MATERIALS LETTERS
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2024
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IF 2.7
Xue Xing,Weiwei Cao,Zhaoxin Wu,Xiaohong Bai,Jiarui Gao,Xiaozhen Liang,Bo Wang,Chao Wang,Dalian Shi,Linwei Lv,Yonglin Bai
A series of ZnS 0.75 O 0.25 :0.1%Ce 3+ , x %Tb 3+ phosphors were prepared by high temperature solid state reaction method. These phosphors exhibited two mixed phases consisting of hexagonal phase ZnS and hexagonal phase ZnO with the average particle size of 13.83 μm and emitted blue-green light. The luminescence mechanism consisted of Zn vacancy defects, the 5d 1 → 2 F 5/2 radiative transitions of Ce 3+ , the 5 D 4 → 7 F 5 and 5 D 4 → 7 F 6 radiative transition of Tb 3+ induced by the energy transfer of Ce 3+ → Tb 3+ . An equation for the variation of the fluorescence lifetime of ZnS 0.75 O 0.25 :0.1%Ce 3+ , x %Tb 3+ phosphors with concentration of Tb 3+ fraction was obtained by exponential fitting. The short fluorescence lifetime could be tuned within the range of 113 μs to 550 μs with the increase of Tb 3+ concentration, and the color was tunable from blue to blue-green, which is of important application in the field of high-energy particle detection.
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
ACS Omega
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2018
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IF 0
Dan Li,Guannan Wang,Liming Cheng,Cuiping Wang,Xifan Mei
Aggregation-induced emission has provided fluorescence enhancement strategies for metal nanoclusters. However, the morphology of the aggregated nanoclusters tended to be irregular due to the random aggregated route, which would result in the formation of an unstable product. Herein, copper nanoclusters were directly synthesized by using l-cysteine as both the reducing and protection ligand. Initially, the structure of the product was irregular. Furthermore, Ce3+ was introduced to re-arrange the aggregates through a crosslinking avenue. It was interesting to find that well-ordered three-dimensional nanomaterials with mesoporous sphere structures were obtained after re-aggregation. On the basis of the stability test at a relatively high temperature and the light-emitting diode fabrication investigation, it revealed that the regulated product demonstrated more promising stability and color purity for practical applications than the random aggregated product with irregular structures.
研究领域:
材料科学
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化学
✓ 已验证
DOI
PubMed
CERAMICS INTERNATIONAL
·
2025
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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
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Qinjiang He,Renli Fu,Xiufeng Song,Haitao Zhu,Xinqing Su,Chaoqun You
Herein, Ce 3+ and Ce 3+ /Dy 3+ co-doped Ca 3 Al 2 O 6 phosphors have been designed and synthesized via a facile citrate-based sol-gel technique, and their structural, photoluminescence properties and energy transfer phenomenon were investigated comprehensively. The XRD analysis indicated that pure Ca 3 Al 2 O 6 phase can be synthesized at low temperature (1000 °C) for merely 2 h. The photoluminescence spectra showed the dominant emission of Ce 3+ singly doped phosphors is located in the blue region even at low Ce 3+ doping level, which indeed favors the energy transfer from Ce 3+ to other luminescent centers. When Dy 3+ is co-doped into Ca 3 Al 2 O 6 :Ce 3+ phosphors, the remarkable sensitizing effect of Ce 3+ on Dy 3+ is validated by comparatively analyzing the excitation, emission spectra and average lifetimes of the series of samples. Through the concentration quenching theory, the critical distance between Ce 3+ and Dy 3+ is calculated to be 13.50 Å. Furthermore, the energy transfer mechanism between them is most likely ascribed to electric dipole-dipole interaction. In virtue of the variation of the emission intensities of Ce 3+ and Dy 3+ , the emitting colors of Ca 3 Al 2 O 6 :Ce 3+ , Dy 3+ phosphors can realize tunable luminescence from deep blue to bluish-white region through controlling the Dy 3+ content. Based on these analysis, Ca 3 Al 2 O 6 :Ce 3+ , Dy 3+ phosphors could potentially be applied as a single-phase color-tunable phosphors pumped by near-ultraviolet (n-UV) radiation.
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 THE EUROPEAN CERAMIC SOCIETY
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2024
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IF 5.8
Cong Wei,Jian Kang,Cen Shao,Pengfei Sang,Tianyuan Zhou,Mingzhou Li,Fan Qiu,Baolin Jiang,Rongyu Xu,Wieslaw Strek,Hao Chen,Zhiru Ren,Le Zhang
The key to realizing the applications of ceramic based laser lighting devices depends on the heat management capability of color converters. In order to sufficiently absorb the blue light and smoothen the temperature gradient of luminescent ceramics, multistage gradient doping Ce 3+ :Y 3 Al 5 O 12 (Ce:YAG) transparent ceramics (TCs) with five different concentrations were designed, including 0.01 at%, 0.05 at%, 0.1 at%, 0.2 at% and 0.4 at% Ce. The composite green bodies were prepared by aqueous tape casting and multistage gradient doping Ce:YAG TCs, with concentrations from low to high, were fabricated by vacuum sintering. The in-line transmission values at 800 nm of composite structure Ce:YAG TCs could reach 80.3%. Under 21.13 W/mm 2 blue laser excitation, the gradient doping Ce:YAG TC (1.32 mm) realized a high luminous efficacy of 280.3 lm/W, which was 15.8% higher than that of 0.15 at% Ce:YAG TC (240.27 lm/W). Finally, during lighting process, the input-output temperature differences (T in -T out ) between excitation surface and light-exit surface of 0.15 at% Ce:YAG TC was 5 ℃, while that in gradient doping TC reduced by 50% (2.5 ℃). The results indicate that the multistage gradient doping Ce:YAG TCs will be an interesting color converter for high-power and energy-saving laser-driven lighting.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2025
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IF 4.7
Wei Lv,Yan Gao,Qingguang Zeng,Xinxin Han,Tao Hu
The discovery of efficient green phosphor is of great interest in wide range of applications in lighting, display, scintillator, and temperature sensing. Herein, an innovated Ce 3+ -substituted green-emitting gallate phosphor is presented. The green emission in CaYGaO 4 :Ce 3+ originates from Ce 3+ occupying at octahedrally coordinated Y 3+ site rather than Ca 2+ site. This preferential substitution is identified by DFT-based formation energy calculations and supported by Rietveld refinement and photoluminescence spectra. The Ce 3+ ion experiences a strong crystal field splitting on the 5d states, and ultimately shifts the emission into green spectra region with dual emission band at 508 and 588 nm (λ ex = 460 nm). The phosphor exhibits excellent thermal quenching property, as its integrated photoluminescence intensity at 150 °C and 250 °C can retain 72.33 % and 54.11 % of that at room temperature, respectively, resulting from the reduced nonradiative losses. A prototype WLED fabricated by coating the green emitting CaYGaO 4 :Ce 3+ phosphor and red emitting CaAlSiN 3 :Eu 2+ phosphor onto a blue LED chip yields a warm light with uniform light distribution. And also, by utilizing the fluorescent intensity ratio of the two emission bands as a temperate index, the promising application of the phosphor for remote temperature sensing is also demonstrated.
研究领域:
材料科学
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光学
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温度传感技术
✓ 已验证
产品关联
DOI
高影响因子
Small Structures
·
2024
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IF 13.9
Kaina Wang,Jipeng Fu,Hongliang Dong,Bingyu Huang,Jinru Liu,Long Tian,Jing Feng,Chunzhen Yang,Chenjie Lou,Ligang Xu,Tianyi Sun,Huajie Luo,Shiqing Xu,Guowei Yin,Hongjie Zhang,Mingxue Tang
Near-infrared (NIR) phosphors have been widely used in biomedical applications based on their deep tissue penetration. However, the lack of blue-pumped NIR phosphors with emission ranges beyond 1000 nm has greatly limited the development of NIR phosphor-converted light-emitting diodes (pc-LEDs). Herein, a facile way to boost the luminescence efficiency and thermal stability by introducing the promoters of Ce 3+ and Na + into Nd 3+ -doped SrS NIR phosphor is demonstrated, thus achieving light emitting at 850–1500 nm with a peak wavelength of ≈1070 nm. Through sensitization by the allowed 4 f → 5 d transition of Ce 3+ , the SrS: Nd 3+ phosphors are excitable by using a commercial blue LED, attributing to the effective energy transfer between Nd 3+ and Ce 3+ . Besides, the structural analysis and density functional theory calculations reveal the lattice distortion mechanism and geometry of doping ions contributed to the weakened thermal quenching effect and the increasing of internal quantum efficiency. The optimized NIR phosphor luminescence intensity remains at 91.8% of the initial intensity at 393 K, and the internal quantum efficiency increases to 42.8% from 31.7% of the sample without Na + doping. The present exploration of Nd 3+ -doped NIR phosphors will provide a reference for designing NIR pc-LEDs with enhanced properties.
研究领域:
材料科学
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生物医学工程
✓ 已验证
DOI
高影响因子
Science Bulletin
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2019
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IF 6.277
Yang An,Yuanyuan Liu,Hongtao Bian,Zeyan Wang,Peng Wang,Zhaoke Zheng,Ying Dai,Myung-Hwan Whangbo,Baibiao Huang
UiO-67 is a Zr-based metal–organic framework (MOF) containing an organic linker namely, the dianion of biphenyl-4,4′-dicarboxylic acid (bpdc). Ce 4+ metal ions (0.02 Ce to Zr atom ratio) were incorporated into UiO-67 via partially replacing bpdc with the dianion of 2,2′-bipyridine-5,5′-dicarboxylic acid (bpydc); thus, the latter forms a bpydc-Ce complex. The resulting product (i.e., UiO-67-Ce) demonstrated a photocatalytic hydrogen evolution rate that was over 10 times higher than that of UiO-67. Through this modification, a new energy transfer channel is opened up. The energy transfer between the bpdc and bpydc-Ce ligands (i.e., from excited bpdc to bpydc-Ce) weakened the recombination of the charge carriers, which was confirmed by photoluminescence, emission lifetime, and transient absorption measurements. This study presents a new way to construct highly efficient MOF photocatalysts.
研究领域:
材料科学
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化学
✓ 已验证
DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2022
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IF 7.129
He Mei,Jianping Wang,Xiaolei Zhu,Juan Sun,Wei Shi,Huili Wang,Shugen Qu,Xuedong Wang
A novel ratiometric fluorescent probe was constructed for sensitive assay of hydrogen peroxide (H 2 O 2 ) and glucose, which utilized the synergistically enhanced effects of Ce 3+ and Fe 2+ on copper nanoclusters (CuNCs) and coumarin. In the CuNCs-Ce 3+ /Fe 2+ -coumarin system, Ce 3+ triggered the aggregation-induced emission phenomenon of CuNCs, and Fe 2+ catalyzed the Fenton reaction to efficiently yield hydroxyl radical (•OH). In the presence of H 2 O 2 , the 625-nm red fluorescence of CuNCs was sharply quenched owing to the oxidation of CuNCs to Cu(II) by •OH, but the 460-nm blue fluorescence of 7-hydroxycoumarin from the oxidation of coumarin by •OH dramatically increased. Based on the reversible changes in two fluorescence signals, a satisfactorily ratiometric probe was constructed for H 2 O 2 assay with a detection limit (LOD) of 0.6 μM accompanied by a visual color variation from red to blue. For glucose assay, this ratiometric probe gave a linear range of 3.2–160 μM and LOD of 0.96 μM owing to the oxidization of glucose to yield H 2 O 2 in the presence of glucose oxidase and O 2 . Overall, the newly developed ratiometric probe shows a great prospect in real applications for visual assay of H 2 O 2 and glucose by our naked eyes.
研究领域:
分析化学
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生物医学
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2020
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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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
·
IF 5.7
Xinyu Ping,Bin Meng,Xiaohua Yu,Qingqing Yang,Zhiyuan Ma,Xiaoyu Pan
A new nine-principal cation high-entropy oxide of (Y 1/9 La 1/9 Nd 1/9 Sm 1/9 Yb 1/9 Lu 1/9 Eu 1/9 Gd 1/9 Ce 1/9 ) 2 O 3 (9HEO) was synthesized by co-precipitation method combined with conventional sintering at 1600 °C for 10 h. Two samples of 9HEO-(Ce 3+ ) and 9HEO-(Ce 4+ ) were obtained by adjusting the valence state of Ce element in 9HEO. The ratio of Ce 3+ to Ce 4+ in 9HEO-(Ce 3+ ) and 9HEO-(Ce 4+ ) is approximately 2:1 and 14:15, respectively. These two samples have the same bixbyite structure and similar microscopic morphology. Their relative density, thermal expansion coefficient, hardness and Young’s modulus are close. The higher ratio of Ce 3+ /Ce 4+ in 9HEO-(Ce 3+ ) leads to the expansion of its lattice volume and the decrease of thermal conductivity (κ) compared with 9HEO-(Ce 4+ ). In addition, the κ values of these two samples are lower than those of Y 2 O 3 and (Eu 0.2 Er 0.2 Lu 0.2 Y 0.2 Yb 0.2 ) 2 O 3 , which have a bixbyite structure and lower entropy. 9HEO-(Ce 3+ ) and 9HEO-(Ce 4+ ) show higher oxygen barrier property compared with Y 2 O 3 -stabilised ZrO 2 .
研究领域:
材料科学
·
热物理性能
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2025
·
IF 7.3
Ning Li,Linzi Zuo,Fanchao Xu,Xiaolei Qu,Heyun Fu,Huiting Liu
Cerium sulfide (Ce 2 S 3 ) pigment is an environmentally friendly novel inorganic red-colored metal pigment, representing a potential alternative to traditional heavy metal pigments. In this study, we report concurrent re-precipitation and photo-dissolution of cerium sulfide pigment in a sunlit aquatic phase. Commercial cerium sulfide pigment transforms into its re-precipitation product, CeCO 3 OH, along with the generation of H 2 S gas in its re-precipitation process. Simultaneously, cerium sulfide pigment photo-dissolution results in a significant release of Ce ions. After 4 hours of simulated sunlight irradiation, the particle size of cerium sulfide pigment significantly reduces, and 10.4% of elemental Ce is released into the solution as free Ce ions. The key photo-dissolution mechanism is the oxidation reaction between photogenerated holes and the crystal lattice of the pigment. Cerium sulfide pigment and its re-precipitation product, CeCO 3 OH, can be excited by specific wavelengths in the solar spectrum, mediating the pigment photo-dissolution. UV light shielding can inhibit the cerium sulfide pigment photo-dissolution. Superoxide and hydroxyl radicals are generated during the photoreaction process, in which the hydroxyl radical may oxidize the photo-induced released Ce(III) to Ce(IV) and the re-precipitation-generated H 2 S to SO 4 2- . Our research indicates that commercial cerium sulfide pigment undergoes a series of transformation processes in aquatic environments, potentially posing certain environmental risks.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）