FERROELECTRICS
·
2024
·
IF 0.6
Li Suwen,Gao Jinyu,Shen Hongzhi,Guan Cong,Yue Jinying
CaF2: Eu3+ nanoparticles with different doping concentrations were prepared by a hydrothermal method. The surface of the prepared nanoparticles was modified by 1,2,4,5-benzenetetracarboxylic acid. The structure, morphology, photoluminescence properties, and fluorescence dynamics are studied systemically. The functionalized nanoparticles have a broad excitation band in UV-vis area and high asymmetry radio. The luminescence of Eu3+ ions in CaF2 nanoparticles is improved by 1,2,4,5-benzenetetracarboxylic acid bonded onto the surface of nanoparticles via the energy transfer process. The excited state lifetimes of functionalized nanoparticles are longer than those of un-functionalized nanoparticles. These kinds of materials have the potential to be applied in luminescent solar concentrators.
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高影响因子
Advanced Optical Materials
·
2024
·
IF 8
Jiangkun Chen,Yang Guo,Bing Chen,Weilin Zheng,Xin Zhang,Xiaohe Wei,Yaxin Cao,Hao Suo,Feng Wang
Hydrochromic luminescent materials that are responsive to water or moisture have attracted considerable attention owing to their extensive use in sensing and information security. However, fine-tuning hydrochromic response to water content remains unfulfilled research, posing constraints in the widespread application of hydrochromic luminescence. This study reports a 0D Rb 3 TbF 6 perovskite with highly controllable hydrochromic characteristics. The Rb 3 TbF 6 crystals exhibit a distinct hydrochromic luminescence switching after B-site doping with Eu 3+ , stemming from Rb 3 TbF 6 to Rb 2 TbF 5 transformation that triggers intra-crystal Tb 3+ -to-Eu 3+ energy transfer. Through A-site alkaline metal alloying, the sensitivity of the perovskite to water stimuli is precisely tuned, rendering distinct responses over a wide range of humidity conditions (RH: 1–90% RH) and water levels (v/v: 0.5–55%). As an added benefit, the hydrochromic crystals also show excellent repeatability and photothermal stability. These advances on hydrochromic materials provide exciting opportunities in water detection, humidity sensing, and multi-level information encryption.
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高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Hanyou Hu,Tong Qi,Shang Wang,Dandan Wang,Jiajun Xu,Hao Wu,Huajun Wu,Zhendong Hao,Quansheng Liu,Liangliang Zhang
X-ray-excited persistent luminescence (XEPL) phosphors have garnered considerable attention in flexible X-ray delayed imaging. However, the poor chemical stability of the corresponding phosphors limits their practical applications. In this paper, a garnet phosphor, Lu3Ga5O12:Eu3+ (LGG:Eu3+), with excellent chemical stability and outstanding XEPL performance, is reported. After 50 cycles of X-ray radiation, there is no significant decrease in the luminescence intensity of LGG:Eu3+. In addition, the LGG:Eu3+ afterglow phosphor has shallow traps with a depth of 0.91 eV and an afterglow duration exceeding 50 min. A flexible film composed of LGG:Eu3+ and polydimethylsiloxane (PDMS) was prepared for X-ray delayed imaging. Our findings prove that LGG:Eu3+ is a chemically stable XEPL phosphor for flexible X-ray delayed imaging techniques.
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DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2014
·Vol. 14
·期 5
·3677-3682
·
IF 1.339
Li S. Wen,Ren H. Juan,Ju S. Guang
The LaF3 nanoparticles doped with different concentration Eu3+ ions are prepared by a simple and low temperature synthetic route. The nanoparticles with the size of about 3.5 nm are roughly spherical and monodisperse. The emission of Eu3+ ions is sensitized
through pyromellitic acid bonded onto the surface of nanoparticles. The structure, morphology, photoluminescence properties and fluorescence dynamics are studied systemically. The results show that the sensitized nanoparticles have a broad absorption band in the UV domain and high asymmetry
radio, and enhanced Eu3+ luminescence by “antenna effect” of ligands. The excited state lifetimes of sensitized nanoparticles are longer than those of un-sensitized nanoparticles and corresponding europium complexes.
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高影响因子
Journal of Applied Spectroscopy
·
2020
·Vol. 87
·期 4
·753-757
·
IF 0.71
Sun J.,Li Q.,Zhou Q.
Eu 3+ -doped NaLaMo 2 O 8 phosphors were synthesized by a conventional solid-state reaction. The phase and luminescent properties of the synthesized phosphors were investigated in the current work. In NaLaMo 2 O 8 , Eu 3+ ions replace La 3+ ions and form solid compound. This substitution induces the 2θ angles of diffraction peaks to shift to larger values. Under excitation at 395 nm, NaLaMo 2 O 8 :Eu 3+ phosphors exhibit emission bands in the range of 550–725 nm originating from 5 D 0 → 7 F J transitions (J = 0, 1, 2, 3, 4) of Eu 3+ . The strongest emission band corresponds to the 5 D 0 → 7 F 2 transition, which indicates a site of Eu 3+ without inversion symmetry in NaLaMo 2 O 8 . The Eu 3+ concentration has obvious influence on the luminescent properties of NaLaMo 2 O 8 :Eu 3+ phosphors. NaLaMo 2 O 8 :6 mol%Eu 3+ has the strongest excitation and emission intensities.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Li Chen,Junting Chen,Chunyu Wang,MeiLing Chen,Fangyin Zhu,Zhengye Xiong,Jingyuan Guo
A dual-functional luminescent materials NaYSrWO 6 :xEu 3+ (x = 0.005,0.01,0.05,0.1,0.15,0.2,0.3,0.5) with a double perovskite structure was synthesized using a high temperature solid state reaction method. Systematic investigations of their photoluminescence, thermoluminescence and radiation luminescence properties were carried out. Under blue light excitation, Maximum PL intensity was achieved with Eu 3+ doping concentration of x = 0.15. Excited at 325 nm, the material exhibited characteristic red emission of Eu 3+ with quantum efficiency reaching 64.4 %, CIE color coordinates of (0.607, 0.358), color purity of 87.21 %, correlated color temperature of 1970 K, and activation energy of 0.214 eV. These parameters satisfy the critical requirements for phosphors in indoor LED lighting systems.The thermoluminescence curve of the sample shows two apparent peaks at approximately 407K and 460K temperatures.The material demonstrated superior thermoluminescence performance at doping concentrations (x = 0.3). TL response increased linearly with increase in dose rate within 0.266–2.1 Gy/min, indicating potential for real-time low-dose-rate radiation monitoring. After X-ray irradiation, it features fast saturation, stable luminescence, short afterglow, and excellent repeatability. This study confirms that the double perovskite tungstate NaYSrWO 6 :xEu 3+ simultaneously achieves efficient photoluminescence and radiation-responsive characteristics, demonstrating promising applications in white LED lighting, real-time dosimetry, and X-ray imaging technologies.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 103
·期 5
·3273-3285
·
IF 3.502
Dayu Huang,Yi Wei,Peipei Dang,Xiao Xiao,Hongzhou Lian,Jun Lin
LaScO 3 : x Bi 3+ , y Tb 3+ , z Eu 3+ ( x = 0 − 0.04, y = 0 − 0.05, z = 0 − 0.05) phosphors were prepared via high-temperature solid-state reaction. Phase identification and crystal structures of the LaScO 3 : x Bi 3+ , y Tb 3+ , z Eu 3+ phosphors were investigated by X-ray diffraction (XRD). Crystal structure of phosphors was analyzed by Rietveld refinement and transmission electron microscopy (TEM). The luminescent performance of these trichromatic phosphors is investigated by diffuse reflection spectra and photoluminescence. The phenomenon of energy transfer from Bi 3+ and Tb 3+ to Eu 3+ in LaScO 3 : x Bi 3+ , y Tb 3+ , z Eu 3+ phosphors was investigated. By changing the ratio of x , y , and z , trichromatic can be obtained in the LaScO 3 host, including red, green, and blue emission with peak centered at 613, 544, and 428 nm, respectively. Therefore, two kinds of white light-emitting phosphors were obtained, LaScO 3 :0.02Bi 3+ ,0.05Tb 3+ , z Eu 3+ and LaScO 3 :0.02Bi 3+ ,0.03Eu 3+ , y Tb 3+ . The energy transfer was characterized by decay times of the LaScO 3 : x Bi 3+ , y Tb 3+ , z Eu 3+ phosphors. Moreover absolute internal QY and CIE chromatic coordinates are shown. The potential optical thermometry application of LaScO 3 :Bi 3+ ,Eu 3+ was based on the temperature sensitivity of the fluorescence intensity ratio (FIR). The maximum S a and S r are 0.118 K −1 (at 473.15 K) and 0.795% K −1 (at 448.15 K), respectively. Hence, the LaScO 3 :Bi 3+ ,Eu 3+ phosphor is a good material for optical temperature sensing.
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高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Fengjun Chun,Wen Deng,Binbin Zhang,Wen Li,Meilin Xie,Chao Luo,Weiqing Yang
Rare-earth-doped luminescent thin films have been responsible for unprecedented positive impacts in optoelectronic devices with high lateral resolution, excellent thermal stability, and strong adhesion to the solid surface. However, limited emission intensity and high-cost fabrication routine deeply inhibit their practical and commercial applications. Here, we propose a grain orientation engineering strategy via simple and low-cost polymer-assisted deposition (PAD) to fabricate textured BaMoO 4 : Eu 3+ thin films with highly improved emission intensity by reducing the lattice mismatch between the thin films and substrates. The high-quality <004>-textured BaMoO 4 : Eu 3+ thin film mounted on the (001)-oriented Si substrate with the Lotgering factor F 004 of 94.6%, boosting up the emission intensity of which to 366% compared to their randomly oriented counterparts. Moreover, the as-fabricated BaMoO 4 : Eu 3+ film shows strong red emission at 615 nm corresponding to the 5 D 0 → 7 F 2 transition of Eu 3+ with correlated color temperature (CCT) of 2922 °C and ultra-high color purity (nearly 100%). Furthermore, the geometry, size, and luminescence performance of the crystals can be precisely manipulated by tuning the growth temperature, layers of the film, and doping concentration. The present research offers a novel and low-cost route to engineer luminescent films with controllable orientation and enhanced emission intensity, which demonstrate great potentials towards practical applications and industrialization.
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高影响因子
BULLETIN OF MATERIALS SCIENCE
·
2023
·Vol. 46
·期 2
·1-10
·
IF 1.8
Liang Dong,Xiong Sang,Zhang Xiaomeng,Ye Yuanfeng,Cao Jingxin,Hu Xingxing,Song Yao,Wei Qianwen
WO 3 :Eu 3+ powder was prepared by microemulsion method with cetyltrimethyl ammonium bromide (CTAB) as a surfactant. The prepared WO 3 :Eu 3+ samples were wrapped with SiO 2 by a coating method. The WO 3 :Eu 3+ @ SiO 2 nanocomposites with the core-shell structure were prepared by controlling tetraethyl orthosilicate (TEOS) content (1, 3, 5 and 7%) and water–alcohol ratio (1:3, 1:1.5, 1:1 and 2:1). The structure, morphology and luminescence properties of the prepared WO 3 :Eu 3+ @ SiO 2 samples were characterized by XRD, SEM, TEM and fluorescence spectra. The results show that the prepared WO 3 :Eu 3+ @SiO 2 nanocomposites are spherical and granular, and the average particle size is below 100 nm. Under the condition of different TEOS contents, the strongest characteristic peak is located at 554 nm in the green light band at the excitation wavelength of 328 nm. Among the different water–alcohol ratio conditions, the prepared WO 3 :Eu 3+ @SiO 2 nanocomposite has the strongest luminescence intensity at the water–alcohol ratio of 1:3, and the excitation wavelength is 328 nm. The excitation spectra measured at 612 nm have prominent characteristic peaks at 362, 394, 422, 465 and 499 nm, which correspond to the transition of 7 F 0 → 5 D 4 , 7 F 0 → 5 L 6 , 7 F 0 → 5 D 3 , 7 F 0 → 5 D 2 and 7 F 0 → 5 D 1 , respectively.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 10
·5887-5897
·
IF 3.9
DanYu Zhang,YuXuan Luo,ShuJun Xu,LianJie Li,JunYu Chen,Lei Lei,Hai Guo
In this paper, Y 4 GeO 8 :Bi 3+ ,Eu 3+ phosphor with dual emission centers was elaborated via conventional solid-state reaction technology. Thorough research on the structure, morphology, and luminous properties of Y 4 GeO 8 :Bi 3+ ,Eu 3+ phosphor, the potential applications in optical thermometry were investigated by means of fluorescence intensity ratio and thermochromic techniques. Under 290 and 347 nm excitation, Y 4 GeO 8 :Bi 3+ ,Eu 3+ phosphor presents broadband emission from 3 P 1 → 1 S 0 transition of Bi 3+ ions and characteristic emission peaks from 4f–4f transition of Eu 3+ ions. Outstanding temperature-sensing capabilities are acquired from Y 4 GeO 8 :Bi 3+ ,Eu 3+ phosphor. The maximum relative sensitivity ( S r ) can attain 1.51% K −1 ( λ ex = 290 nm). With temperature raising (303–513 K), the emitted color of Y 4 GeO 8 :Bi 3+ ,Eu 3+ phosphor ( λ ex = 290 nm) shifts from faint yellow to red with a high chromaticity shift (0.180), which can be distinguished by the unaided eye clearly. Our results indicate that Y 4 GeO 8 :Bi 3+ ,Eu 3+ phosphor has potential applications in optical temperature measurement and high-temperature safety marker.
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高影响因子
JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Youfa Tai,Ruirui Cui,Jun Zhang,Chunkai Wang,Tingyu Zhao,Beiqiao Zhang,Chaoyong Deng
Novel orange-red Sr 2 GdSbO 6 : x Eu 3+ ( x = 0, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6) phosphors were successfully prepared by the traditional high-temperature solid-state method. The results of Rietveld refinement, energy dispersive spectroscopy (EDS) spectrum and elemental mapping demonstrate that Eu 3+ successfully replaces the Gd 3+ sites and distributes uniformly in the particles of phosphors. The luminescence properties of Sr 2 GdSbO 6 :Eu 3+ phosphors were investigated in detail. The emission spectra of the strongest emission peak is the 5 D 0 → 7 F 1 (593 nm) transition, which can emit orange-red light under 393 nm excitation. When the doping concentration of Eu 3+ ions is x = 0.2, the luminescence intensity of the phosphors reaches the highest. The detailed mechanism of concentration quenching is attributed to dipole-dipole interaction. The thermal stability values of Sr 2 GdSbO 6 :0.2Eu 3+ phosphors are 87%, 82% and 114% under 393, 467 and 527 nm excitations, respectively. The causes of the abnormal thermal quenching under 527 nm excitation were analyzed. Based on the abnormal thermal quenching under 527 nm excitation, the optical thermometry properties of Sr 2 GdSbO 6 :0.2Eu 3+ phosphors were investigated by fluorescence intensity ratio (FIR) technique, and appreciable relative sensitivity was obtained. The results suggest that Sr 2 GdSbO 6 :0.2Eu 3+ phosphors can be potentially applied to w-LEDs and optical thermometers.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 43
·20210-20223
·
IF 4.682
Wang Ruo-tian,Xiong Sang
Nano-WO 3 :EU 3+ powder was prepared by Pechini method under acidic and alkaline condition, and the prepared acidic nano-WO 3 :Eu 3+ mixed with the silver nanowires (AgNWs) in ethanol and acetone solution. The solution was mixed with PMMA and EP, respectively. Then, drops of the solutions were added to the indium tin oxide (ITO) conductive glass as the substrate; a AgNWs/WO 3 :Eu 3+ composite film was obtained with spin coating by spin coater and solidification process. Microstructure, morphology, optical properties, preparation process and UV transmittance of the prepared nano-WO 3 :Eu 3+ and AgNWs/WO 3 :Eu 3+ composite films were investigated by XRD, SEM, fluorescence spectroscopy and UV spectrophotometer. The results show that the prepared acidic nano-WO 3 is triclinic, and the average particle size is 71.63 nm. The prepared alkaline nano-WO 3 is monoclinic, with an average particle size of 95.66 nm. Both of them have good luminescence properties. Under different monitoring wavelengths, in the emission range of 450–500 nm, it belongs to the green light region, and its excitation peak is the largest, indicating that green light is the best excitation light source for WO 3 :Eu 3+ powder. The transmittance of EP/AgNWs/WO 3 :Eu 3+ composite film is the highest when the spin coating time is more than 30 s and above 3000 rpm, no more than three layers spin coating and the content of curing agent is between 0.1 and 0.2 g.
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高影响因子
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