CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Ligan Ma,Fumin Lu,Qingqing Yu,Peican Dai,Fangfang Hu,Hai Guo,Rongfei Wei
Nowadays, multi-mode luminescent thermometry has emerged as a strongly promising noncontact temperature-sensing technique, in which can realize the temperature determination more reliable and accurate by incorporating the excellent temperature monitoring properties from different modes of sensing. Herein, three-mode optical thermometry technics were triumphantly designed in thermochromic Gd 2 GaSbO 7 (GGS):Bi 3+ ,Eu 3+ phosphors. With ascending temperature, the emission color of GGS:Bi 3+ ,Eu 3+ varies remarkably from pink to yellow with the thermo-caused chromaticity shift reaching 0.2505, being easily differentiated by our eyes. Employing the fluorescence intensity ratio of well-separated emission bands of Bi 3+ and Eu 3+ , outstanding relative sensitivity ( S R ) of 1.03% K - 1 , favorable temperature uncertainty of 0.296 K, excellent reversibility and repeatability are acquired. Moreover, profiting by the rapid decline of fluorescence decay lifetime of Bi 3+ ( 3 P 1 ) in GGS:Bi 3+ ,Eu 3+ with temperature elevating, the optimal S R reaches 0.75% K - 1 at 473 K, higher than most reported optical thermometers. These discoveries indicate that GGS:Bi 3+ ,Eu 3+ phosphors have fantastic prospects in multi-mode temperature detection and high temperature warning areas.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Guangmin Xie,Yuan Wang,Xinzhe Zhou,Liang He,Huanrong Li
Developing a contactless ratiometric luminescent thermometry with high sensitivity, widely available temperature range, and reliable performance is still a challenge in materials science. Herein, we adopted an in-situ formation strategy to synthesize luminescent lanthanide complexes in siloxane-polyether matrix by the reaction between 4′-(4-carboxyphenyl)- 2,2′:6′,2″- terpyridine (Hcptpy) ligand and lanthanide ions (Eu 3+ /Tb 3+ ) to realize a ratiometric luminescent thermometer. The unique energy cascade from Hcptpy → Tb 3+ → Eu 3+ in siloxane-polyether enables the luminescent films to be not only the multi-color emission, but also provide highly temperature-sensitive over the wide temperature range. The EuTb 15 @SP film for luminescent thermometry performance is fine-tuned to reach a maximum relative sensitivity of 7.26% K −1 at 397 K and shows repeated utilization without sensitivity loss. Furthermore, the multi-color emission ranging from red through yellow to green can be achieved by tuning the Eu 3+ /Tb 3+ molar ratio. Consequently, utilizing siloxane-polyether as matrix has been proven to be an effective strategy for constructing lanthanide-based hybrid films with temperature sensor properties. We believe that the reported strategies for preparing a bimetallic complex-doped siloxane-polyether hybrid film will broaden potential applications.
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高影响因子
Gels
·
2022
·Vol. 8
·期 5
·286
·
IF 4.432
Fei Gao,Xinyu Zhao,Jinglin Liu
Europium trivalent ion (Eu3+)-doped silica nanowires were prepared, and the positioning of Eu3+in the silicon dioxide nanowire matrix was researched. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction analysis (XRD) and energy-dispersive X-ray spectroscope analysis (EDX) were used to characterize the product’s morphology and structure. The representation of Fourier transform infrared spectra (FT-IR) and X-ray photoelectron spectroscopy (XPS) were indicative of the presence of a covalent Eu-O-Si bond. The results suggest that Eu3+was successfully doped into amorphous silica. Furthermore, a sol-gel inorganic−organic co-assembly mechanism model was proposed to illuminate the formation of the rare-earth ion-doped nanowires. In addition, photoluminescent emission of europium ions in a silica matrix was further discussed. It was demonstrated that a 10% content of Eu3+resulted in a quenching effect and after annealing at 650 °C, the europium ions in the nanowires had a high luminescence intensity due to the silica network structure.Keywords:tartaric acid;europium;silica nanowires;sol–gel;photoluminescence
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PubMed
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 26
·期 6
·835-847
·
IF 3.1
Huimin Du,Jie Yang,Xingzuo Liu,Jun Yang,Shanshan Hu
Monoclinic AgTbW2O8:Eu3+ crystals were prepared by a simple one-step hydrothermal method. The phase, morphology and luminescence properties of the obtained phosphors were systematically characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) and photoluminescence (PL). The effects of solution pH, W/Tb molar ratios and reaction temperatures as well as reaction times on the size and morphology of the final products were discussed, and the possible formation mechanism of the almond-like structure was proposed. The down-conversion luminescence properties and energy transfer behavior of the AgTbW2O8:Eu3+ phosphors were studied under ultraviolet light excitation. The emission lights were obtained from green to yellow-green to yellow to red by setting different ratios of Tb3+/Eu3+. The temperature-dependent fluorescence test data showed that AgTbW2O8:Eu3+ phosphors have good temperature stability. In addition, by doping alkali metal ions Li+, Na+, and K+ in AgTbW2O8:Eu3+ phosphors, it is found that the luminescence intensity of phosphors doped with alkali metal ions is enhanced compared with that of phosphors without alkali metal ions, and the phosphor doped with K+ has the largest luminescence intensity, which is due to the introduction of K+ making the crystal field produce the greatest asymmetry.
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JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Lin Qin,Jiahao Chen,Xiaomin Chen,Haibao Shao,Zhiliang Wang
A series of Na 5 YSi 4 O 12 :xEu 3+ (x = 0–100 mol%) red-emitting phosphors were prepared by the solid-state method. The powder X-Ray diffraction (XRD) measurement was introduced and the crystal structure of the phosphors was crystallized in the trigonal system with the space group of R -3c (167). The concentration dependent photoluminescent excitation spectra (PLE), emission spectra (PL) as well as luminescence decay curves were recorded and the optimum doping concentration of Eu 3+ ions was evaluated. The synthesized phosphors can be efficiently excited by ultraviolet (UV) to blue light and emit bright red-emitting. Under the excitation of 266 nm wavelength, several emission bands can be observed, ascribing to the transitions from excited state of 5 D 0 to the ground states of 7 F 0-4 . It is somewhat unexpected that the PL emission from the 5 D 0 → 7 F 0 transition is remarkable, which is principally believed to be forbidden. The intensity and decay lifetime of the emission were measured to vary strongly with temperature, indicating that the as-synthesized silicates with excellent photoluminescence properties could be promised for multifunctional applications. In addition, the luminescence mechanism was briefly discussed.
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高影响因子
JOURNAL OF RARE EARTHS
·
2020
·
IF 3.104
Reziwanguli Yantake,Aierken Sidike,Taximaiti Yusufu
This study presents the photoluminescence characteristic analysis of a series of red phosphors of KAlSiO 4 :1.5 mol%Sm 3+ , x mol%Eu 3+ ( x = 2, 3, 4, 5, 6, 7) prepared via high-temperature solid-phase reaction. The results show that the X-ray diffraction (XRD) refinement results are reliable. The unit cell parameters and volume gradually decrease as the Eu 3+ concentration increases, resulting in a grain size reduction of 10.22%. When x = 6, the emission peaks of Sm 3+ at 564, 601, and 651 nm disappear completely, and the corresponding full width at half maximum becomes 0. At 610 nm, the emission peak intensity of Eu 3+ is increased by a factor of 4.8. The resonant non-radiative energy transfer effect is greater than the co-excitation effect. A maximum energy transfer efficiency of 97.8% is achieved. The integral area at 610 nm is as high as 85%. The color purity of the phosphor is as high as 92.97%, and the internal quantum yield gradually changes from 32% to 51%. Ultimately, these results confirm that the silicate phosphor is suitable for the red component in the three primary color phosphors of white light-emitting diodes.
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高影响因子
MATERIALS LETTERS
·
2020
·
IF 3.204
Ping Huang,Peili Luo,Beiying Zhou,Lianjun Wang,Wan Jiang
Silica glass-ceramics containing highly crystalline LaF 3 :Eu 3+ nanocrystals (NCs) were successfully prepared at a relatively low temperature of 950 °C within a short time of 10 min by Spark Plasma Sintering. The LaF 3 :Eu 3+ NCs were not only well retained without interfacial reaction occurring between LaF 3 :Eu 3+ NCs and silica matrix phases, but also homogeneously dispersed in glass matrix. The luminescence peaks located within reddish-orange spectral scope were registered and identified as the intra-configurational 4 f 6 - 4 f 6 transitions originated from Eu 3+ optically active ions ( 5 D 0 → 7 F J , J = 0–4). By adopting the LaF 3 :Eu 3+ glass-ceramic as color convertor, the fabricated LED shows excellent reddish emission.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xinwei Li,Hualan Xu,Xianming Xia,Feiyan Xie,Shengliang Zhong,Dekang Xu
Sc 2 W 3 O 12 is an important host matrix for rare-earth doped luminescence. However, the conventional method to prepare the material is solid-state reaction, which results into coarse and irregular morphologies. In this work, Eu 3+ doped Sc 2 W 3 O 12 phosphors with high crystallinity and pure phase were successfully synthesized via one-step hydrothermal method . It was found that the crystalline phase changed from Sc 2 W 3 O 12 phase to Na 4 Sc 2 (WO 4 ) 5 phase when the molar ratio between Sc(NO 3 ) 3 and Na 2 WO 4 decreased. The temperature-dependent X-ray diffraction analysis was performed to prove the negative thermal expansion property of Sc 2 W 3 O 12 . A systematic study on the effect of reaction time, temperature and Eu 3+ doping concentration was explored. It was also found that the as-prepared samples displayed tunable emission colors, ranging from blueish white to orange red. Particularly, the white light emission with the chromaticity coordinate of (0.3395, 0.3289) can be realized in Sc 2 W 3 O 12 : 5% Eu 3+ . What's more, the photoluminescence properties of the samples were investigated under different ambient temperatures between 97 and 280 K. The result clearly showed energy transfer between Eu 3+ and WO 4 2− . The above results suggested that Sc 2 W 3 O 12 :Eu 3+ can be excellent candidate for solid-state lasing, panel display and WLEDs.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Qi Sun,Shaoying Wang,Balaji Devakumar,Liangling Sun,Jia Liang,Thangavel Sakthivel,Sanjay J. Dhoble,Xiaoyong Huang
A series of novel high-brightness double perovskite tantalate Eu 3+ -activated Ca 2 LuTaO 6 (CLT) red-emitting phosphors with high thermal stability were successfully synthesized by a high-temperature solid-state method. X-ray diffraction (XRD), emission and excitation spectra, decay curves, temperature-dependent photoluminescence spectra, CIE chromaticity coordinates, as well as internal quantum efficiency (IQE) were used to analyze these phosphor samples. Under 396 nm excitation, the CLT:Eu 3+ phosphors gave brilliant red emission peaking around 616 nm due to the 5 D 0 → 7 F 2 transition of Eu 3+ ions. The optimal Eu 3+ doping concentration was 40 mol%, and moreover, the critical distance ( R c ) and θ were 8.55 Å and 5.01, respectively. Thus, the dipole-dipole interaction may be responsible for the energy transfer mechanism of Eu 3+ activators in the CLT:Eu 3+ phosphors. In addition, the color purity of CLT:0.4Eu 3+ sample was calculated to be 95.8% and its IQE was found to be as high as 74%. Impressively, the integrated emission intensity of CLT:0.4Eu 3+ was about 3.79 times higher than that of commercial Y 2 O 3 :Eu 3+ red phosphors under 396 nm excitation. More importantly, the CLT:0.4Eu 3+ sample exhibited excellent thermal stability. Therefore, these superior luminescence properties of CLT:Eu 3+ phosphors demonstrated their potential applications in white light-emitting diodes (WLEDs) as red color converters.
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高影响因子
CELLULOSE
·
2013
·Vol. 20
·期 2
·841-848
·
IF 3.476
Huo Jiansheng,Zheng Yuhui,Pang Shuting,Wang Qianming
In this paper, a novel luminescent hydrogel was successfully prepared by incorporating Tb-HSA (HSA = Human Serum Albumin) complex into cellulose host. The green luminescence intensities of Tb(III) exhibited on – off changes in terms of pH variation. At the same time, europium activated phosphor (GdVO 4 :Eu 3+ ) was immobilized into the cellulose hydrogels through two approaches. The photophysical properties of luminescent gels with the temperature variation were investigated by fluorescence. The new group of soft materials will display task-specific usages in sensing fields.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2013
·
IF 1.913
Jintai Lin,Zhan Zhou,Qianming Wang
GdNbO 4 :Eu 3+ and LuTaO 4 :Eu 3+ have been successfully prepared with different fluxes (NaCl, KCl, NaCl and KCl) by the molten salt method. X-ray diffraction (XRD) patterns illustrated that well crystallized GdNbO 4 :Eu 3+ and LuTaO 4 :Eu 3+ in the presence of fluxes were formed under reduced temperature (900 °C) in contrast to conventional method (GdNbO 4 :Eu 3+ : around 1200 °C; LuTaO 4 :Eu 3+ : around 1500 °C). Scanning electron microscope (SEM) images revealed that well dispersed particles were achieved (granular or rod-like structures). Meanwhile, the photo-luminescent studies demonstrated that both niobate and tantalate are efficient hosts to sensitize europium red emissions. The results indicated that GdNbO 4 :Eu 3+ using NaCl as the flux gave much enhanced red emission whereas LuTaO 4 :Eu 3+ synthesized with the assistance of mixed salts (NaCl–KCl) achieved the best luminescence.
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高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2015
·Vol. 2015
·期 32
·5419-5425
·
IF 2.942
Jie Chen,Ye Sheng,Xiuqing Zhou,Hui Zhang,Zhan Shi,Haifeng Zou
Graphical New interesting luminescent silica nanowires doped with Eu 3+ are prepared by the microemulsion method accompanied with a sol–gel process. The interaction between Eu 3+ ions and SiO 2 matrix and the luminescent properties of Eu 3+ -doped SiO 2 nanowires are investigated. Under UV excitation, the Eu 3+ -doped silica nanowires exhibit red emission. Uniformly sized and shaped Eu 3+ -doped silica nanowires were conventionally fabricated by the microemulsion method accompanied with a sol–gel process for the first time. The products were characterized by different techniques, and their luminescence properties were investigated and compared. The scanning electron microscopy and transmission electron microscopy images demonstrated that the as-synthesized Eu 3+ -doped silica nanowires were formed in high yield with a smooth surface and a uniform diameter of about 130–150 nm. The results of FTIR spectroscopy, energy-dispersive spectroscopy, and X-ray diffraction showed that the Eu 3+ ions were doped into the silica network structure in the form of Si–O–Eu bonds. The effect of the Eu 3+ concentration on the luminescent intensity was investigated, and the highest emission intensity was found at the composition of 20 mol-% Eu 3+ . The obtained Eu 3+ -doped silica nanowires exhibited characteristic luminescent emission of Eu 3+ at λ = 613 nm and apparent concentration quenching above the concentration of 20 mol-% Eu 3+ . The growth processes of the silica nanowires were explained in detail on the basis of a modified vapor–liquid–solid mechanism.
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高影响因子
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