CHEMPHYSCHEM
·
2019
·Vol. 20
·期 6
·861-867
·
IF 3.077
Xiaojiao Kang,Wei Lü,Hongcheng Wang,Dongxiong Ling
A series of Ca 9 Ga(PO 4 ) 7 :Ce 3+ /Tb 3+ /Dy 3+ /Mn 2+ phosphors with tunable color, in which Ce 3+ acts as the sensitizer, was synthesized. Energy transfer (ET) from Ce 3+ to Tb 3+ /Dy 3+ /Mn 2+ was investigated in detail. Tb 3+ /Dy 3+ /Mn 2+ single-doped Ca 9 Ga(PO 4 ) 7 can exhibit green, yellow, and red emission, respectively. Incorporating Ce 3+ into a Tb 3+ /Dy 3+ /Mn 2+ single-doped Ca 9 Ga(PO 4 ) 7 phosphor can remarkably promote the luminous efficiency of the Tb 3+ /Dy 3+ /Mn 2+ ions. This enhancement originates from an efficient ET from Ce 3+ to Tb 3+ /Dy 3+ /Mn 2+ . The ET was validated by luminescence spectra, decay dynamics, and schematic energy levels. Moreover, the intensity ratio of red emission of Mn 2+ to violet emission of Ce 3+ was analyzed based on energy-transfer and lifetime measurements. In Ce 3+ -Tb 3+ , Ce 3+ -Dy 3+ , and Ce 3+ -Mn 2+ doped Ca 9 Ga(PO 4 ) 7 , the emitting color changed from violet to green, yellow, and red, respectively, which indicates the potential use of this new tunable phosphor in UV light-emitting diodes. Graphical Energy transfer from Ce 3+ to Tb 3+ /Dy 3+ /Mn 2+ in Ca 9 Ga(PO 4 ) 7 is investigated as a function of the Ce 3+ /Tb 3+ /Dy 3+ /Mn 2+ concentration and based on the photoluminescence emission/excitation spectra and decay curves. Through dual energy transfer, the emitting colors can change to green, yellow, and red from the initial blue color. The results suggest that the material is suitable for UV-white LEDs.
研究领域:
材料科学
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发光材料
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光学性质
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固态化学
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光子学
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DOI
高影响因子
LUMINESCENCE
·
2025
·Vol. 40
·期 12
·e70382
·
IF 3
Fangyu Zhu,Kai Jia,Yixi Guo,Yuqiang Lan,Baoling Wang,Xiujun Deng,Haidong Ju
High-brightness and thermally stable chartreuse-emitting phosphors are highly desirable for high-quality phosphor-converted white light–emitting diodes (pc-LEDs). In this article, a new chartreuse phosphor, Lu (1- x ) Mg 2 Al 3 Si 2 O 12 : x Ce 3+ (LMASO: x Ce 3+ ), was synthesized via a high-temperature solid-state reaction. X-ray diffraction and Rietveld refinement reveal that LMASO phosphors crystallize in the cubic system (Ia 3 ¯ $$ \overline{3} $$ 3 − $$ \overline{3} $$ d). The optimal doping concentration of Ce 3+ in LMASO is 10 mol%, which is higher than that of other Ce 3+ -doped garnet phosphors. Its broad excitation band peaking at 429 nm matches well with the emission from commercial blue LED chips. Under 429 nm excitation, the LMASO:Ce 3+ phosphor exhibits a wide asymmetric emission band ranging from 450 to 650 nm. The high activation energy (0.334 eV) indicates a good thermal quenching resistance. A white LED device was fabricated by combining a 450nm blue LED chip with the LMASO:0.10Ce 3+ chartreuse phosphor and a commercial CaAlSiN 3 :Eu 2+ red phosphor. This device emits bright warm-white light with excellent CIE color coordinates (0.3978, 0.3959), a low correlated color temperature (CCT = 3500 K) and a high color rendering index (Ra = 95.7). The results demonstrate that LMASO:Ce 3+ phosphor is a promising candidate for pc-LEDs.
研究领域:
材料科学
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光电子学
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固态照明
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荧光粉化学
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LED技术
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Zhan Ni,Mengxin Liu,Bo Li,Xinan Shi,Qiulin Cao,Daocheng Pan
LaPO4:Ce3+, Tb3+ nanoparticles with a particle size of 2.7 nm are prepared by a facile room-temperature ligand-assisted coprecipitation method in an aqueous solution. Short-chain butyric acid and butylamine are used as binary ligands and play a critically important role in the synthesis of highly luminescent LaPO4:Ce3+, Tb3+ nanoparticles. The absolute photoluminescence quantum yield as high as 74% can be achieved for extremely small LaPO4:Ce3+, Tb3+ nanoparticles with an optimal composition of La0.4PO4:Ce0.13+, Tb0.53+, which is different from La0.4PO4:Ce0.453+, Tb0.153+ for bulk phosphor. The energy transfer from Ce3+ ions to Tb3+ ions is investigated in sub-3 nm LaPO4:Ce3+, Tb3+ nanoparticles, and Ce3+ ion emission is almost completely suppressed. This room-temperature, ultrafast, and aqueous-phase synthetic strategy is particularly suitable for the large-scale preparation of highly luminescent LaPO4:Ce3+, Tb3+ nanoparticles. LaPO4:Ce3+, Tb3+ nanoparticles (110 g) can be synthesized in one batch, which is perfectly suited to the needs of industrial production.
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 11
·期 2
·488-496
·
IF 8.067
Min-Hang Huang,Qiang-Qiang Zhu,Shuxing Li,Yue Zhai,Hong Zhang,Le Wang,Rong-Jun Xie
The key to developing laser-driven solid-state lighting lies in high-performance color converters, which must be thermally robust under the high-power density excitation of a laser. Phosphor-in-glass (PiG) films are considered as a kind of promising color converter for laser lighting, but the poor thermal dissipation of the glass matrix will cause large thermal quenching of the PiG films and hence low luminous flux of lighting sources. In this work, Al2O3 particles, acting as a heat transfer medium, are introduced into the La3Si6N11:Ce3+ (LSN:Ce3+) PiG film to form a composite color converter for realizing high-brightness laser lighting. By optimizing the ratio of glass frits to Al2O3 as well as the film thickness, the Al2O3–LSN:Ce3+ composite PiG film shows a luminance saturation threshold of 23.08 W mm−2, which is 26.3% higher than that of the Al2O3-free LSN:Ce3+ PiG film (18.27 W mm−2). The luminous flux of the composite PiG film under blue laser excitation is improved by 51.4% and reaches 3120 lm, and the luminous flux of the laser-driven white light can reach up to 2886 lm. It indicates that the Al2O3–LSN:Ce3+ composite PiG film would be an interesting color converter for producing high-brightness laser-driven white light.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
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.
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Yang Liu,Mingfu Zhang,Lijun Xu,Wei Xia
Transparent Ce 3+ :YAG ceramics have great potentials in WLEDs due to their ultra-high thermal endurance property and thermal stability of luminescence. However, it is still a challenging issue to enhance their light extraction ability. In the study, the transparent Ce 3+ :YAG ceramics were fabricated using the uniform Ce:Y 2 O 3 submicron spheres by a solid-state reactive sintering method under vacuum without any sintering additives. The content of the residual pores and grain boundaries, which acted as the “light-scattering centres” to improve the absorption of blue light, were adjusted by changing sintering temperature . The luminous efficacy of the WLED with the sample sintered at 1700 °C was as high as 104.6 lm/W, due to the appropriate quantity of the “light-scattering centres”. The microstructures, transmittance , excitation and emission spectra , luminous characteristics of the samples were studied. The results showed that the preparation progress could significantly enhance the luminous efficacy in the WLED with transparent ceramics.
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Dong Liu,Rundong Wu,Xianjie Wang,Runping Ye,Feiyang Hu,Xiaohan Chen,Tongtong Wang,Bingying Han,Zhang-Hui Lu,Gang Feng,Rongbin Zhang
It is crucial to eliminate CO emissions using non-noble catalysts. Cu-based catalysts have been widely applied in CO oxidation, but their activity and stability at low temperatures are still challenging. This study reports the preparation and application of an efficient copper-doped ceria electrospun fiber catalyst prepared by a facile electrospinning method. The obtained 10Cu–Ce fiber catalyst achieved complete CO oxidation at a temperature as low as 90 °C. However, a reference 10Cu/Ce catalyst prepared by the impregnation method needed 110 °C to achieve complete CO oxidation under identical reaction conditions. Asymmetric oxygen vacancies (ASOV) at the interface between copper and cerium were constructed, to effectively absorb gas molecules involved in the reaction, leading to the enhanced oxidation of CO. The exceptional ability of the 10Cu–Ce catalyst to adsorb CO is attributed to its unique structure and surface interaction phase Cu+-Ov-Ce3+, as demonstrated by a series of characterizations and DFT calculations. This novel approach of using electrospinning offers a promising technique for developing low-temperature and non-noble metal-based catalysts.
研究领域:
催化化学
·
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2018
·
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
·
化学
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DOI
PubMed
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Cheng Xiong,Liyin Bu,Xue Bai,Yongzhong Fu,Quan Wang
Cts/Ce-UiO-66 was developed for sensitive ratiometric detection of Hg 2+ . • Intrinsic Ce 4+ /Ce 3+ redox couple in MOF provides a stable reference signal. • Chitosan coating promotes Hg 2+ enrichment and stabilizes the modified film. • The sensor showed a 3.73 nM LOD and 95.0%–105.3% recovery in pond water. Mercury pollution remains a serious environmental concern because of its toxicity, persistence, and bioaccumulation in aquatic environments. Herein, a ratiometric electrochemical sensor for Hg 2+ detection was developed using a chitosan/Ce-UiO-66 (Cts/Ce-UiO-66) composite. Ce-UiO-66 was used as a redox-active sensing scaffold. Its porous framework may provide accessible interfacial sites that may contribute to Hg 2+ accumulation, while the intrinsic Ce 4+ /Ce 3+ redox response provides a built-in electrochemical signal for internal normalization under controlled measurement conditions. Chitosan was introduced as a film-forming matrix. The amino and hydroxyl groups of chitosan may contribute to Hg 2+ interfacial preconcentration, while the polymer matrix improves the stability of the modified film. The integration of the proposed Cts-assisted Hg 2+ interfacial accumulation and the intrinsic Ce-related normalization signal enabled ratiometric Hg 2+ quantification. Under optimized differential pulse voltammetry conditions, the sensor exhibited a linear response toward Hg 2+ over the concentration range of 0.10–3.00 μM, with a limit of detection of 3.73 nM. The sensor was further evaluated in a fish-pond water sample, achieving recoveries of 95.00–105.33% at the tested spiking levels. These results support the preliminary feasibility of the Cts/Ce-UiO-66-based ratiometric sensor for Hg 2+ determination in the tested fish-pond water matrix under the present experimental conditions. Scheme 1. Schematic illustration of the preparation and sensing processes of Cts/Ce-UiO-66/GCE. Download: Download high-res image (108KB) Download: Download full-size image
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高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
·
2022
·
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
·
生物医学
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
Haoyue Hao,Hongyu Lu,Guanghong Ao,Yinglin Song,Yuxiao Wang,Xueru Zhang
The nearly pure green and red emissions of Ho 3+ /Yb 3+ co-doped Gd 2 (MoO 4 ) 3 were realized by tri-doping Eu 3+ and Ce 3+ , respectively. The Ho 3+ /Yb 3+ co-doped Gd 2 (MoO 4 ) 3 powder, radiating intense green and red emissions, was prepared by a typical sol-gel method. Under the excitation of 980 nm laser, the red-to-green ratio was tuned from 0.2 to 4 as the concentration of Eu 3+ changed from 6 to 0 mol%, attributed to the energy transfer processes between Ho 3+ and Eu 3+ . Meanwhile, the red-to-green ratio altered from 4 to 20 as the concentration of Ce 3+ changed from 0 to 20 mol% via the cross relaxing processes between Ho 3+ and Ce 3+ . The prepared phosphors, possessing large tuning range of red-to-green ratio and resisting high temperature, can be potentially applied to colorful display and solid-state lighting.
研究领域:
材料科学
·
光学材料
·
光子学
·
固态照明
·
显示技术
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DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·Vol. 36
·期 2
·1727-1743
·
IF 3.1
Liu Shili,Yao Xuemei,Zhang Xinyue,Sheng Kai,Wang Chenyi,Zhu Tong,Yu Ruijin,Xing Guoxiu
In this study, a series of Ce 3+ , Eu 2+ , and Ce 3+ /Eu 2+ co-doped oxyapatite Ba 2 La 3 (SiO 4 ) 2 (PO 4 )O (BLSPO) phosphors were synthesized by the high-temperature solid-phase method. The crystal structure, luminescent properties and application prospects of the material were systematically studied. BLSPO crystallizes in the P 6 3 / m space group (No. 176), exhibiting experimentally confirmed high crystallinity. Photoluminescence and excitation spectroscopy analysis indicated that the BLSPO: Eu 2+ phosphor could be effectively excited at 370 nm and was highly suitable for use in LED chips. The emission spectrum of BLSPO: Eu 2+ phosphor shows a broadband emission peak of Eu 2+ ions, with the peak at 510 nm. Through Gaussian fitting, this peak can be further fitted to two different emission centers at 507 nm and 536 nm, corresponding respectively to the M(I) and M(II) coordination environments within the BLSPO matrix. Under 315 nm excitation, the BLSPO: x Ce 3+ phosphor demonstrates a broad emission band peaking around 428 nm, with experimental results identifying 10 mol% as the optimal cerium ion doping concentration for maximal performance. In the BLSPO: Ce 3+ , Eu 2+ co-doped system, the energy transfer mechanism between Ce 3+ and Eu 2+ was studied, and the energy transfer efficiency η value gradually increased from 0% to 86.96% with the increase of Eu 2+ concentration. The mechanism of energy transfer is dipole-dipole interaction mechanisms. The thermal stability of the BLSPO:10 mol%Ce 3+ , 10 mol%Eu 2+ samples was tested, and the sensitivity factors S a and S r reached their respective maximum values of 2.61 × 10 − 2 K − 1 and 0.99% K − 1 at 480 K. The thermal stability test of BLSPO:5 mol%Eu 2+ shows that at 420 K, the sample maintains 52% of its initial luminous intensity. Therefore, the CIE chromaticity coordinates of the green LED packaged with BLSPO:10 mol% Eu 2+ phosphor is (0.263, 0.466), the CIE chromaticity coordinates of the w-LED are (0.335, 0.355), the color rendering index ( R a ) is 92, and the correlated color temperature (CCT) is 5366 K.
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DOI
高影响因子
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