Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 34
·6443-6452
·
IF 7.571
Dan Xiu,Sibo Zhao,Zhenhua Li,Yanan Xu,Yao Wang,Zhijun Zhu,Min Zhang,Christopher D. Snow,Laurence A. Belfiore,Jianguo Tang
In this work, a designed porous DNA crystal with high intrinsic biocompatibility was used as the scaffold material to load fluorescent guest molecules to detect anti-cancer drugs. It is shown here that the synthesized crystals have the characteristics consistent with the designed large solvent channels, and can therefore accommodate guest molecules such as fluorescent proteins that cannot be accommodated by less porous crystals. Eu(TTA)3phen and Tb(acac)3phen lanthanide complexes were individually noncovalently loaded into the porous crystals, resulting in hybrid luminescent DNA crystals. Emodin, an anti-cancer, anti-tumor, anti-inflammatory drug, was found to quench lanthanide complexes in solution or in crystals. Notably, emodin is the active ingredient of Lianhua Qingwen Capsule, an anti-COVID-19 drug candidate. Therefore, the porous DNA crystals reported here have potential applications as a biocompatible and theranostic delivery biomaterial for functional macromolecules.
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Optical Materials Express
·
2021
·Vol. 11
·期 9
·2828-2838
·
IF 3.442
Taisen Li,Jin Liu,Xinzhi Wang,Abdur Raheem Aleem,Yao Wang,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
Multimodal nanoprobes are of great significance in clinical diagnosis, because they integrate the advantages of multiple imaging methods. The combination of multiple imaging modes provides more comprehensive and complex information than single-mode imaging, which can greatly improve clinical diagnoses. In this paper, Gd3+ and Tb3+ co-induced polyelectrolyte nanoaggregates (GTIPAs) are introduced as a novel dual-mode imaging probe. Containing gadolinium and terbium, GTIPAs are regular spherical nanoparticles, whose diameters are about 150 nm. As a fluorescent nanomaterial, GTIPAs have strong and stable luminescence intensity. At the same time, as an MRI contrast agent, GTIPAs exhibit a good contrast effect and a high longitudinal relaxation rate. In addition, the polyelectrolytes reduce the cytotoxicity of the complexes, confering excellent biocompatibility and water solubility. Therefore, GTIPAs are non-toxic luminescence/magnetic resonance dual-mode imaging probes.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 43
·15433-15442
·
IF 4.174
Yini Mao,Zhiyi Wang,Rui Ye,Li Jiang,Shanshan Hu,Jun Yang
Octahedral [CaY]F2 crystals with an average particle size of 1 μm were synthesized via a mild one-step hydrothermal route without employing any surfactants. Various morphologies, including cubes, truncated cubes, truncated octahedrons, and spheres, were achieved via manipulating the amount of EDTA used, and a possible growth mechanism was proposed based on the surface energies of different crystal planes and the influence of the surfactant. XRD, SEM, EDS, TEM, HRTEM, and PL analysis were used to characterize the products. The effects of the morphologies and Li+ doping concentrations on the luminescence intensities of the [CaY]F2:Ce3+/Tb3+ phosphors were explored, and the strongest luminescence intensity is obtained when the sample is cubic with (100) crystal faces and the doping concentration of Li+ is 0.25 mol%. Additionally, multicolor emission (blue → aquamarine blue → green) was obtained from [CaY]F2:Ce3+/Tb3+ phosphors via adjusting the doping concentration of Tb3+, which resulted from the Ce3+ → Tb3+ energy transfer behavior; the energy transfer here happened through a dipole–dipole mechanism. This work may result in the as-synthesized phosphors having great application potential in many optoelectronic device fields, such as in displays and multicolor lighting.
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CRYSTAL RESEARCH AND TECHNOLOGY
·
2020
·Vol. 55
·期 8
·2000001
·
IF 1.169
Tingting Chen,Ke Li,Huibing Mao,Ye Chen,Jiqing Wang
The YVO 4 nanomaterials doped with the Yb 3+ /Tb 3+ /Eu 3+ ions and their mixture with the Au nanoparticles are synthetized with a classical sol-gel method. With the excitation of a 975 nm laser, both the doped YVO 4 sample and the corresponding mixture sample have a series of upconversion emission peaks of Eu 3+ and Tb 3+ , which includes the 5 D 0 → 7 F j transitions of the Eu 3+ ions and the 5 D 4 → 7 F j transitions of the Tb 3+ ions. The slope values of the log-log plots of laser power dependence for the upconversion emission intensities range from 1 to 2, which confirms that the upconversion process is a two-photon process. With the plasmon coupling, the slope value for the power dependence of the magnetic dipole transition 5 D 0 → 7 F 1 of the Eu 3+ ions decreases from 1.4 to 1.1, while it increases for other electric dipole transitions. Because of the plasmon coupling, the emission peak of the Eu 3+ at about 2.095 eV decreases significantly and almost cannot be observed. Meanwhile, the emission peak of the Tb 3+ at about 2.113 eV increases significantly and becomes the main emission peak in the yellow band. This phenomenon confirms that there is different mechanism for the magnetic and electric dipole emission with the plasmon coupling.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Yuexin Wang,Yanhua Song,Xiuqing Zhou,Keyan Zheng,Ye Sheng,Pingchuan Ma,Bowen Zhang,Meiqi Chang,Haifeng Zou
Uniform Lu 2 (C 4 H 4 O 6 ) 3 ·6H 2 O cauliflower-like microspheres have been synthesized via a direct precipitation method at room temperature, without any templates and catalysts. The solvent-dependent morphological evolution and the formation mechanism of the Lu 2 (C 4 H 4 O 6 ) 3 ·6H 2 O cauliflower-like microspheres were investigated in detail. Furthermore, Eu 3+ /Tb 3+ -doped Lu 2 O 3 inherited their parents' morphology were obtained through a direct annealing process. The Lu 2 (C 4 H 4 O 6 ) 3 ·6H 2 O:Eu 3+ , Lu 2 O 3 :Eu 3+ exhibit strong red emission corresponding to the 5 D 0 - 7 F j transition of the Eu 3+ ions. The Lu 2 (C 4 H 4 O 6 ) 3 ·6H 2 O:Tb 3+ , Lu 2 O 3 :Tb 3+ exhibit strong green emission corresponding to the 5 D 4 - 7 F j transition of the Tb 3+ ions under UV light excitation. The samples may have potential applications in the fields, such as light-emitting phosphors, advanced flat panel displays, or biological labeling.
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CHEMPHYSCHEM
·
2019
·Vol. 20
·期 6
·861-867
·
IF 3.077
Xiaojiao Kang,Wei Lü,Hongcheng Wang,Dongxiong Ling
A series of Ca 9 Ga(PO 4 ) 7 :Ce 3+ /Tb 3+ /Dy 3+ /Mn 2+ phosphors with tunable color, in which Ce 3+ acts as the sensitizer, was synthesized. Energy transfer (ET) from Ce 3+ to Tb 3+ /Dy 3+ /Mn 2+ was investigated in detail. Tb 3+ /Dy 3+ /Mn 2+ single-doped Ca 9 Ga(PO 4 ) 7 can exhibit green, yellow, and red emission, respectively. Incorporating Ce 3+ into a Tb 3+ /Dy 3+ /Mn 2+ single-doped Ca 9 Ga(PO 4 ) 7 phosphor can remarkably promote the luminous efficiency of the Tb 3+ /Dy 3+ /Mn 2+ ions. This enhancement originates from an efficient ET from Ce 3+ to Tb 3+ /Dy 3+ /Mn 2+ . The ET was validated by luminescence spectra, decay dynamics, and schematic energy levels. Moreover, the intensity ratio of red emission of Mn 2+ to violet emission of Ce 3+ was analyzed based on energy-transfer and lifetime measurements. In Ce 3+ -Tb 3+ , Ce 3+ -Dy 3+ , and Ce 3+ -Mn 2+ doped Ca 9 Ga(PO 4 ) 7 , the emitting color changed from violet to green, yellow, and red, respectively, which indicates the potential use of this new tunable phosphor in UV light-emitting diodes. Graphical Energy transfer from Ce 3+ to Tb 3+ /Dy 3+ /Mn 2+ in Ca 9 Ga(PO 4 ) 7 is investigated as a function of the Ce 3+ /Tb 3+ /Dy 3+ /Mn 2+ concentration and based on the photoluminescence emission/excitation spectra and decay curves. Through dual energy transfer, the emitting colors can change to green, yellow, and red from the initial blue color. The results suggest that the material is suitable for UV-white LEDs.
研究领域:
材料科学
·
发光材料
·
光学性质
·
固态化学
·
光子学
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Yuwei Guan,Yanhong Lu,Yun Wei
Cytochrome c (Cyt- c ) was commonly an intrinsic biomarker for a variety of cellular characteristics, such as respiration, energy levels, and apoptosis. Herein, a simple fluorescence sensor was constructed for the detection of Cyt- c in buffer and real serum samples. The carbon dots doped with Tb 3+ on the premise of 1-(2-pyridylazo)-2-naphthol (PAN) were fabricated and used as a dual-emission ratiometric fluorescent probe for detecting Cyt- c based on the internal filtering effect (IFE). As a fluorescent probe for ultra-sensitive detection, Cyt- c was quantitatively detected at different concentrations from 1 to 1000 nM. The fluorescent detection method for Cyt- c showed a good linear relationship from 1 to 50 nM, and the limit of detection (LOD) was 0.35 nM. In the recovery range of 101.27–103.39 % in human serum samples, the relative standard deviation (RSD) was less than 3.27 % (n = 3). In the end, the possible structures of CDs were predicted by DFT theoretical simulation calculations. All the results proved the ability of carbon dots as fluorescent probes to detect biomarkers and the application prospects in bioanalysis.
研究领域:
生物化学
·
分析化学
·
医学检测
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 37
·13304-13315
·
IF 4
Yuhong Zhang,Bo Sun,Jian Liu,Ziyi Zhang,Hang Liu
A series of Tb3+/Mn4+ co-doped double-perovskite oxides Sr2LuTaO6 (SLT) phosphors are synthesized by a solid-state method. The results of structural characterization prove that the Tb3+ and Mn4+ ions are successfully doped into the SLT host. The photoluminescence excitation (PLE) and photoluminescence (PL) spectra of Sr2LuTaO6:Tb3+, Sr2LuTaO6:Mn4+ and Sr2LuTaO6:Tb3+/Mn4+ are illustrated in detail. Under ultraviolet (UV) excitation, bright green and red lights are obtained from the Sr2LuTaO6:Tb3+/Mn4+ phosphor. In particular, the emission intensity of Tb3+ ions in Sr2LuTaO6:Tb3+/Mn4+ is enhanced by the energy transfer (ET) process from Mn4+ to Tb3+. The thermal enhancement of Tb3+ ion radiation in Sr2LuTaO6:Tb3+/Mn4+ also proves the ET process (Mn4+ → Tb3+). In addition, the thermal enhancement of Tb3+ ion radiation and the thermal quenching of Mn4+ ion radiation in the Sr2LuTaO6:Tb3+/Mn4+ system can be applied to develop optical thermometry based on luminescence intensity ratio (LIR) technology. Therefore, the LIRs of Mn4+ (2Eg → 4A2g) and Tb3+ (5D4 → 7F5,4) are investigated in the temperature range from 313 to 573 K. The absolute sensitivity (Sa) and relative sensitivity (Sr) of the Sr2LuTaO6:Tb3+/Mn4+ phosphor are calculated. The maximum values of Sa and Sr are obtained from the LIR of Tb3+: 5D4 → 7F4 (570–599 nm) and Mn4+: 2Eg → 4A2g (625–705 nm). The maximum Sa is 10.18% K−1 at 543 K, and the maximum value of Sr reaches 1.98% K−1 at 543 K. These results confirm that the ET process from Mn4+ to Tb3+ contributes to increasing the temperature measuring sensitivity of the Sr2LuTaO6:Tb3+/Mn4+ phosphor. Therefore, the Sr2LuTaO6:Mn4+/Tb3+ phosphor has prospective potential in optical thermometry and provides advantageous guidance for designing high-sensitivity optical thermometers.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 36
·12958-12967
·
IF 4
Jiejun Pan,Guang Xu,Sixue Ren,Tingjie Xu,Dongrui Li,Mengxin Liu,Xinan Shi,Daocheng Pan
Rare earth-doped metal oxide thin films exhibit remarkable potential for application in anti-counterfeiting, owing to their exceptional fluorescent properties. However, the existing fabrication techniques for these rare earth-doped luminescent thin films are predominantly complex and necessitate high-temperature conditions. In light of this issue, we present a low-temperature method for in situ fabrication of luminescent Ca1−xMoO4:Eux3+ and Sr1−xMoO4:Tbx3+ nanocrystal thin films by a solution deposition process. The developed method has the advantages of simple operation, rapid and low-temperature synthesis. The optimal chemical compositions of molybdate-based luminescent films are Ca0.90MoO4:Eu0.103+ and Sr0.90MoO4:Tb0.103+. Moreover, we evaluate the practical feasibility of luminescent nanoparticle films in the field of anti-counterfeiting by combining the unique fluorescent properties of rare earth ions and designing customized fluorescent patterns.
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INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Zhan Ni,Mengxin Liu,Bo Li,Xinan Shi,Qiulin Cao,Daocheng Pan
LaPO4:Ce3+, Tb3+ nanoparticles with a particle size of 2.7 nm are prepared by a facile room-temperature ligand-assisted coprecipitation method in an aqueous solution. Short-chain butyric acid and butylamine are used as binary ligands and play a critically important role in the synthesis of highly luminescent LaPO4:Ce3+, Tb3+ nanoparticles. The absolute photoluminescence quantum yield as high as 74% can be achieved for extremely small LaPO4:Ce3+, Tb3+ nanoparticles with an optimal composition of La0.4PO4:Ce0.13+, Tb0.53+, which is different from La0.4PO4:Ce0.453+, Tb0.153+ for bulk phosphor. The energy transfer from Ce3+ ions to Tb3+ ions is investigated in sub-3 nm LaPO4:Ce3+, Tb3+ nanoparticles, and Ce3+ ion emission is almost completely suppressed. This room-temperature, ultrafast, and aqueous-phase synthetic strategy is particularly suitable for the large-scale preparation of highly luminescent LaPO4:Ce3+, Tb3+ nanoparticles. LaPO4:Ce3+, Tb3+ nanoparticles (110 g) can be synthesized in one batch, which is perfectly suited to the needs of industrial production.
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Symmetry-Basel
·
2022
·Vol. 14
·期 11
·2293
·
IF 2.94
Fuchong Li,Wei Liu,Yang Gao,Li Tian,Junhong Guo,Jinfeng Cui,Baoping Yang
Organic fluorescent materials are widely applied in different important fields, such as light-emitting display, explosive detection, molecular imprinting, and so on, because of their low cost, easy functionalization, and large-scale fabrication. In this work, we designed and synthesized a new kind of organic fluorescent polysulfate composite material through post-sulfonation sulfur-fluorine exchange polymerization (a new kind of click chemistry) by symmetric molecular. Sulfur-fluorine exchange polymerization: symmetrical structure SO2F−R1−SO2F molecular reacted with symmetrical OH−R2−OH molecular through nucleophilic reaction in the presence of inorganic base. The polysulfate material was further modified by ClSO3H to get PSE−SO3H materials. Tb3+was highly dispersed on PSE−SO3H to afford organic-inorganic hybrid fluorescent materials through the conventional coordination chemistry method. The emission wavelength of the organic-inorganic hybrid fluorescent polymer PSE−SO3H−Tb3+was between 475 and 685 nm, the quantum yield reached 1.18%, and fluorescence lifetime lasted for 730.168 us, with the pure green light emission and long light-emitting lifetime. The fluorescence film was prepared through phase transformation method by the fluorescent polymer material PSE−SO3H−Tb3+. The film has the strong stability property in different pH conditions (pH 1~13). Thus, this kind of organic fluorescent polysulfate composite material may have certain prospects application in terms of detection and luminescence in extreme chemical environments in the future.Keywords:polysulfate material;rare earth matal;Tb3+;fluorescence;polymer;symmetric molecular;stepwise polymerization
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LUMINESCENCE
·
2021
·Vol. 37
·期 2
·348-356
·
IF 2.464
Shilin Shen,Zerong Long,Yi Lu,Jia Chen
A novel double-windows fluorescence sensor for carbofuran (CF) detection was successfully developed based on rare-earth Eu,Tb-doped Y 2 O 3 @SiO 2 -based molecularly imprinted nanoparticles (MINs) with a multilayer core-shell structure. The recognition process of the MINs for CF was fairly fast and needed only ~8 min to reach a dynamic equilibrium. Interestingly, one fluorescence attenuation window was found with an increase in CF concentration ( Q ) from 0.1 to 10 μg ml −1 and with a limit of detection (LOD) of 0.04 μg ml −1 at 544 nm belonging to the Tb 3+ emission, as well as another fluorescence enhanced window within the CF concentration range 10–100 μg ml −1 (LOD = 4 μg ml −1 ) at 617 nm of Eu 3+ emission in the dispersed rare-earth-doped MIN colloidal aqueous solution. Luminescence resonance energy transfer from CF to Eu 3+ and an inner filter effect of CF towards Tb 3+ , as well from the two independent detection windows were clearly observed simultaneously. The competition experiment displayed hardly any marked interference during detection of CF following addition of its analogues (carbaryl, isoprocarb, aldicarb, methomyl, and etofenprox). Moreover, the MINs could also be applied to accurately detect CF in rhubarb and wolfberry samples with recoveries of 85.7–92.2%. This sensing system has high specific recognition and a wide detection range for CF and provides new opportunities for pesticide detection.
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