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.
研究领域:
材料科学
·
光电
·
固体物理
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ECS Journal of Solid State Science and Technology
·
2020
·Vol. 9
·期 12
·126006
·
IF 2.142
Yu-Guo Yang,Zhi-Jian Li,Xiang-Gang Zuo,Rui Zhang,Xu-Ping Wang,Qing-Gang Li,Bing Liu,Xian-Shun Lv,Lei Wei,Yuan-Yuan Zhang
We synthesized Dy3+ doped SrLaGa3O7 phosphors via a sintering process at 1350 °C under atmosphere. The X-ray diffraction data demonstrate that they have the pure tetragonal phase, meaning the successful substitution of Dy3+ in SrLaGa3O7 host. Monitoring at 572 nm, Dy3+ doped SrLaGa3O7 phosphors show a series of excitation bands within 275–475 nm. Exciting at 342 nm, Dy3+ doped SrLaGa3O7 phosphors show emission bands in the range of 450–700 nm. The emission bands respectively locate in blue, yellow and right light regions, which respectively correspond to 4F9/2 → 6H15/2, 4F9/2 → 6H13/2 and 4F9/2 → 6H11/2 transitions of Dy3+. The concentration quenching is induced by dipole-dipole interactions among neighboring Dy3+ ions. There is only one peak in the thermoluminescence glow curves of Dy3+ doped SrLaGa3O7 phosphors, indicating that there is only one type of trap center in these phosphors. The trap depth is calculated to be 0.754 eV.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Lin Fan,Ce Li,Tao Peng,Miao Yan,Xiaoqing Pei,Yifan Liu,Weiling Yang,Shasha Li,Hai Lin,Chun Li,Lina Liu,Xuechao Yu,Fanming Zeng
Phosphor-converted white light-emitting diodes (w-LEDs) have become indispensable for modern lighting and display technologies. However, the development of efficient and thermally robust white phosphors remains a persistent challenge. Here, we report a series of Sr 3 Y 2 Ge 3 O 12 : Dy 3+ garnet-based phosphors that exhibit dual emissions at 480 and 580 nm, enabling cool-white light generation. Co-doping with La 3+ effectively lowers the crystal symmetry and narrows the band gap from 4.67 to 4.56 eV, which enhances the radiative transitions of Dy 3+ . As a result, the emission intensities at 480 and 580 nm bands are boosted by factors of 2.21 and 1.91, respectively. The spectral modification drives a chromaticity shift from cool to warm white light, with correlated color temperature decreasing from 4703 K to 2927 K. Moreover, the modified phosphors exhibit excellent thermal stability (92.51 % at 150 °C) while maintaining high internal quantum efficiency (29.43 %). When integrated with 365 nm excitation chips, the phosphors enable the fabrication of w-LEDs with tunable color temperatures. These findings offer a promising pathway for the design of next-generation high-performance warm w-LEDs.
研究领域:
材料科学
·
发光材料
·
半导体照明
·
固态物理
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 9
·697
·
IF 3.504
Jun Yang,Taiping Xie,Chenglun Liu,Longjun Xu
Dy-doped BiOCl powder photocatalyst was synthesized A one–step coprecipitation method. The incorporation of Dy3+replaced partial Bi3+in BiOCl crystal lattice system. For Rhodamine B (RhB) under visible light irradiation, 2% Dy doped BiOCl possessed highly efficient photocatalytic activity and photodegradation efficiency. The photodegradation ratio of RhB could reach 97.3% after only 30 min of photocatalytic reaction; this was more than relative investigations have reported in the last two years. The main reason was that the 4f electron shell of Dy in the BiOCl crystal lattice system can generate a special electronic shell structure that facilitated the transfer of electron from valance band to conduction band and separation of the photoinduced charge carrier. Apart from material preparation, this research is expected to provide important references for RhB photodegradation in practical applications.Keywords:Dy3+;BiOCl;photocatalyst;RhB photodegradation;doping modification
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
POLYMERS & POLYMER COMPOSITES
·
2019
·
IF 0.683
Qing Zhang,Guixian Su
Polysiloxane with amino group as the functional side chain was prepared via equilibrium polycondensation reaction. It was modified with salicylaldehyde and then incorporated with lanthanide ions (Dy3+ and Sm3+) to obtain two luminescent functionalized polysiloxane–lanthanide composite materials. The structures and properties of products were characterized by Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, ultraviolet–visible absorption spectroscopy, fluorescent emission spectroscopy, and thermogravimetric analysis. The results show that two kinds of lanthanide ions were all incorporated successfully with the functionalized polysiloxanes. The coordination effect exists between the nitrogen atoms on the ligand and the lanthanide ions. In addition, the green and red light emissions that are characteristic of Dy3+ and Sm3+ were achieved.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2015
·
IF 4.762
Pengjiu Wang,Xuhui Xu,Dacheng Zhou,Xue Yu,Jianbei Qiu
Visible-light persistent phosphors are commonly used as self-sustained night vision and fluorescence labeling materials. From the inspiration of the structure of six-membered rings plane in Ba4(Si3O8)2, a similar structure of Ba5Si8O21 is expected that could exhibit more excellent phosphorescence property. In this Article, we report a novel visible long-lasting luminescence phosphor of Eu2+/Dy3+ codoped Ba5Si8O21 for the first time. Ba5Si8O21:Eu2+,Dy3+ phosphor could be activated effectively by sunlight or even in severe weather conditions, which is mainly attributed to the broad excitation spectrum (200–455 nm) and highly responds to UV-A and violet-light in the solar spectrum. After activation, Ba5Si8O21:Eu2+,Dy3+ emits intense emission at 380–680 nm with persistent phosphorescence beyond 16 h. Moreover, it exhibits excellent and stable phosphorescence even in water, indicating that Ba5Si8O21:Eu2+,Dy3+ will be a all-weather material that can be effectively and repeatedly charged by natural daylight in all kinds of open-air environments. Furthermore, the quantum tunneling behavior was illustrated in the afterglow mechanism.
研究领域:
材料科学
·
发光材料
·
光学性质
·
荧光粉
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Yang Jin,Lefu Mei,Ke Su,Qingfeng Guo,Libing Liao
Whitlockite-type structure phosphors have received extensive attention and research due to their adjustable chemical compositions in isomorphic compounds and providing rich crystal positions for doping activators. Ca 2.6 K 0.2 La 0.2 (PO 4 ) 2 whitlockite-type phosphors with Dy 3+ singly doping and Dy 3+ , Eu 3+ co-doping were prepared via high temperature solid-phase reaction, and the crystallographic characteristics, luminescence properties and temperature sensing performance were investigated in detail. The prepared phosphors are pure phase and both Dy 3+ and Eu 3+ enter into the matrix and produce blue, yellow and red emissions. The CCT values of the emitted light from Ca 2·6 K 0·2 La 0·2 (PO 4 ) 2 : Dy 3+ , Eu 3+ phosphors increase with the Eu 3+ concentration rises, changing from cold white light to warm white light. The integrated emission intensity of Dy 3+ in the phosphor decreases with the change in the doping ratio of Dy 3+ and Eu 3+ , causing by the energy transfer from Dy 3+ to Eu 3+ . The Ca 2·6 K 0·2 La 0·13 (PO 4 ) 2 :0.06Dy 3+ , 0.01Eu 3+ phosphor shows temperature sensing performance based on FIR technique, with the maximum relative sensitivity calculated to be 0.181% K −1 . All the results reveal that the Ca 2·6 K 0·2 La 0·2 (PO 4 ) 2 : Dy 3+ , Eu 3+ phosphors can be applied to w-LEDs and display devices, and can be used as a new type of optical thermometer.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2023
·Vol. 11
·期 16
·2300187
·
IF 9
Nan Zhang,Rui Zhang,Xieming Xu,Fang Wang,Zhicheng Sun,Shuaihua Wang,Shaofan Wu
X-ray flat-panel detectors are widely used for nondestructive detection of internal information in medical radiography and industrial applications. However, a persisting challenge is the application of radiography on highly curved 3D objects to realize flexibility and information storage for the fabrication of flexible large-area X-ray detectors. This study demonstrates a halide-based double perovskite Cs 2 Na 0.9 Ag 0.1 LuCl 6 :Dy 3+ by a hydrothermal reaction. The as-prepared crystals exhibit afterglow features through a co-doping strategy of Dy 3+ and Ag + ions. The double perovskite material with doping modification exhibits excellent scintillation properties with high sensitivity, low detection limit, and high radiation stability. In addition, flexible scintillator detectors are fabricated with an area of 8.0 × 6.0 cm 2 by the blade-coating strategy, which has a high spatial resolution of 11.2 lp mm −1 @MTF = 0.2. Based on the long afterglow properties, the Cs 2 Na 0.9 Ag 0.1 LuCl 6 :Dy 3+ flexible film exhibits thermoluminescence after turning off the X-ray, thereby having strong potential for X-ray imaging of nonflat and irregular objects.
研究领域:
材料科学
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医学成像
·
放射学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 9
·12616-12630
·
IF 2.478
Wang Shengjia,Xu Chenchen,Qiao Xuebin
Dy 3+ , Sm 3+ co-doped Y 2 SiWO 8 (YSiWO) phosphors were synthesized through the sol–gel method. The crystal structure, morphology, photoluminescence spectra and thermal stability of the phosphors have been thoroughly studied. The Dy 3+ dopant concentration is fixed at 2 mol% in co-doped samples. It is noticeable that energy transfer from Dy 3+ to Sm 3+ is apparent under the 365 nm excitation. The energy transfer mechanisms of Dy 3+ → Dy 3+ (YSiWO: Dy 3+ ), Sm 3+ → Sm 3+ (YSiWO: Sm 3+ ) and Dy 3+ → Sm 3+ (YSiWO: Dy 3+ , Sm 3+ ) are extensively studied, respectively. Upon the 365 nm excitation, the co-doped phosphor shows the color-tunable emission varying from blue-green to white via adjusting Sm 3+ concentration. The YSiWO: 0.02Dy 3+ , 0.06Sm 3+ phosphor exhibits an ideal warm white emission with CIE coordinates of (0.362, 0.323) and CCT of 4129 K. This phosphor is also found to possess the remarkable thermal stability. In summary, the YSiWO: Dy 3+ , Sm 3+ white-emitting phosphor may have potential use in w-LEDs.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Wenfeng Yuan,Xianke Sun,Meng Wu
A phosphor that emits both white light and broad near-infrared (NIR) light is of significant interest across various fields, as it enables both visual inspection and NIR spectroscopic detection. In this study, we designed Dy 3+ /Cr 4+ codoped CaLuGaO 4 phosphors that emit both white light and broad NIR light ranging from 1100 nm to 1700 nm when excited at 450 nm. The white light is produced by the 4 F 9/2 → 6 H 15/2 , 6 H 13/2 , 6 H 11/2 transitions of Dy 3+ . The broad NIR light arises from the 3 T 2 to 3 A 2 transition of Cr 4+ . Additionally, energy transfer from Dy 3+ to Cr 4+ occurs in the Dy 3+ /Cr 4+ codoped CaLuGaO 4 phosphors, allowing for tunable ratios of white light to NIR light by varying the concentrations of Dy 3+ and Cr 4+ . A phosphor-converted light-emitting-diode was constructed by encapsulating the synthesized phosphors around a commercial blue LED chip, demonstrating potential applications in lighting sources and non-destructive spectral analysis.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 5.6
Dexin Huang,Panbo Zhang,Han Xia,Wenjun Zhou,Yue Che,Yongtao Li,Xuejian Zhang,Jiao Li,Haina Qi,Huisheng Liu,Shengnan Xu,M. Priya,C.K. Mahadevan
Double-perovskite Ca 2 YSbO 6 phosphors doped with Dy 3+ /Sm 3+ were prepared by high-temperature solid-state reaction method. The phase structure of the samples was characterized by X-ray diffraction (XRD), and the microscopic morphology, microstructure, luminescence characteristics and energy transfer process of the Ca 2 YSbO 6 phosphor samples were systematically studied by means of scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), fluorescence spectroscopy and lifetime testing. Dy 3+ /Sm 3+ have been incorporated into the Ca 2 YSbO 6 (CYSO) crystal lattice, exhibiting a homogeneous distribution of elements throughout the structure. Ca 2 YSbO 6 : Sm 3+ , Dy 3+ phosphors exhibit intense red and yellow emission peaks at 601 nm and 565 nm, respectively. The luminescent performance of Ca 2 YSbO 6 : Sm 3+ , Dy 3+ phosphors is the highest when the doping concentrations of Sm 3+ and Dy 3+ are 0.03 mol and 0.04 mol. By adjusting the Dy 3+ concentration and utilizing its energy transfer to Sm 3+ , tunable emission from orange-red to yellow was achieved for the CYSO: 0.03 mol Sm 3+ , y mol Dy 3+ phosphor. Under 407 nm excitation, the Internal Quantum Efficiency (IQE) of the phosphor is 27.75%. Additionally, Variable-temperature emission spectroscopy further confirmed that the co-doped phosphor has obvious anti-thermal quenching properties. It still has 54.46% of the original luminous intensity at 423 K. The white light-emitting diodes (W-LEDs) demon-strated a high color rendering index (Ra) of 88 and a suitable correlated color temperature (CCT) of 5994 K. These results show that the proposed phosphor has great application potential in supplementing the red-light components of LED lighting.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Jinglei Cui,Yingjian Zhang,Xiaoguang Gui,Jingjing Tan,Yanxia Guo,Fangqin Cheng
Rare earth element (REE) is a strategic metal resource, heavy REE owns higher economic and strategic value compared with light rare earth elements. However, it is a great challenge for the separation of heavy rare earth ion efficiently in the solution with mixed rare earth ions due to the similar physicochemical properties of heavy and light REE. In this paper, the diglycolamide (DGA) modified silica adsorbents were prepared and applied to the selective adsorption of heavy earth ion Dy 3+ . The structure of DGA on the silica surface was regulated during the modifying processes to obtain DGA b -SiO 2 and DGA s -SiO 2 adsorbent, which was verified by FTIR and NMR characterization results. The adsorption results showed that the DGA b -SiO 2 adsorbent owned a much higher distribution coefficient ( K d ) value for the selective adsorption of Dy 3+ than the DGA s -SiO 2 adsorbent. The higher adsorption selectivity is likely due to the fixed carbon chain of the DGA group on the surface of DGA b -SiO 2 adsorbent formed rigid spatial structures of the oxygen atoms, which will be favorable for the selective coordination of Dy 3+ . Besides its effectiveness in adsorption behavior, the DGA b -SiO 2 adsorbent displayed excellent stability. The K d value of DGA b -SiO 2 for Dy 3+ selective adsorption maintained a high level after four successive recycling runs. The adsorption kinetics results displayed that the adsorption of Dy 3+ followed pseudo-second-order kinetic, and the adsorption process fitted the Langmuir isotherm model. Additionally, the same adsorption rules for the rare earth ions were observed over DGA-KIT-6 adsorbent, indicating the high universality of the surface modification to the adsorbent support, which will provide an intentional reference for the surface modification to other adsorbent support.
研究领域:
材料科学
·
化学工程
✓ 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）