JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Zhan Shu,MengQi Li,Lu Gan,Lijia Wan,Xiaoling Chen,Xiaohang Zhang,Weijun Gui
Highly luminescent GdVO 4 :Eu 3+ /carbon dots (CDs) nanocomposite was synthesized by hydrothermal deposition method for the first time. With the use of dialyzed CDs solution as precursor, the synthetized composite shows negligible emission intensity of CDs. On replacing the dialyzed CDs solution with the crude one, highly luminescent composite can be obtained successfully. Based on the analysis of XPS and FT-IR spectra, one can deduce that the existence of a large amount of citrate anions, ethylenediamine cations and polymer-like CDs in the crude CDs solution make it as nutrient solution of CDs, which can not only facilitate growth of CDs on the surface of GVE, but also greatly prevent nitrogen atoms from falling off the particles during the hydrothermal deposition process. For the dialyzed CDs solution, due to the ions and polymer-like CDs being thoroughly dialyzed, the coated CDs are fragile during hydrothermal deposition process. Besides, the effects of different dosages of ammonia on emission intensities of the two composites are studied. Based on the designable patterns for security application, one can think that the highly luminescent composite is one of the most promising candidates in the anti-counterfeiting field.
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JOURNAL OF FLUORESCENCE
·
2021
·Vol. 31
·期 6
·1947-1957
·
IF 2.217
Shu Yun,Dai Tao,Ye Qiuyu,Jin Dangqin,Xu Qin,Hu Xiaoya
Using two-dimensional (2D) nickel-based metal organic framework (Ni-MOF) nanosheets as a matrix, Eu 3+ and Ag + were incorporated to synthesize Ag/Eu@Ni-MOF with double luminescence centers of Eu 3+ ion (615 nm) and organic ligand (524 nm). And a ratiometric luminescence sensor is constructed based on Ag/Eu@Ni-MOF for sensitive detection of biothiols in aqueous solutions. The dual-emissive fluorescence properties can be tuned by changing the amounts of Ag + ions doping. The results of temperature and pH effects on the fluorescence of Ag/Eu@Ni-MOF indicates that the Ag/Eu@Ni-MOF is a temperature-sensitive material and the fluorescence of Ag/Eu@Ni-MOF can keep stable over a wide pH range. Due to the binding of -SH in cysteine (Cys) and glutathione (GSH) with Ag + , the ligand luminescence was significantly inhibited by weakening the Ag + influence on the energy transfer process in the MOFs. Therefore, ratiometric fluorescent sensing of biomolecular thiols was realized based on the dual-emission Ag/Eu@Ni-MOF. More importantly, the fluorescence color change can be observed with naked eyes to realize visual detection. The ratiometric fluorescent sensor exhibits high performance for Cys and GSH detection with a wide linear range of 5-250 µM and a relatively low detection limit of 0.20 µM and 0.17 µM, respectively. Furthermore, the biothiols content in human serum was determined with satisfactory results. It proves the Ni-MOF nanosheets can be used as a stable matrix for construction luminescent MOFs for the first time, and validate the great potential of Ag/Eu@Ni-MOF as a ratiometric fluorescent probe for point-of-care testing (POCT) in disease diagnosis.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Jiangwei Du,Xiaoyan Pan,Zepeng Liu,Yetao Jing,Beicheng Wang,Laihui Luo,Jun Wang,Peng Du
To fulfill bifunctional applications of the white light-emitting diode (white-LED) and optical thermometry, Eu 3+ -activated Ca 2 Gd 8 Si 6 O 26 phosphors were prepared. Upon 394 nm excitation, dazzling red emission with admirable color purity of 93.8% was seen and the optimal doping content of the Eu 3+ ions in the Ca 2 Gd 8 Si 6 O 26 host was 30 mol%. The Ca 2 Gd 8 Si 6 O 26 :2.4Eu 3+ phosphors showed a high quantum efficiency of 53.9%. Via investigation of the relation between the dopant content and emission intensity, one knows that the concentration quenching mechanism was decided by electric dipole-dipole interaction. Though estimating the values of Ω 2 and Ω 4 based on the Judd-Ofelt theory, it was proved that the Eu 3+ ions took the low symmetry sites in the Ca 2 Gd 8 Si 6 O 26 host lattices. Furthermore, the temperature-dependent emission spectra manifested that the resultant compounds had splendid thermal stability with activation energy of 0.25 eV. Utilizing the prepared compounds as the red-emitting components, a white-LED was packaged and it can emit high quality white light with high color rendering index (84.8) and low correlated color temperature (4981 K). Additionally, through analyzing the temperature-dependent excitation spectrum, the optical thermometric behaviors of the designed phosphors were studied. The maximum absolute and relative sensitivities of the studied compounds were 0.0014 K -1 and 0.276% K −1 , respectively. These results provided a new insight into searching for novel bifunctional luminescent materials towards white-LED and ratiometric optical thermometer applications.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Xiaoyong Huang,Heng Guo,Jia Liang,Shaoying Wang
In this paper, we reported on the photoluminescence properties of novel Eu 3+ -activated KBaLu(MoO 4 ) 3 red-emitting phosphors. Under 395 and 465 nm excitations, the as-prepared samples gave bright sharp red emissions around 592, 615, 655, and 701 nm, corresponding to 5 D 0 → 7 F J (J = 1, 2, 3, and 4) transitions of Eu 3+ ions. The 615 nm red emission due to the 5 D 0 → 7 F 2 transition was dominant in the emission spectra, indicating the Eu 3+ ions occupied non-inversion centrosymmetric sites in KBaLu(MoO 4 ) 3 host lattice. Eu 3+ doping concentration dependent luminescence properties were studied, and the KBaLu(MoO 4 ) 3 :0.8Eu 3+ sample exhibited the strongest emission intensity. The CIE color coordinates and color purity of the optimal KBaLu(MoO 4 ) 3 :0.8Eu 3+ sample were determined to be (0.6655, 0.3311) and 96.7%, respectively. Besides, temperature-dependent emission spectra demonstrated that the KBaLu(MoO 4 ) 3 :0.8Eu 3+ phosphors also exhibited excellent thermal stability (I 423k /I 303k = 88%) with activation energy △E of 0.204 eV. These obtained results indicated that the newly discovered KBaLu(MoO 4 ) 3 :Eu 3+ red phosphors were promising color converters for application in white light-emitting diodes and display devices.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 24
·8171-8182
·
IF 7.059
Jing Wang,Jin Liu,Jing Wang,Yao Wang,Jie Cao,Lin Hou,Ruifen Ge,Jinnan Chi,Linjun Huang,Junlan Guo,Abdur Raheem Aleem,Zhengxing Song,Shree Krishna Tamang,Jixian Liu,Guanghui Wang,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
The in vivo trace content of some transition-metal ions is important for biological systems and an inappropriate content may cause diseases. With the purpose of developing an efficient sensing system for Cu2+, this work demonstrates the excellent sensing property of Tb3+/Eu3+-induced polysaccharide aggregates. Photophysical measurements indicate that at a Cu2+ concentration of 20 μM, the fluorescence of Tb3+-induced polysaccharide aggregates (TIPAs) or Eu3+-induced polysaccharide aggregates (EIPAs) can be quenched rapidly and sensitively. Addition of EDTA to chelate Cu2+ restores the fluorescence, indicating that the fluorescence quenching in the presence of Cu2+ is reversible. Initial cytotoxicity experiments with mammalian cells show that the luminescent lanthanide complexes are cytotoxic, but complexing the lanthanides to polysaccharides renders them cytocompatible. These new complexes integrate the advantages of superior lanthanide fluorescence, compatibility with aqueous systems, and cytocompatibility. The microparticle formulation EIPA can be used for applications that require the complexes to be removed from the sample (e.g. by centrifugation), whereas the nanoparticle formulation TIPA is suitable for cell labeling applications with excellent water-solubility, biocompatibility, non-cell toxicity, and cell imaging.
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LUMINESCENCE
·
2023
·Vol. 38
·期 8
·1521-1528
·
IF 2.9
Zhan Shu,Mingzhe Du,Mengqi Li,Yanghui Liu,Lu Gan,Xiaohang Zhang,Weijun Gui
To obtain optimal luminescence, 0.12 g of GdVO 4 :3%Eu 3+ nanocrystals (NCs) and different volumes of nitrogen-doped carbon dots (N-CDs) crude solution were used as precursors, and the composite synthesized using the hydrothermal deposition method showed optimal luminescence when 11 ml (2.45 mmol) crude solution was used. In addition, similar composites with the same molar ratio as GVE/cCDs(11) were also prepared with the hydrothermal and physical mixing processes. Based on the test results of XRD, XPS, and PL spectra, for the composite GVE/cCDs(11), the highest (lowest) peak intensity of the C–C/C=C (C=O/C=N) bond, which was 1.18 (0.75) times that of GVE/cCDs-m, indicated most N-CDs deposition and led to their highest emission intensity under 365 nm excitation, although nitrogen atoms in the composite were shed slightly during the deposition process. Finally, as can be seen from the patterns designed for security applications that the optimally luminescent composite is one of the most promising candidates in the anti-counterfeiting field.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2023
·Vol. 37
·期 6
·e7096
·
IF 3.9
Ping Zhang,Yuchi Zhang,Xianliang Li,Yan Xu
A radial mesoporous silica (mSiO 2 ) supported Eu 3+ -functionalized carbon dots (CDs) nanocomposite (mSiO 2 -CDs-Eu) was successfully prepared using citric acid as CD precursors, showing specific ratiometric tetracycline (TC) fluorescence sensing behavior. The blue fluorescence of CDs is quenched by the internal filtering effect with TC, and the red fluorescence intensity of Eu 3+ ions is improved on account of an antenna effect. The self-calibrated ratiometric fluorescence sensing of TC by mSiO 2 -CDs-Eu showed a minimum detection limit of 30 nM. In addition, a mSiO 2 -CDs-Eu hybridized polyvinylidene fluoride (PVDF) film was developed for optical temperature sensing with a high-temperature sensitivity of 1.69% °C −1 in the physiological temperature range of 25–45°C and a temperature resolution greater than 0.04°C. This work demonstrates a feasible way in fabricating dual-functional mSiO 2 -CDs-Eu nanocomposite with optical ratiometric sensing properties toward both TC and temperature changes, opening its promising applicability for food security and temperature monitoring.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Panpan Du,Qinghong Meng,Xuejiao Wang,Qi Zhu,Xiaodong Li,Xudong Sun,Ji-Guang Li
Li 6 CaLa 2 Nb 2 O 12 garnet is known as an electrolyte for Li + -batteries. The sol–gel processing of this work yielded a series of phase pure Li 6 CaLa 2(1− x ) Nb 2 O 12 : x Eu 3+ garnet phosphors (LCLNG: x Eu; x = 0–0.40) that are efficiently excitable with either near-ultraviolet (NUV, ~350–400 nm) or blue (~450–475 nm) light to produce dominantly strong 610 nm red emission. Increasing Eu 3+ substitution for La 3+ (larger x ) led to smaller cell constant and lower symmetry of the (La/Ca)O 8 dodecahedron, as revealed via Rietveld structure refinement, and meanwhile narrower bandgap. The excitation/emission behaviors and high quenching concentration of Eu 3+ ( x = 0.35) were interpreted for the phosphor series by considering bandgap energy, (La/Ca)O 8 distortion and local arrangement of atoms. The LCLNG:0.35Eu optimal phosphor was analyzed to have absolute quantum yields of ~51% (λ ex = 393 nm) and 65% (λ ex = 463 nm), fluorescence lifetime of ~0.70 ms and color coordinates of around (0.65, 0.35) at room temperature and to be able to retain as high as ~85% of its room-temperature intensity at 423 K for the 610 nm emission. Application of LCLNG:0.35Eu further indicated that this phosphor has the potential to be used in NUV-excited LEDs.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2019
·Vol. 411
·期 18
·4221-4229
·
IF 3.286
Long Zerong,Shen Shilin,Lu Yi,Lan Wei,Chen Jia,Qiu Hongdeng
Herein, rare-earth europium doped in Gd 2 O 3 @SiO 2 -based molecularly imprinted polymer (MIP) composite nanospheres with a multilayer core-shell structure was successfully prepared via a facile and versatile layer-by-layer assembly strategy of combination with sol-gel, hydrothermal, and surface imprinting procedure. The rare-earth Gd 2 O 3 :Eu 3+ was embedded into the inner portion of the imprinted polymer which was well-suited for fluorescent monitoring carbaryl selectively. Results showed that the recognition process of the nanosensor for carbaryl was fast and reached dynamic equilibrium at ca. 20 min. The fluorescence intensity ( F 0 / F ) is linearly related to the concentration of carbaryl [ Q ] within the range of 16–80 μg mL −1 , and the linear equation is F 0 / F = 0.8909 − 9.775 × 10 −4 [ Q ] ( R = 0.9963) with 10 μg mL −1 as the detection limit. Competition experiments showed that other analogues (methomyl, aldicarb, and isoprocarb) have nearly no interference in the detection of carbaryl. Moreover, this MIP nanosensor was successfully applied to detect carbaryl in green tea samples without pretreatment. The study afforded an efficient and desirable fluorescence sensor for carbaryl detection in a complicated matrix, which hopefully will be used for biomedical/chemical sensing recognition.
Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
·
2014
·
IF 4.058
Jiansheng Huo,Yuhui Zheng,Qianming Wang
Novel red-emitting Eu 3+ -activated La 2 − x Gd x (MoO 4 ) 3 − y (WO 4 ) y phosphors with well-defined one-dimensional nanostructures were synthesized via a supersonic microwave co-assistance (SMC) method for the first time at very low temperature (60 °C). Scanning electron microscopy studies substantiated that these phosphors are very uniform. The crystal structure and luminescent properties were characterized by powder X-ray diffraction patterns (XRD) and photoluminescence measurements (PL) respectively. An intense red emission at 615 nm ( 5 D 0 → 7 F 2 ) was detected under the excitation at 280 nm. The PL properties of La 2 − x Gd x (MoO 4 ) 3 − y (WO 4 ) y : Eu 3+ with different ratio of La/Gd or MoO 4 /WO 4 have also been investigated in detail. Furthermore, the optimized phosphor was embedded into the poly-hydroxyethylmethacrylate(HEMA) gel and the corresponding luminescent gel was achieved.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2015
·Vol. 77
·期 1
·152-159
·
IF 1.532
Zhang Qiang,Sheng Ye,Zheng Keyan,Zou Haifeng
Abstract This work focuses on the construction of a series of novel chemically bonded inorganic–organic rare earth hybrid materials using 3,4-bis(pyridin-4-ylmethoxy)benzoic acid as an organic bridge molecule that can both coordinate with rare earth ions and form an inorganic network with titanium isopropylate and aluminum isopropylate after cohydrolysis and copolycondensation through a sol–gel process. Measurements of the properties of these materials show that the terbium systems present high thermal stability and amorphous structure features. UV excitation in the organic component resulted in strong green emission from Tb 3+ ions due to an efficient ligand-to-metal energy-transfer mechanism. Graphical Abstract
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Chengmei Sun,Chengcheng Xu,Wenzhen Ren,Fengya Hu,Jun Yuan,Qingru Wang,Yanru Xie,Kai Wang,Dong Zhang
ZnTiO 3 :Eu 3+ ,Mn 4+ phosphors with hexagonal and cubic structure are synthesized by solvothermal method. The structure of ZnTiO 3 depends on precursors and the annealing temperature. Inverse spinel Zn 2 TiO 4 phase reveals the highest thermostability compared with cubic ZnTiO 3 and hexagonal ZnTiO 3 phases. The different phases of ZnTiO 3 crystals exhibit different photoluminescence properties. The forbidden transition of 4 A 2 g → 2 T 2 g for Mn 4+ is observed in Zn 2 TiO 4 and hexagonal ZnTiO 3 (h-ZnTiO 3 ) due to the decreased symmetry. The zero photon line (ZPL) assigned to 2 E g → 4 A 2 g transition of Mn 4+ is absent in all type ZnTiO 3 phases. A sharp emission peak at 714 nm assigned to ν 6 (Stokes emission) mode of Mn 4+ in h-ZnTiO 3 is present when the temperature was below 270 K, and increases sharply in intensity with the temperature decreasing. The similar PL spectra of cubic ZnTiO 3 and Zn 2 TiO 4 co-doped with Eu 3+ and Mn 4+ show a wide emission band composed of Stokes and anti-Stokes modes. The calculated nephelauxetic parameter increases from 0.84 to 1.03 and 1.18 for Mn 4+ in h-ZnTiO 3 , cubic ZnTiO 3 and Zn 2 TiO 4 , respectively, indicating the covalency decreasing, which causes the red shift of ZPL in h-ZnTiO 3 . The Mn 4+ emissions show stronger temperature dependence than that of Eu 3+ , especially for that in h-ZnTiO 3 matrix. Based on the fluorescence intensity ratio between I Eu 3+ and I Mn 4+ , the highest relative temperature sensitivity of 2.46 %K −1 is observed in cubic ZnTiO 3 (c-ZnTiO 3 ) and Zn 2 TiO 4 . Under the excitation at 550 nm, the highest relative sensitivity of 2.9 %K −1 is achieved in c- and h-ZnTiO 3 mixed phases.
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