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.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Mingze Zhang,Lin Lin,Zhuohong Feng,Zhezhe Wang,Yuanming Yang,Wenjun Ma,Jieyi Cai,Pan Lu,Siyi Jia,Zhiqiang Zheng
In this work, catena-[(μ-benzene-1,3,5-tricarboxylato)-(1,10-phenanthroline)-( N , N -dimethylformamide)-gadolinium(iii)- N,N -dimethylformamide solvate] (denoted as Gd-MOF) co-doped with Eu 3+ and Dy 3+ was successfully synthesized. The entire X-ray diffraction peaks of the sample match well with the Gd-MOF phase. A detailed characterization by inductively coupled plasma mass spectrometry (ICP-MS) shows that the actual concentration is basically consistent with the design concentration. The temperature sensing properties of Gd-MOF:Eu 3+ ,Dy 3+ were analyzed by temperature-dependent fluorescence spectra from 213 to 453 K. As temperature rises, the emission color of Gd-MOF:Eu 3+ ,Dy 3+ changes from yellow to red. The relative sensitivity reaches a maximum of 5.87%/K at 383 K in the Gd-MOF:1%Eu 3+ ,30%Dy 3+ sample. The high relative sensitivity of this MOF is due to the phonon-assisted energy transfer from Dy 3+ to Eu 3+ , which is proved via fluorescence decay curves and fluorescence spectra. The major route of this energy transfer is 4 F 9/2 (Dy 3+ ) → 5 D 1 (Eu 3+ ).
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Quanwang Niu,Junwen Yu,Xiyuan Chen,Xiaohong Yan,Xiangfu Wang
Optical approaches for logic operations and sensing, compared with traditional electrical systems, possess advantages of rich tunability and multi-environmental stimulus response. In this study, Eu 3 + /Dy 3+ -doped Y 2 Mo 3 O 12 phosphors are investigated, focusing on their photoluminescence intensity enhancement as the temperature increases. Based on these properties, multiple functional systems were designed and implemented. These include light and thermal input logic circuit system achieved by modulating emission intensities, and a spatially encoded matrix capable of performing six different logic operations. Furthermore, an optical thermometer utilizing fluorescence intensity ratio variations and a dual-modal sensor integrating optical temperature detection with electrical pressure sensing, exhibiting minimal signal crosstalk, were developed. These results suggest that Y 2 Mo 3 O 12 : Eu 3+ , Dy 3+ phosphors hold great potential for advanced optoelectronic logic and sensing applications.
研究领域:
光电材料
·
智能传感器
·
功能荧光材料
·
温度与压力传感
·
光学逻辑电路
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Sayed Ali Khan,Abdul Jalil,Qudrat Ullah Khan,Rana Muhammad Irfan,Ikhtisham Mehmood,Karim Khan,Maryam Kiani,Binbin Dong,Noor Zamin Khan,Jun-Ling Yu,Ling Zhu,Simeon Agathopoulos
A novel single-phase white-light-emitting YPO 4 phosphor, single and co-doped with Dy 3+ /Eu 3+ , aiming at UV-pumping in white-light-emitting diodes (WLEDs) which exhibits an outstanding optical performance, was successfully produced. The crystal structure, the morphology, the electronic band structure , the electronic configuration, and the bond length of the prepared phosphors were thoroughly investigated, both experimentally and by computational methodology. The results showed that the host lattice provides various surrounding environments to the Eu 3+ activators is a results of Eu 3+ single and Dy 3+ /Eu 3+ co – doped YPO 4 phosphors. Under ultra-violet (UV) excitation (353 nm), the prepared tetragonal phase YPO 4 :Dy 3+ phosphors emitted a bluish-white-light because it has peaks of similar intensity in the blue and the yellow spectral region . The emission spectrum can be tuned from bluish white to green/yellow/red and warm white by adjusting the concentration of Tb 3+ /Eu 3+ dopants . A high photoluminescence quantum yield (PLQYs) 68.55% was achieved. It was observed that the tetragonal YPO 4 :Tb 3+ /Dy 3+ /Eu 3+ phosphors emit-white-light which covers the whole visible region, and have good thermal stability from 20 to 200 °C. Finally, a WLED was fabricated by using a UV LED (365 nm) chip coated with the optimized YPO 4 :Tb 3+ /Dy 3+ /Eu 3+ single-phase phosphor, demonstrating an excellent white-light emission with a high CRI value (R a = 92) and a low CCT value (T c = 2497 K). Hence, the produced material is a promising candidate for UV-pumped single-phase phosphor-converted WLEDs.
研究领域:
材料科学
·
光学工程
·
无机化学
·
固体物理
·
光电子学
·
功能材料
·
照明技术
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 9
·6414-6423
·
IF 2.993
Hu Zeqing,Guo Yan,Zhang Jinghui,Zhang Yanjie
The novel Ca 4− x (PO 4 ) 2 O: xDy 3+ and Ca 4− x − y (PO 4 ) 2 O: xDy 3+ , yEu 2+ multi-color phosphors were synthesized by traditional solid-state reaction. The crystal structure, particle morphology, photoluminescence properties and energy transfer process were investigated in detail. The X-ray diffraction (XRD) results demonstrate that the products showed pure monoclinic phase of Ca 4 (PO 4 ) 2 O when x < 0.1. The scanning electron microscopy (SEM) indicated that the phosphors were grain-like morphologies with diameters of ~ 3.7–7.0 μm. Under excitation of 345 nm, Dy 3+ -doped Ca 4 (PO 4 ) 2 O phosphors showed multi-color emission bands at 410, 481 and 580 nm originated from oxygen vacancies and Dy 3+ . Interestingly, Ca 4 (PO 4 ) 2 O: Dy 3+ , Eu 2+ phosphors exhibited blue emission band at 481 nm and broad emission band from 530 to 670 nm covering green to red regions. The energy transfer process from Dy 3+ to Eu 2+ was observed for the co-doped samples, and the energy transfer efficiency reached to 60% when Eu 2+ molar concentration was 8%. In particular, warm/cool/day white light with adjustable CCT (2800–6700 K) and high CRI ( R a > 85) can be obtained by changing the Eu 2+ co-doping contents in Ca 4 (PO 4 ) 2 O: Dy 3+ , Eu 2+ phosphors. The optimized Ca 3.952 (PO 4 ) 2 O: 0.04Dy 3+ , 0.008Eu 2+ phosphor can achieve the typical white light with CCT of 4735 K and CRI of 87.
研究领域:
材料科学
·
光学材料
·
发光学
·
荧光粉化学
·
固态照明
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Li Wang,Zhichao Jin,Zhongli Zhu
The SiO 2 –B 2 O 3 –Bi 2 O 3 –CaO (SBBC) luminous glass samples, co-doped with Tm 3+ , Dy 3+ , and Eu 3+ ions, were prepared. Upon 362 nm stimulation, the co-activated SBBC glasses exhibited distinct spectral transitions corresponding to Tm 3+ : 1 D 2 → 3 F 4 , Dy 3+ : 4 F 9/2 → 6 H 15/2 , 13/2 , as well as Eu 3+ : 5 D 0 → 7 F 2 in the 400–700 nm. Moreover, the study identified two significant energy transfer mechanisms, Dy 3+ →Tm 3+ and Dy 3+ →Eu 3+ , which contribute to the enhanced photoluminescence of the glasses. The optimal CIE coordinates were determined to be (0.3312, 0.3436), with CCT of 5552 K, as well as color purity of 2.55 %. Importantly, an investigation into the thermal stability of selected glass revealed an impressive ΔT of 140 °C. This study shows the potential value of glass in the field of W-LED.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ou Hai,Peng Li,Xin An,Weikang Dong,Tong Li,Zechuan Qi,Yuanting Wu
In order to broaden the application field of long afterglow materials, it is a challenge to realize high stability and multicolor properties of long afterglow materials. The photoconversion method is a condition that enables simultaneous afterglow color shifts, however, the stable and efficient photoconversion agent is an urgent problem. This study propose a strategy to synthesize CsPbBr 3 quantum dots (QDs) directly within porous SiO 2 on the surface of Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ (SMS). The resulting composites achieve a shift in emission and afterglow color from blue (about 468 nm) to green (about 520 nm), and in the UV irradiation for 8 days, the luminous intensity is almost unaffected, in the air exposure for 3 months, the luminous intensity can still be maintained at more than 80 % of the initial value. Since the synthesized composite material is a powder, it can be mixed with various media. Composite materials can be homogeneously mixed with coatings, resulting in coatings with a variety of luminescent colors and producing effective multicolor luminescence, which has significant potential in the field of luminescent coatings and anti-counterfeiting.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-9
·
IF 4.011
Liu Ning,Mei Lefu,Liao Libing,Fu Jie,Yang Dan
What ideal w-LED phosphors always aim to do is to achieve a single phase near-sunlight emission phosphor simultaneously with both high luminescence efficiency and high thermal stability at operation temperature. And It is well known that apatite compound phosphors are one of the most promising optical materials to realize those above because of their unique structure enhanced luminescence properties and thermal stability. Here, we synthesized a co-doped single phase apatite phosphors Ca 2 La 8 (SiO 4 ) 6 O 2 :Dy 3+ /Sm 3+ (CLSO:Dy 3+ /Sm 3+ ) for white light emission, which was provided with excellent thermal stability and of which luminescence intensity at 150 °C still was 92 percentage of that at room temperature. Moreover, X-ray diffraction technique, Fourier transform infrared spectroscopy, scanning electron microscope were employed to characterization of phase structure and morphology, and consequently pure apatite structure and gravel-like morphology of phosphors were proved. Analysis of photoluminescence spectra indicated that concentration quenching effect exist in single-doped CLSO:Dy 3+ phosphors owing to dipole-dipole interaction between Dy 3+ ions. It is revealed that maybe exist Dy 3+ ↔ Sm 3+ bilateral non-radiative energy transfer processes in Dy 3+ /Sm 3+ co-doped CLSO system by PL spectra and decay curves. And variation of Sm 3+ ion concentration can control color emission, namely CIE chromaticity coordinates and correlated color temperature, finally to achieve white light emission (0.309,0.309) with CCT 6848 K, able to be a potential candidate for commercial lighting applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 32
·19173-19186
·
IF 10.733
Xiaoming Liu,Xueya Chen,Yizu Li,Bingquan Wu,Xubiao Luo,Sheng Ouyang,Shenglian Luo,Abdulaziz A. Al Kheraif,Jun Lin
Here, we demonstrate a g-C3N4@Au@SrAl2O4:Eu2+,Dy3+ composite as a novel efficient self-luminous visible-light plasmonic photocatalyst for photocatalytic degradation of organic pollutants and hydrogen evolution from water around the clock. The g-C3N4@Au@SrAl2O4:Eu2+,Dy3+ composite was prepared by integrating a g-C3N4@Au plasmonic photocatalyst composite with a SrAl2O4:Eu2+,Dy3+ long-afterglow phosphor through a simple Pechini-type sol–gel method followed by a mechanical mixing and high-temperature calcination process. Owing to the synergistic effect of surface plasmon resonance of the Au nanoparticles in g-C3N4 and long-lasting phosphorescence of the SrAl2O4:Eu2+,Dy3+ phosphor, the prepared g-C3N4@Au@SrAl2O4:Eu2+,Dy3+ composite shows a continuous and efficient photocatalytic activity for photocatalytic degradation of organic pollutants and hydrogen evolution from water in a sunless environment. The current research study could provide a new strategy for designing a highly efficient composite photocatalyst for solar environmental purification and hydrogen energy production around the clock.
研究领域:
光催化
·
环境科学
·
材料科学
·
可再生能源
·
纳米技术
✓ 已验证
DOI
高影响因子
Optical Materials Express
·
2018
·Vol. 8
·期 8
·2089-2102
·
IF 2.566
Jian Cui,Xusheng Xiao,Yantao Xu,Xiaoxia Cui,Meiling Chen,Junjiang Guo,Min Lu,Bo Peng,Haitao Guo
For developing an ideal efficient and low-threshold medium for fiber lasers operated at 4 μm wavebands, 0.05 wt.% to 0.5 wt.% Dy3+ ions doped Ga0.8As39.2S60 chalcogenide glasses were investigated and a 4.2 μm fiber laser was theoretically studied based on the rate and propagation equations. It was shown that the Ga0.8As39.2S60 glass shows a desirable large Dy3+ ion solubility, which has been increased by an order of magnitude compared to As2S3 glass. Dy-rich nanocrystallines were found when the Dy3+ ions’ concentration is more than 0.3wt.% (i.e. 3000 ppmw), and the concentration quenching was found based on spectral analysis; however, no rapid decreases in lifetimes were observed. 0.3wt.% Dy3+ doped Ga0.8As39.2S60 glass possesses relatively large laser quality factor σemi × τmea = 1.70 × 10−23 cm2·s and excellent thermal stability (ΔT = 182°C), which can be successfully drawn into fibers indicating good potential for mid-infrared fiber laser.
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Shiyu Xu,Junjie Fu,Xuening Liu,Meiyu Yuan,Chaoqun Zhang,Haibo Wang,Guangxi Liu,Sheng Cui
A family of highly thermal chromatic stable Dy 3+ -Eu 3+ doped B 2 O 3 -Bi 2 O 3 -ZnO-Li 2 O (BBZL) glass samples was synthesised using the high-temperature melt quenching technique. The optical and thermal stability properties of the samples were analysed using their fluorescence spectra at various temperatures, fluorescence lifetime decay times and colour coordinates. The Dy 3+ -doped BBZL (BBZL: Dy) glass samples generated cold white light when exposed to ultraviolet (UV) light, while the Dy 3+ -Eu 3+ -doped BBZL (BBZL: DyEu) glass samples emitted neutral and warm white light, which can be attributed to the introduction of Eu 3+ that substantially enhanced the colour rendering of samples. An overlap of the excitation-emission spectra of Eu 3+ and Dy 3+ indicated an energy transfer between Dy 3+ and Eu 3+ . Under a 350 nm excitation, the fluorescence lifetime of BBZL: DyEu decreased from 0.5348 to 0.3642 ms. Using the Dexter theory, the energy transfer between Dy 3+ and Eu 3+ was demonstrated to be an electric dipole-electric dipole leap. The chromaticity shifts of BBZL: DyEu were 8.60 × 10 −4 and 9.40 × 10 −4 at 448 and 498 K, respectively, reflecting the high thermal stability of the sample chromaticity. The study demonstrated that Dy 3+ -Eu 3+ doped borate glasses can be used as tunable luminescent materials in high-power white light-emitting diodes to mitigate the chromaticity shift in fluorescent materials at high temperatures.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Xiao-hu Ma,Si-yuan He,Zhe-rui Zhang,Zhe Meng
Persistent light-emitting materials (PLMs), which have the potential to store and release light energy after light irradiation, are receiving increasing attention for their role in prolonging the lifetime of photogenerated electrons for the development of photocatalysts with round-the-clock applications. In this paper, a double S-scheme Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ /ZnIn 2 S 4 /UiO-66-NH 2 (SZU) heterojunction with round-the-clock catalytic activity was prepared by hydrothermal self-assembly method. The photocatalytic performance of the SZU heterojunction for RhB(MB) degradation was significantly improved compared with the pristine ZnIn 2 S 4 and UiO-66-NH 2 . The SZU heterojunction has excellent catalytic degradation performance for RhB (MB), and the removal rate of RhB (MB) reaches 72.2 % (81.7 %) after visible light irradiation for 40 (60) minutes. After the end of light, the total removal rate of RhB (MB) reached 86.7 % (96.8 %) when the catalysis continued for several hours under dark conditions, which was 14 % and 15 % higher than that under visible light irradiation, respectively. Based on the characteristics of SMS photoluminescence, combined with a large number of photocatalytic experiments, The sustained photocatalytic activity was enhanced under both daytime and darkness conditions, not only because of the production of SZU complexes, which prolonged the visible light response of ZnIn 2 S 4 , but also because of the construction of double S-scheme heterojunctions, which facilitates the light storage capacity, charge transfer, and the separation of photo-induced charge carriers and effectively promoted the photocatalytic activity of the photocatalysts. This work contributes to a deeper understanding of the design of round-the-clock photocatalysts, and provides a useful exploration for the practical application of photocatalytic technology.
研究领域:
材料科学
·
环境科学
·
光催化技术
✓ 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）