INFRARED PHYSICS & TECHNOLOGY
·
2021
·
IF 2.638
Yuxin Pan,Hui Lin,Ruijin Hong,Dawei Zhang,Haojie Sun
A series of Yb 3+ , Ho 3+ , Ce 3+ :YAG ceramics have been sintered at 1780 °C by high temperature solid state reaction under oxygen atmosphere. The absorption spectra , fluorescence spectra and fluorescence decay curve were discussed. The Judd-Ofelt (J-O) theory was applied to obtain the values of Ω 2 = 13.95 × 10 −20 cm 2 , Ω 4 = 3.94 × 10 −20 cm 2 and Ω 6 = 0.87 × 10 −20 cm 2 , respectively. After doping the Ce 3+ ions, the σ em of Yb 3+ , Ho 3+ , Ce 3+ :YAG ceramic at 2094 nm increased from 5.67 × 10 −20 cm 2 to 7.26 × 10 −20 cm 2 . These results demonstrate that Yb 3+ , Ho 3+ , Ce 3+ :YAG ceramic could be promising for 2 μm region.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Da Cai,Zhiyuan Cheng,Tong Liu,Jinyuan Zhang,Fuhua Gao,Tian Shi,Shenghong Yang,Yueli zhang
Sm 3+ is one of the most fascinating activators because of its dominate emissions in visible region with abundant potential applications. However, its absorbing cross section and ability to be sensitized are ineffective and unpractical due to the low quenching concentration. In this work, a series of β-NaYF 4 : Ce 3+ /Gd 3+ /Sm 3+ were synthesized. Pure hexagonal phase of all samples was guaranteed by powder XRD patterns and SEM images, despite the morphology was influenced by rare earth components. The luminescence properties of β-NaYF 4 : Ce 3+ /Gd 3+ /Sm 3+ were systemically investigated by the photoluminescence excitation spectra, emission spectra and life time decay curves. Tri-doping Gd 3+ into β-NaYF 4 was found to be very helpful to enhance the sensitization of Ce 3+ on Sm 3+ . Furthermore, the rate equation of sensitizers was induced to analyze details of competition between ET Ce → Gd and Ce → Sm. Rate equation analysis also indicated that the enhancing effect of Gd 3+ on sensitization is mainly due to the greatly improved energy utilization 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 NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 11
·7561-7565
·
IF 1.354
Wang Kang,You Fangtian,Peng Hongshang,Huang Shihua
All-inorganic cesium lead halide perovskites have attracted a lot of attention as the promising optoelectronic materials because of their excellent and controllable optical and electric properties. The photoluminescence (PL) properties of undoped and Ce3+ doped CsPbCl3
quantum dots (QDs) at different temperatures were studied. The peak wavelength, the intensity of the PL spectra and the full width of half maximum of host QDs emissions present monotonous changes corresponding to the variation of temperature in the range from 22 to 62 °C. Doping with Ce3+
leads to another photoluminescence peak arising from Ce3+ emission. The introduction of Ce3+ ions changed the host QDs emission properties and temperature-dependent characteristics. With the temperature increasing, the emission of host QDs decreased sharply while the
emission of Ce3+ decreased slowly. The florescence intensity ratio between the emission intensities of CsPbCl3 QDs and Ce3+ were calculated to obtain the maximal values of absolute and relative sensitivities of CsPbCl3:Ce3+ QDs. The results
show the potential use of the CsPbCl3 QDs doped with Ce3+ for luminescent thermometers.
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 RARE EARTHS
·
2012
·
IF 0.901
Aimei CHEN,Qingshan SHI,Yousheng OUYANG,Yiben CHEN
This study aimed to delineate the antibacterial mechanism of rare-earth ion Ce 3+ to the target organism Escherichia coli cell, and the most important purpose was to identify its biological effect of increasing the E. coli cell membrane permeability. The antibacterial activities of Ce 3+ to E. coli cells were tested, and then the permeability of outer membrane (OM) and inner membrane (IM) were studied by N-phenyl-1-naphthylamine (NPN) and o -nitrophenyl-β-D-galactopyranoside (ONPG) methods separately. Through these experiments we concluded that the E. coli cells grown to log phage were more sensitive to Ce 3+ than the ones not at this stage; the structure of membrane was destroyed and the permeability of both OM and IM was obviously increased by Ce 3+ ; there should be certain interactions between Ce 3+ and some proteins inside the cell, which impeded the physiological activities of bacteria.
研究领域:
微生物学
·
分子生物学
·
生物化学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Xiaohui Lai,Zhiyong Fang,Jian Zhang,Bo Wang,Wenfeng Zhu,Rui Zhang
A novel BaLu 2 Al 2 Ga 2 SiO 12 :Ce 3+ persistent phosphor was designed and synthesized through hetero-valence substituting Ba 2+ -Si 4+ ion pair for Lu 3+ -Al 3+ one in the Lu 3 Al 3 Ga 2 O 12 . XRD and Rietveld refinement results confirm the garnet typed crystal structure. SEM information shows that the constituent elements are uniformly distributed on the irregular particles. Under 360 or 430 nm excitation, the samples exhibit broad emission bands peaking at 510 nm. The luminescence intensity reaches to the maximum at 6 mol% Ce 3+ doping content, and an internal quantum efficiency of 51.2% is achieved. The concentration quenching between Ce 3+ ions is mainly originated from exchange interaction. Moreover, the phosphors exhibit bright cyan afterglow for minutes after removing the blue-light excitation source. The persistent luminescence decay process is studied by thermoluminescence spectra. The persistent luminescence mechanism and optical information writing and reading process are also discussed to explore the application in optical information storage.
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
·
2025
·
IF 3.6
Yingnan Dong,Yumeng Jia,Kenan Xu,Xu Sun,Jing Wang,Zhongxiang Shi,Yanchen Liu
In order to expand the multi-scene application of rare earth doped luminescent materials in the field of blue light illumination, a series of Ce 3+ doped Na-β″-Al 2 O 3 phosphors were prepared by solid-state method with Na-β″-Al 2 O 3 as matrix. The crystal structure, micro-morphology, optical properties and thermal stability were investigated systematically. The results show that the activated ion Ce 3+ in the prepared Na-β″-Al 2 O 3 : x Ce 3+ phosphor replaces the Al 3+ (CN = 6) lattice in the crystal, and with a outstanding blue light emission. In addition, the thermal stability of Na-β″-Al 2 O 3 : 0.05Ce 3+ phosphor is analyzed by variable temperature spectrum, and its luminescence intensity at 573K can reach 71.55 % at room temperature. Finally, Na-β″-Al 2 O 3 : 0.05Ce 3+ phosphors are packaged with 330 nm n-UV LED chips to obtain high quality blue LED devices. With its high color rendering index (81.60), low color temperature (2886 K) and good color consistency, it provides a theoretical basis for the application of Na-β″-Al 2 O 3 -based phosphors in blue LED devices, and makes it show great application potential in the field of solid-state blue spectral lighting.
研究领域:
材料科学
·
固体化学
·
发光材料
·
照明工程
·
无机功能材料
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Meihua Wu,Haichao Wei,Ximing Huang,Qiyun Liu,Shengzhi Duan,Yifei Liu,Ruiyu Mi,Xin Min,Zhaohui Huang,Wen Zhang,Peng Cao
Plant growth can be controlled and freed from natural environmental interference through indoor plant cultivation. Artificial light sources with better quality are required to promote indoor plant growth. In this study, we used a simple high-temperature solid-state reaction to synthesize high-efficiency Ce3+-activated NaGdSiO4 (NGSO) phosphors. X-ray diffraction and Rietveld refinement were performed to determine the detailed crystal structure of the NGSO:Ce3+ phosphors. The morphology of NGSO:Ce3+ and the elemental state of Ce3+ were measured and analyzed. Under near-ultraviolet (n-UV) light excitation, the Ce3+-activated NGSO phosphors exhibit a broad emission band from 375 to 500 nm, and their emission peaks are at approximately 401 nm. This asymmetrical blue emission band is caused by the spin-allowed 5d → 4f transition of Ce3+ and overlaps well with the blue absorption region of carotenoids and chlorophyll. The temperature-dependent luminescence spectra were utilized to assess the thermal stability of NGSO:Ce3+. The external quantum efficiency (EQE) was measured to be 60.91%, and the internal quantum efficiency (IQE) was measured to be 73.39%. A blue LED device assembled from the NGSO:Ce3+ phosphor has demonstrated the application potential in accelerating plant growth.
研究领域:
材料科学
·
植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Energy
·
2020
·
IF 5.604
Qi Sun,Shaoying Wang,Liangling Sun,Jia Liang,Balaji Devakumar,Xiaoyong Huang
At present, near-ultraviolet-pumped white light-emitting diodes (LEDs) based on tri-color (blue, green, and red) phosphors still suffer from insufficient color rendering index (CRI), due to the presence of cyan gap in the 480–520 nm spectral range. To solve this problem, it is urgent to develop an efficient cyan phosphor with emission peak around 490 nm and absorption band in the near-ultraviolet range of 380–420 nm. Herein, a highly efficient cyan-emitting Ca 2 GdHf 2 (AlO 4 ) 3 :Ce 3+ (CGHA:Ce 3+ ) garnet phosphor with internal quantum efficiency as great as 80% is reported. Impressively, the CGHA:1%Ce 3+ sample showed a broad excitation band ranging from 350 to 470 nm with a maximum at 408 nm, and upon 408 nm excitation it exhibited an intense broad cyan emission band in the 420–700 nm wavelength range with peak at 489 nm and a full width at half-maximum of 103 nm. Importantly, by applying the newly discovered cyan-emitting CGHA:1%Ce 3+ phosphors as color converter, the CRI value of the fabricated warm-white LED device is greatly enhanced from 80.5 to 91.6. This work demonstrates that the novel developed CGHA:Ce 3+ cyan phosphors could compensate for the cyan gap and realize full-visible-spectrum lighting, which have a bright prospect in high-quality solid-state white lighting.
研究领域:
材料科学
·
光学工程
·
固态照明
✓ 已验证
产品关联
DOI
高影响因子
Chinese Physics B
·
2025
·
IF 1.5
Rui-Qiang Song,Chuang Liu,Yi-Yang Long,Ji-Feng Han,Jing Ren,Sen Qian
The development of low-cost and highly efficient thermal neutron detection materials to substitute the rare and expensive 3He gas is important for the area. Lithium-based glass (Li glass) is a promising candidate due to its simple fabrication process and low cost. This paper reports the optical properties and scintillation performance of a new Ce3+-doped Li glass, whose luminescence efficiency is significantly enhanced with a light yield of about 4770 ph/MeV, which is about 54% of that of BGO crystal, and the energy resolution is 14.5% for 662 keV gamma rays. The Ce3+-doped Li glass showed a high light yield of about 7058 ph/neutron, which is about 1.18 times that of the reference GS20 glass. The Ce3+ doped Li glass exhibits stronger gamma rays suppression capability compared to GS20 glass samples. Further optimizing the Ce3+ concentration and 6Li content is expected to achieve much superior neutron detection efficiency, positioning it as a promising alternative to 3He gas for efficient thermal neutron detection.
研究领域:
材料科学
·
核技术应用
✓ 已验证
DOI
高影响因子
Methods and Applications in Fluorescence
·
2019
·Vol. 8
·期 1
·015002
·
IF 2.94
Fanyong Yan,Yingxia Jiang,Keqing Fan,Tengchuang Ma,Liang Chen,Cong Ma
The effect of aminopyridines substituted at different positions on the fluorescence properties deserves to be studied. Since 2-aminopyridyl-based probes have been reported, the effects of 3-aminopyridine and 4-aminopyridine on the performance of fluorescein probes were discussed in here. Two Schiff base fluorescein probes FN-1, FN-2 were designed and synthesized. Among them, since the ligand shows a highly selective and sensitive response to metal charge transfer (LMCT), the fluorescence of FN-1 can be quenched by Ce3+ ions in PBS buffer. At the same time, a specific precipitation reaction between Ce3+ and F− releases the free probe to restore the fluorescence of FN-1. Therefore, FN-1 can be used for the recyclable 'ON-OFF-ON' detection of Ce3+and F−. The detection limits for Ce3+and F− are 4.48 μM and 11.58 μM in concentration range of 0–50 μM and 0–150 μM. However, due to the para position of N and amino groups on 4-aminopyridine, the spatial structure of FN-2 cannot be complexed with ions, resulting in poor selectivity. Polyvinylidene fluoride (PVDF) membrane containing FN-1 were prepared for the real-time qualitative detection of Ce3+and F− in real water samples. FN-1 exhibits high water solubility and biocompatibility and has been successfully applied to biological imaging in vascular smooth muscle cells (VSMCs).
研究领域:
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PHYSICS LETTERS
·
2017
·
IF 1.815
Baochen Wang,Yan-gai Liu,Zhaohui Huang,Minghao Fang
A series of Ca 3 Si 2 O 4 N 2 :Ce 3+ , Tb 3+ phosphors were synthesized and their phase composition and luminescence properties were investigated. Results showed that an efficient energy transfer occurred between the Ce 3+ and Tb 3+ ions. The thermal stability of the Ce 3+ emission was dramatically enhanced upon Tb 3+ doping. The mechanism was attributed to a shift of the configuration coordinate and an increased energy barrier for thermal quenching, which resulted from the enhanced rigid structure of the host. Finally, a white light emitting diode lamp was fabricated, which exhibited excellent properties. These results indicate that Ca 3 Si 2 O 4 N 2 :Ce 3+ , Tb 3+ can serve as promising blue-green emitting phosphors for w-LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 9
·3373
·
IF 3.4
Qi You,Hui Lin,Ruijin Hong,Zhaoxia Han,Dawei Zhang,Yuchong Ding
Cerium-doped gadolinium aluminum gallium garnet (Ce3+:Gd3Al3Ga2O12, Ce3+:GAGG) ceramic is a promising scintillation material. In this study, Ce3+:Gd3Al3Ga2O12scintillation ceramics were prepared by the one-step sintering of commercially available Gd2O3, Al2O3, Ga2O3, and CeO2powders in a flowing oxygen atmosphere at 1600 °C by solid-phase reaction sintering. For all the Ce3+:Gd3Al3Ga2O12ceramic samples doped with different amounts of Ce3+doping, dense ceramics were obtained. The structure, photoluminescence, and scintillation properties of the Ce3+:Gd3Al3Ga2O12ceramics have been investigated. The average grain size of samples sintered at 1600 °C is about 2 μm. The X-ray excitation luminescence peak is around 560 nm, which is consistent with that of Ce3+:Gd3Al3Ga2O12single crystals, matching well with the computed tomography X-ray detector’s response sensitivity. The light yield is higher compared to the standard reference sample—lutetium yttrium orthosilicate single crystal.Keywords:Ce3+:Gd3Al3Ga2O12;one-step sintering;X-ray detector;opto-functional ceramics
研究领域:
材料科学
·
光学工程
✓ 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）