CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xiaoping Jiang,Yue Guo,Lixi Wang,Qitu Zhang
The integration of dynamic photoluminescence and photochromism to achieve dual-modal characteristics can substantially elevate the security of anticounterfeiting measures. In this study, a novel bifunctional phosphor, namely CaAl 12 O 19 :Eu, Tb possessing dynamic photoluminescence and photochromism, is developed by the sol-gel combustion method. As the duration of exposure to 254 nm ultraviolet radiation increases, the CaAl 12 O 19 :Eu, Tb phosphors exhibit exceptional dynamic luminescent characteristics and pronounced color changes. Furthermore, this exposure results in a photochromic phenomenon on the surface of the samples, causing a shift from white to light brown. With an increase in Tb doping concentration, distinct and diverse chromatic variations easily discernible are observed by the naked eye. In addition, the mechanisms underlying the dynamic photoluminescent and photochromic characteristics are analyzed herein. Furthermore, the application of the bifunctional phosphor CaAl 12 O 19 :Eu, Tb for advanced dual-modal multicolor anticounterfeiting is explored, offering enhanced security against duplication attempts.
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Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 12
·4746-4755
·
IF 6.482
Xiao Gong,Hang Jiang,Mengyan Cao,Zhihui Rao,Xiujian Zhao,Alberto Vomiero
Heavy-metal-free quantum dots (QDs) are promising luminophores for luminescent solar concentrators (LSCs) because of environmental friendliness, which is essential for industrial applications. In order to keep high optical quality and inhibit aggregation-induced quenching, usually QDs can only be loaded at low concentration in a polymer optical waveguide material for LSCs, which significantly impairs the power conversion efficiency (PCE). Thus, it is a challenge to fabricate high-performance LSCs with high QD loading. Here, dual emission Eu-doped ZnO QDs with strong solid-state fluorescence are synthesized via a simple sol–gel method, which enables two characteristic photoluminescence peaks at 551 nm and 614 nm. Furthermore, Eu-doped ZnO QDs with dual fluorescence emission are for the first time reported to be applied in LSCs. The performance of LSCs can be influenced by the loading concentration of Eu-doped ZnO QDs in polyvinyl pyrrolidone (PVP) films. The obtained external optical efficiency (ηopt) of the LSCs based on Eu-doped ZnO QDs can be relatively high (4.37%) compared to the reported LSCs with a similar area when the loading concentration of Eu-doped ZnO QDs is up to 13.2% because of both their high photoluminescence intensity and dual fluorescence emission. Our results demonstrate that dual emission Eu-doped ZnO QDs with strong solid-state fluorescence are promising candidates as luminophores for LSCs.
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CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hang Zhang,Hang Yang,Guogang Li,Shiqi Liu,Haoran Li,Yuming Gong,Yujun Liang,Yongjun Chen
Currently, phosphor materials play an important role in designing noncontact remote optical thermometers. Although many approaches have contributed to improve thermometric performance of optical thermometers including optimization of host materials, size of nanoparticles , dopant type and concentration as well as excitation density and phonon energy engineering, the development of highly sensitive optical thermometric materials is still a challenge. Hence, we developed novel CaNb 2 O 6 (CNO):Ln 3+ (Ln 3+ = Eu 3+ /Sm 3+ /Dy 3+ /Tb 3+ ) phosphors as highly thermometric materials and proposed a novel strategy for further enhancing its thermometric performance via adding the intensity of indicator signal by co-doping Bi 3+ ions in current phosphor system. Typically, the as-prepared CNO:Ln 3+ phosphors present a broad blue emission around 470 nm originated from NbO 6 octahedral groups and some respective emission lines derived from the characteristic f-f transitions of Ln 3+ ions. Based on the diverse thermal quenching performance between blue emission and Ln 3+ ions emission , the temperature sensitivities of CNO:Ln 3+ were investigated in detail. Among them, the maximum relative sensitivity of CNO:Eu 3+ sample reached 1.991% K −1 in the range of 298–448 K and remained 97% after five temperature cycles. Furthermore, an obvious discoloration was discovered during temperature cycle testing in CNO:Ln 3+ samples under 254 nm UV lamp. Through doping Bi 3+ ion, the strongest intensity of indicator signal is 24 folds that of CNO host. Correspondingly, the relative sensitivity of CNO:Bi 3+ , Eu 3+ sample is obviously improved to 3.793% K −1 in the range of 298–523 K, owing to a larger range of the FIR value and a wider drop range of indicator signal. This work opens up an effective pathway to improving thermometric performance of optical thermometers by enhancing the intensity of indicator signal of employed phosphor materials.
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BIOSENSORS & BIOELECTRONICS
·
2019
·
IF 9.518
Yu Cui,Fei Chen,Xue-Bo Yin
A Eu-metal organic framework (Eu-MOF) probe with dual-emission was reported for the ratiometric fluorescence detection of H 2 O 2 and glucose. Because of the special nucleophilic reaction between boric group and H 2 O 2 , Eu 3+ and 5-boronobenzene-1,3-dicarboxylic acid (BBDC) were selected to synthesize the functional MOF probe via a simple one-pot solvothermal method . The Eu-MOF shows dual-emission at 370 and 623 nm with the single excitation at 270 nm due to the energy transfer efficiency change for antenna effect procedure. After addition of H 2 O 2 , the red emission of Eu-MOF weakened and the blue emission enhances immediately under 270 nm irradiation, so the ratiometric fluorescence detection is established. Moreover, the obvious color change for visual measuring of H 2 O 2 and glucose is illustrated to reveal the merit of Eu-MOF probe. The proposed method was demonstrated to be highly sensitive and selective for H 2 O 2 and glucose, with the low detection limits of 0.0335 and 0.0643 μM, respectively. The established boric-acid-functional Eu-MOF sensing platform was proved as the powerful probe for H 2 O 2 and the metabolites involved in H 2 O 2 -generating reaction.
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INORGANIC CHEMISTRY
·
2019
·
IF 4.85
Xinrui Zhang,Xianghe Kong,Liyong Yuan,Zhifang Chai,Weiqun Shi
Tetradentate 1,10-phenanthroline-2,9-dicarboxamide (PDAM) derivatives have been well documented as effective binding ligands toward MA(III) and Ln(III), while the structural analysis and species determination of the complexes are still limited. Herein, we report a combined study on the coordination of Eu(III) with PDAM derivatives using electrospray ionization mass spectrometry (ESI-MS), time-resolved laser-induced fluorescence (TRLIF), and density functional theory (DFT) calculations. PDAM derivatives here involve N,N′-diethyl-N,N′-diethyl-2,9-diamide-1,10-phenanthroline (Et-Et-DAPhen), N,N′-dibutyl-N,N′-dibutyl-2,9-diamide-1,10-phenanthroline (But-But-DAPhen), and N,N′-dihexyl-N,N′-dihexyl-2,9-diamide-1,10-phenanthroline (Hex-Hex-DAPhen). The collision-induced dissociation (CID) test shows that these alkyl-DAPhen ligands coordinate strongly with Eu(III), given that the coordination moieties remain intact during CID. The 1/2 EuIII–L species was found to be the dominant component for all three ligands, as evidenced by ESI-MS and fluorescence titration. The fluorescence decay results indicate that the hydration numbers of Eu(III) are reduced from 9 to 1 upon complexation, in agreement with the fact that the 1/2 EuIII–L species are formed, and eight water molecules are exactly replaced by eight donor atoms of two alkyl-DAPhen ligands. In addition, the DFT calculations suggest that the 1:2 EuIII–L species is more stable than the 1/1 EuIII–L species and the Eu–oxygen/nitrogen (Eu–O/N) bonds have a dominant ionic character, with the O atoms having stronger electron-donating abilities toward Eu(III) in comparison to the N atoms.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 321
·期 2
·733-745
·
IF 1.186
Hu Peizhuo,Nan Yu,Tai Wenya,Shan Qiang,Zhong Yi,Lei Zhiwei,Liu Tonghuan,Chen Suwen,Qian Lijuan
Modification of silica gel by butanedioic anhydride (SiO 2 –BDAH) results in efficient adsorbents for removal of U(VI), Th(IV), and Eu(III) from aqueous solutions. SiO 2 –BDAH was characterized by Fourier Transform infrared spectroscopy, elemental analysis, N 2 adsorption–desorption isotherms, thermogravimetic analysis, and potentiometric titration. The effect of contact time, pH, and initial concentration of radioactive solutions and temperature on the adsorption capacity of the sorbent was investigated. The sorption equilibrium times of U(VI), Th(IV), and Eu(III) onto SiO 2 –BDAH were 1.5, 2, and about 10 h. The sorption percentages of U(VI), Th(IV), and Eu(III) increased with increased pH from 1 to 5. The sorption process of U(VI), Th(IV), and Eu(III) can be described by the Langmuir model, with sorption capacities of 5.10 × 10 −5 , 5.06 × 10 −5 , and 3.44 × 10 −5 mol/L, respectively. The enthalpy and entropy changes were all positive, whereas the free energy changes were negative. This study indicated that SiO 2 –BDAH can remove U(VI) and Th(IV) at the same time in the presence of multiple ions from waste water quickly.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Guang-Xin Xiang,Guo-Jun Wang,Zhi-Jun Zhang,He Feng,Jing-Tai Zhao,Jiao Wang,Xin-Yuan Sun,Ri-Hua Mao,Yong Wang
The uniform 1D nano-rods of RE 3+ doped Ln 7 O 6 F 9 ( Ln = Y and Lu; RE = Pr, Sm and Eu) were synthesized through a facile two-step hydrothermal method without extra fluorine source followed by post-heat treatment. The phase formation, morphologies, as well as photoluminescence properties of the materials were investigated. The precursor composition was determined to be Ln (OH) 1.69 F 1.31 using the Fourier transform infrared spectrum (FT-IR), thermal gravimetric and differential scanning calorimetry (TG-DSC). The average lengths of Y 7 O 6 F 9 and Lu 7 O 6 F 9 were about 6.8 and 7.9 μm, respectively, with the average width of about 650 nm. It was interesting that the tip of the nano-rods exhibits a straight line and divergent umbrella shaped bifurcation for Y 7 O 6 F 9 and Lu 7 O 6 F 9 , respectively. Upon ultraviolet excitation, Pr 3+ , Sm 3+ and Eu 3+ ions in Ln 7 O 6 F 9 showed blue, orange and red emissions originating from their characteristic f-f transitions. In addition, the 4 f 1 5 d 1 → 4 f 2 band emissions (340–450 nm) as well as typical 4 f 2 → 4 f 2 line emissions (450–700 nm) of Pr 3+ were observed in Pr 3+ -doped Ln 7 O 6 F 9 . For Sm 3+ -doped Ln 7 O 6 F 9 , only the typical f - f transitions of Sm 3+ were observed with the absence of charge transfer (CT) band. However, the broad excitation bands at 255 nm attributing to the charge transfer transition of Eu 3+ (i.e. O 2− → Eu 3+ CT) were observed in Eu 3+ -doped Ln 7 O 6 F 9 .
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Analytical Methods
·
2024
·
IF 2.7
Moru Zhang,Chunyun Deng,Jing Chen,Shucai Liang
In this work, a hydrophilic Eu-based ratiometric fluorescence nanosensor (PAAC-Eu) was developed for Cu2+ ion detection in aqueous solution and imaging in living cells. The sensor was prepared via a simple one-step reaction at room temperature, leveraging the synergistic coordination of commercially accessible polyacrylic acid (PAA) and coumarin-3-carboxylic acid (CCAH) with Eu3+ ion. PAAC-Eu was easy to disperse in aqueous media and exhibited two characteristic emissions at 406 nm and 618 nm, respectively, upon excited at 350 nm. Cu2+ ion could bind with the free carboxyl groups in PAAC-Eu within 10 min leading to a decrease in the fluorescence at 618nm (I618), but negligible effect on the fluorescence at 406 nm (I406). Accordingly, a rapid, sensitive and selective method for detecting Cu2+ ion was established. By this method, Cu2+ ion assay could be completed within 30 min. A good linear relationship was obtained between I406/I618 and Cu2+ ion concentration at 0-20.0 μM (0-1.28 mg L-1) with the detection limit as low as 0.175 μM (11.2 μg L-1). The proposed method has been successfully applied to quantify Cu2+ ion in real water samples. Moreover, a portable paper-based sensor was exploited by loading PAAC-Eu in filter paper, by which the visual detection of Cu2+ ion could be achieved independent of large instruments. Finally, cell experiments have demonstrated the low cytotoxicity and good cell-permeability of PAAC-Eu, and it has been successfully used for ratiometric fluorescence imaging of Cu2+ ion in living cells.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yongtao Li,Xiankuo Wang,Weina Li,Han Xia,Jiao Li,Haina Qi,Xuejian Zhang,Dexin Huang,Huisheng Liu,C.K. Mahadevan
The NaCl:xEu 3+ (x = 0.002, 0.004, 0.006, 0.008, 0.01, 0.02) ceramics were synthesized using a cold sintering method under varying temperature and pressure conditions. The impact of Eu 3+ ions on the structural and optical properties of NaCl ceramics was examined by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), analytical scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), UV–visible spectroscopy, reflectance spectroscopy, photoluminescence (PL) spectroscopy, and fluorescence lifetime measurements. XRD analyses confirmed the incorporation of Eu ions into the matrix lattice. SEM results indicated that the ceramics achieved high density when the uniaxial pressure exceeded 300 MPa. EDS analysis demonstrated a well-distributed presence of rare earth ions, devoid of impurities. PL spectroscopy revealed that the intensity of the emission spectra increased the increase of Eu 3+ concentration and observed the optimal luminescence performance at x = 0.01 mol% and a sintering temperature of 125 °C. XPS results indicated that the Eu ions were predominantly in a trivalent state within the NaCl ceramics. Collectively, the above results provide valuable insights for the preparation of rare-earth doped alkali halide ceramics using cold sintering technology.
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yonghao Wang,Biao Chi,Chengliang Xiao,Dagui Chen,Yongjing Wang,Minghua Liu
In this work, a layered nanocomposite with a superior adsorption ability has been designed and prepared for the preconcentration of Eu(III), a chemical analogue of trivalent lanthanides [Ln(III)] and actinides [An(III)] in nuclear waste. This nanocomposite was obtained by fabricating magnesium silicate (MgSi) of the Talc-phase Mg 3 Si 4 O 9 (OH) 10 on graphene oxide (GO) nanosheets, in which the GO matrix can effectively avoid the agglomeration of MgSi. A hierarchical structure of GO@MgSi with interwoven nano-sized MgSi lamellae dispersedly standing on the surface of GO was observed by scanning electron microscope (SEM) and transmission electron microscopy (TEM). Such a hierarchical structure effectively increases the surface area of MgSi, leading to up to date the highest adsorption capacity (344.82 mg·L −1 ) for enriching Eu(III). Powder X-ray diffraction pattern (PXRD) of Mg 3 Si 4 O 9 (OH) 10 shows that the (0 2 0) and (2 0 0) diffraction peaks disappear after the adsorption of Eu(III), indicating structural changes in MgSi lamellae after adsorption. The infrared absorption spectra (IR) and X-ray photoelectron spectroscopy (XPS) measurements confirm the structural transformations in the Si O tetrahedral and Mg OH octahedral sheet in MgSi, suggesting that MgSi lamella rather than GO sheet might play a dominant role during the adsorption process. The superior adsorption behaviors of GO@MgSi indicate that it is a highly promising and efficient candidate for Eu(III) preconcentration in aqueous solution.
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Materials
·
2024
·Vol. 17
·期 20
·4954
·
IF 3.1
Wenhui Lou,Yang Tang,Haohong Chen,Yisong Lei,Hui Lin,Ruijin Hong,Zhaoxia Han,Dawei Zhang
Eu 3+ -doped Y 2 O 3 -based luminescent materials can be used as a scintillator for electron or high energy β-ray irradiation, which are essential for applications such as electron microscopy and nuclear batteries. Therefore, it is essential to understand their defect mechanisms and to develop materials with excellent properties. In this paper, Y 2 O 3 -based transparent ceramics with different Eu 3+ doping concentrations were prepared by solid-state reactive vacuum sintering. This series of transparent ceramic samples exhibits strong red emission under electron beam excitation at the keV level. However, color change appears after the high-energy electron irradiation due to the capture of electrons by the traps in the Y 2 O 3 lattice. Optical transmittance, laser-excited luminescence, X-ray photoelectron spectroscopy (XPS), and other analyses indicated that the traps, or the color change, mainly originate from the residual oxygen vacancies, which can be suppressed by high Eu doping. Seen from the cathodoluminescence (CL) spectra, higher doping concentrations of Eu 3+ showed stronger resistance to electron irradiation damage, but also resulted in lower emissions due to concentration quenching. Therefore, 10% doping of Eu was selected in this work to keep the high emission intensity and strong radiation resistance both. This work helps to enhance the understanding of defect formation mechanisms in the Y 2 O 3 matrix and will be of benefit for the modification of scintillation properties for functional materials systems.
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RSC Advances
·
2024
·Vol. 14
·期 26
·18432-18443
·
IF 3.9
Jiao Wang,Hemu Pi,Panchao Zhao,Na Zhou
The presence of methyl orange (MO) and ciprofloxacin (CIP) in wastewater poses a serious threat to the environment and human health. Titanium dioxide nanoparticles (TiO2 NPs) are widely studied as photocatalysts for wastewater treatment. However, TiO2 NPs have the drawbacks of high energy required for activation, fast electron–hole pair recombination and difficulty in recovering from water. To overcome these problems, europium decorated titanium dioxide/poly(vinylidene fluoride) (Eu–TiO2/PVDF) membranes were successful prepared in this work by combining the modified sol–gel method and the immersion phase inversion method. The Eu–TiO2/PVDF membranes obtained with the increase of Eu–TiO2 NPs content during the preparation process were named M1, M2 and M3, respectively. The pure PVDF membrane without the addition of Eu–TiO2 NPs was named M0, which was prepared by the immersion phase inversion method and served as a reference. The prepared Eu–TiO2/PVDF membranes could not only adsorb MO, but also degrade CIP under visible-light irradiation. Moreover, the Eu–TiO2/PVDF membranes exhibited adsorption–photocatalytic activity towards a mixture of MO and CIP under visible-light irradiation. Last but not the least, the Eu–TiO2/PVDF membranes exhibited excellent recyclability and reusability, opening the avenue for a possible use of these membranes in sewage-treatment plants.
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