addition, Li 2 Ca 2 Si 2 O 7 :Ce 3+ exhibits strong blue emission at ~415 nm with high quantum yield and stable emission under high temperature and continuous electron beam bombardment . Therefore, this study provides a new insight into developing new high-efficiency and high-purity trichromatic phosphors.
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Xiaojiao Kang,Chuanyu Jia,Hongcheng Wang,Yongshan Xiao,Wei Lü
In this paper, we have synthesized a series of ultraviolet-emitting Ca 9 In(PO 4 ) 7 :Ce 3+ ,Tb 3+ and Ca 9 In(PO 4 ) 7 :Ce 3+ ,Dy 3+ phosphors. The Ca 9 In(PO 4 ) 7 :Ce 3+ phosphor exhibits bright blue emission under UV excitation. The Tb 3+ /Dy 3+ single doped Ca 9 In(PO 4 ) 7 can exhibit weak green and yellow emission, respectively. Based on the efficient energy transfer from Ce 3+ to Tb 3+ /Dy 3+ , the luminous efficiency of Tb 3+ /Dy 3+ in Ca 9 In(PO 4 ) 7 :Ce 3+ ,Tb 3+ and Ca 9 In(PO 4 ) 7 :Ce 3+ ,Dy 3+ can be remarkably promoted. The effects of Ce 3+ /Tb 3+ /Dy 3+ concentration, decay curves, PL emission and excitation spectra on the energy transfer from Ce 3+ to Tb 3+ /Dy 3+ in Ca 9 In(PO 4 ) 7 were investigated. The experimental results demonstrated that the energy transfer efficiency could reach 21.77 and 30.3% in Ca 9 In(PO 4 ) 7 :Ce 3+ ,Tb 3+ and Ca 9 In(PO 4 ) 7 :Ce 3+ ,Dy 3+ , respectively. This study suggests that the synthesized Ca 9 In(PO 4 ) 7 :Ce 3+ ,Tb 3+ and Ca 9 In(PO 4 ) 7 :Ce 3+ ,Dy 3+ compounds have potentials to be used as white light-emitting phosphors in UV light-emitting diodes.
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Meng Lei Su,Qi Zhang,Yong Jing Gao,Da Xiao Wang,Chang Chen,Wei Wei
CsPbBr 3 nanocrystals-glass composite scintillators based on Ce 3+ -doped borosilicate glass were prepared by melt-quenching method with further heat-treatment. Incorporating Ce 3+ into borosilicate glasses matrix , highly enhanced green emission was observed under 365 nm ultraviolet and X-ray excitation. The transmittance of the prepared CsPbBr 3 nanocrystals-glass is as high as 80% at 527 nm, fluorescence lifetime is 21.6 ns, and the luminescent quantum efficiency reaches up to 28% after thermal treatment (550 °C, 12 h). Compared with undoped CsPbBr 3 nanocrystals-glass, the X-ray excited luminescence intensity of Ce 3+ doped CsPbBr 3 nanocrystals-glass is around 190%, which indicates that the issue of absorbing ray energy in glass matrix can be effectively solved by incorporation of Ce 3+ ions.
✓ 已验证
DOI
高影响因子
OPTIK
·
2022
·
IF 2.84
Zhiyuan Cheng,Tong Liu,Hao Lin,Tian Shi,Zhiqi Ye,Shenghong Yang,Yueli Zhang
Eu 3+ was ideal red emitter due to its efficient red emitting transitions 5 D 0 → 7 F j and Ce 3+ was most common sensitizer due to its strong parity-allowed absorption bands . However, direct sensitization of Ce 3+ on Eu 3+ (SCE) in hexagonal NaYF 4 was very weak and unpractical. In this work, rate equations were introduced to elaborate the details of energy transfer (ET) among Ce 3+ , Gd 3+ and Eu 3+ in NaYF 4 , and how the SCE was much enhanced. The pure hexagonal phase of all samples were guaranteed by powder XRD patterns and SEM images, despite the morphology was influenced by rare earth components. While increasing Eu 3+ concentration over 0.03, SCE was drastically dimished; on the contrary, it could be 60 folds enhanced by tri-doping Gd 3+ ions. The rate equations of sensitizers were established and solved by calculating the lifetimes. It was found out that, while increasing Gd 3+ concentration to 0.4, ET Ce→Gd could compete against ET Ce→Eu to capture 73.8% of energy absorped by Ce 3+ , which strongly favored SCE. The solution also revealed that SCE originated from ET chain Ce→Gd→Eu was much more efficient than direct SCE from ET Ce→Eu, which originated the significant enhancement.
研究领域:
材料科学
·
发光材料
·
稀土掺杂
·
光物理
·
纳米光学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 6
·4242-4251
·
IF 3.5
Shuya Wang,Wenzhi Sun,Tingting Zhao,Chunqing Fu,Xiaoyan Fu,Hongwu Zhang
In this paper, X-ray-activated super long persistent ultraviolet A luminescence from Ca 3 (PO 4 ) 2 : Ce 3+ has been observed. The crystal structure analysis has shown that the as-prepared samples are pure β-Ca 3 (PO 4 ) 2 phases with rhombohedral structure and R 3 c space group. The photoluminescent spectra of the samples all consist of a broad band in 340–400 nm UVA1 region, which is assigned to the 5d 1 –4f 1 electronic transition of Ce 3+ ions. More important, under the 3 min X-ray irradiation, Ca 3 (PO 4 ) 2 : Ce 3+ show super long persistent luminescence in the UVA1 region, which can persist for more than 16 h. And its afterglow intensity after 16 h decay is still 4.10 times stronger of the back ground intensity. Furthermore, only 10 s X-ray irradiation can induce excellent long persistent UVA luminescence of Ca 3 (PO 4 ) 2 : 0.08Ce 3+ , which can persist for more than 5 h and afterglow emission intensity is about 3.03 times of the background intensity. The trap analysis has confirmed that the different X-ray irradiation time do not create new traps and there is the same trap with 0.75 eV trap depth existing even under the extremely low X-ray dose (10 s X-ray irradiation). Furthermore, under 10 s X-ray irradiation, the thermoluminescence (TL) intensity of Ca 3 (PO 4 ) 2 : 0.08Ce 3+ still reaches 0.32 times of the initial TL intensity even after 120 min, which thus leads to the super long persistent luminescence. Thus, the large amounts of trapped electrons induced by the high energy X-ray irradiation are the principal cause for super long persistent UVA luminescence of Ca 3 (PO 4 ) 2 : Ce 3+ .
研究领域:
材料科学
·
发光材料
·
光学物理
·
辐射探测
·
荧光粉研究
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 8
·e71060
·
IF 4.2
Haoyan Zhang,Canrong Luo,Huairen Cui,Zaijin Fang,Hong Jia
Developments for high light yield and high density of Ce 3+ -doped glass scintillators are of fundamental importance for practical applications in fields of nuclear medical imaging and high-energy physics. Here, a series of Ce 3+ -doped glass scintillators was designed. The glasses exhibit broadband emissions around 380 nm, and the photoluminescence quantum yield (PL QY) reaches 78.63%. By adjusting the Gd 2 O 3 /GdF 3 ratios of the glasses, the properties such as density, light yield, and transmittance of glass scintillators are all modulated. The optimized glass GSG 3 (Gd 2 O 3 :GdF 3 = 1:1) exhibits superior performance, including a high density of 5.562 g/cm 3 , high transmittance of 93% at 400 nm, a high light yield of 2859 ph/MeV, and an energy resolution of 19.3%@662 keV. The X-ray imaging system utilizing a self-developed glass scintillator was employed to acquire clear images of objects such as metal springs and integrated circuit chips, and achieved a spatial resolution of 14 lp/mm. The designed glass provides a low-cost scintillator for potential applications in medical imaging and radiation detection. This study also offers a powerful solution to conquer the conventional contradictions of glass scintillators between density and light yield.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Yunhe Zhang,Xuelong Li,Duoyu Zhou,Hanghang Kang,Li Li,Wansheng Zong,Jianhua Liu,Fengyang Yu,Lina Su
Constructing beneficial heterostructured interfaces in cathode materials represents an effective strategy for enhancing cathodic oxygen reduction reaction kinetics in intermediate-temperature solid oxide fuel cells (IT-SOFC). Herein, a novel heterostructured nanocomposites Pr 0.5 Ce 0.1 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ -CeO 2 (PCSCF-C1) was designed by substituting partial Pr 3+ (1.013 Å) with larger Ce 3+ (1.34 Å) ions, coupled with a redox-induced phase transformation (Ce 3+ →Ce 4+ ). Specially, the in situ -engineered heterointerface introduces a 1.15% lattice tensile strain, which weakens the B-O bonding energy, increases oxygen vacancy concentration, and accelerates the surface oxygen exchange rate through synergistic effects. As a result, the PCSCF-C1 cathode exhibits a low polarization resistance ( R p ) of 0.020 Ω·cm 2 at 800 °C in LSGM-based symmetric cells, together with improved CO 2 tolerance. When integrated into an anode-supported single cell, it delivers a maximum peak power density of 2.29 W·cm −2 at 800 °C and maintains stable operation over 248 h at 750 °C. This work demonstrates a lattice strain-engineered heterostructure design for advancing high-performance IT-SOFC cathodes.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
You Zhang,Kun Zhao,Haoyu Zhu,Qiong Xi,Nian Fu,Dawei Wang,Jinxing Zhao,Li Guan,Yunfei Zhuang,Xu Li
White light-emitting diodes (WLEDs) have emerged as a leading technology for healthy lighting and advanced displays. Nevertheless, the poor thermal stability of blue-emitting components remains a significant bottleneck, hindering their broader adoption in demanding environments. Here, we have prepared a series of Ca 3 Al 2 O 6 :Ce 3+ phosphors by high temperature solid-state method. Substituting the [Al 3+ –O 2- ] ionic pair with [Si 4+ –N 3- ] in the Ca 3 Al 2 O 6 host lattice via a charge-compensated strategy achieves a 1.75 times enhancement in thermal stability compared to the pristine material, while simultaneously inducing a blue-shifted emission spectrum (Δλ = 30 nm). The enhanced thermal stability originates from increased lattice rigidity, while the blue spectral shift arises from modulated crystal field splitting decrease. These mechanistic insights provide a foundational strategy for designing ultra-stable blue phosphors compatible with high-power WLED applications.
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）