查找使用阿拉丁产品的科研文献

Molten salt synthesis and luminescent properties of YVO4:Eu nanocrystalline phosphors

Fang WANG,Chenglu LIU,Zhiqiang ZHOU,Peiyun JIA,Jun LIN

YVO 4 :Eu nanocrystalline phosphors were successfully prepared at 400 °C in equal moles of NaNO 3 and KNO 3 molten salts. NaOH concentration and annealing temperature played important roles in phase purity and crystallinity of the nanocrystallines, and the optimum NaOH concentration and annealing temperature were 6:40 and 400 °C, respectively. The nanocrystallines were well crystallized with a cubic morphology in an average grain size of 18 nm. Upon excitation of the vanadate groups at 314 nm, YVO 4 :Eu nanocrystallines exhibited the characteristic emission of Eu 3+ , which indicated that there was an energy transfer from vanadate groups to Eu 3+ . Moreover, the influence of superficial effect, especially the dangling bonds on the structure and luminescent properties of the nanocrystallines was discussed in detail.

Sensitive and Anti-Interference Al3+ Sensing with a Luminescent Eu-MOF

Shu-Yan Wei,Jia Chen,Shen-Yin Hou,Bo Sun,Jing Ren,Xin-Hui Wang,Lei Geng,Zhi-Ming Zhang,Hua-Qing Yin

A luminescent lanthanide metal–organic framework, [(TD)5Eu4(HCO2)2(DMF)4] (Eu-TD, TD/H2BTDB = 4,4′-(benzo[c][1,2,5] thiadiazole-4,7-diyl)dibenzoic acid), was synthesized via a solvothermal method by coordinating Eu3+ ions with the strongly emissive ligand H2BTDB. Single-crystal X-ray diffraction analysis reveals that the Eu-TD is in the hexagonal system with space group P6422. Eu-TD demonstrated exceptional selectivity toward Al3+ ions, exhibiting remarkable sensitivity with a low detection limit (limit of detection (LOD) = 0.04 μM) and excellent anti-interference properties. Eu-TD exhibits a pronounced Al3+-triggered luminescent turn-on response across varied aqueous environments, underscoring its viability for environmental monitoring applications. The selective Al3+ recognition in Eu-TD originates from Lewis basic N sites that strongly coordinate with Al3+ through acid–base interactions, concurrently enhancing the absorbance and amplifying the luminescence.

Promotion on Formaldehyde Sensing of 3D Porous SnO2 by Eu Doping

Chunxia Tian,Haiying Li,Xi-Ang Tian,Li Liu

Blue-light-excitable Y2W3O12:Eu phosphor enabling efficient high-temperature photothermal feedback

Defu Xu

A blue-light-excitable Y 2 W 3 O 12 :Eu FIR thermometer is developed using 466 nm excitation matched to commercial InGaN LEDs. • The negative thermal expansion effect endows the phosphor with excellent resistance to thermal quenching, retaining ∼40% of its emission at 603 K. • The thermometer achieves a maximum relative sensitivity of 0.15% K −1 , repeatability >99.3%, and low temperature uncertainty below 4.2 K from 363 to 603 K. The development of reliable and cost-effective fluorescence intensity ratio (FIR) thermometers for high-temperature environments is urgently required, yet most existing probes rely on near-infrared stimulated upconversion or ultraviolet excited downshifting, which suffer from high system complexity, optical damage, and high cost. In response to this dilemma, herein I report a blue-light-excitable FIR thermometer based on Eu 3+ -doped Y 2 W 3 O 12 (YWO) negative thermal expansion (NTE) phosphor. Under 466 nm blue excitation, the YWO:Eu phosphor exhibits efficient downshifting luminescence dominated by the 5 D 0 → 7 F 2 electric dipole transition at 612 nm, and the NTE effect endows the phosphor with excellent resistance to thermal quenching. The proposed thermometer achieves a maximum relative sensitivity of 0.15% K −1 , together with excellent repeatability (>99.3%) and low temperature uncertainty (<4.2 K) over the 363-603 K range. Also, the single-wavelength excitation strategy allows the use of a commercial blue light emitting diode (LED), eliminating the need for costly tunable lasers or dual-wavelength setups and thereby reducing system complexity and cost. These results demonstrate that the blue-light-excited YWO:Eu FIR thermometer is a promising candidate for non-contact photothermal feedback in high-temperature environments.

Highly sensitive temperature probe fabricated by high aspect ratio Eu-BTC nanowire

Jiannan Sun,Aizhao Pan,Ke Yan,Pan Zhang,Yinghao Chen,Wei Xiong,Xuehang Chen,Jun Hong

Metal-organic frameworks (MOFs) have shown great potential as a new platform for developing solid-state light-emitting temperature probes . Herein, we synthesized Eu-BTC (MOFs) with controllable nanowire and nanorod morphologies by changing solvents. Eu-BTC Nanowire was produced from DMF with a size of 15 µm and a 21.5 % photoluminescence quantum yield (PLQY), while the nanorods from H 2 O yielded with a size of 200 nm (PLQY=17.4 %). The Eu-BTC materials exhibited highly variable temperature properties depending on the morphology. Eu-BTC Nanowire from DMF presented better temperature dependence as a highly sensitive temperature probe owing to its higher linearity and more excellent temperature-dependent reversibility , which further demonstrated its potential for application as a temperature probe. While, the Eu-BTC nanorod from H 2 O showed a non-linear relationship with temperature and low temperature-dependent reversibility , making it unsuitable as a temperature probe. The morphologies-dependent luminescence sensing mechanism of Eu-BTCs and the heat conduction induced by surface defects mechanism were proposed. This work provides theoretical guidance for developing highly sensitive and non-contact temperature probes , especially for the morphology-dependent temperature probes.

Eu-based anolytes for high-voltage and long-lifetime aqueous flow batteries

Pan Sun,Yahua Liu,Peipei Zuo,Yuanyuan Li,Qianru Chen,Zhengjin Yang,Tongwen Xu

Aqueous flow batteries (AFBs) are among the most promising electrochemical energy storage solutions for the massive-scale adoption of renewable electricity because of decoupled energy and power, design flexibility, improved safety and low cost. The development of high-voltage AFB is, however, limited by the lack of stable anolytes that have low redox potential. Here we report Eu-based anolytes for high-voltage pH-neutral AFB applications. Eu 3+ has a reduction potential of −0.39 V vs. SHE, which can be dramatically lowered when forming stable complex with inexpensive organic chelates. A typical complex, EuDTPA, features a low redox potential of −1.09 V vs. SHE, fast redox kinetics, and a high water solubility of 1.5 M. When paired with ferrocyanide, the battery had an open-circuit voltage of 1.56 V and demonstrated stable cell cycling performance, including a capacity retention rate of 99.997% per cycle over 500 cycles at 40 mA cm −2 , a current efficiency of >99.9%, and an energy efficiency of >83.3%. A high concentration anolyte at 1.5 M exhibited a volumetric capacity of 40.2   Ah L −1 , which is one of the highest known for pH-neutral AFBs, promising a potent solution for the grid-scale storage of renewable electricity.

Eu-MOF based fluorescence probe for ratiometric and visualization detection of Cu2+

Zhihua Li,Lin Chen,Jiaxi Deng,Jing Zhang,Cailin Qiao,Mei Yang,Guoren Xu,Xiaogang Luo,Danqun Huo,Changjun Hou

Water contamination caused by heavy metals represents an urgent global issue. Cu 2+ , a potential trace heavy metal pollutant, can accumulate in the human body through the food chain, leading to excessive levels that give rise to diverse health complications. Hence, in this investigation, a novel and efficacious fluorescent probe named Eu-BTB was developed for the detection of Cu 2+ , employing 1,3,5-triphenyl(4-carboxyphenyl) (H 3 BTB) as the ligand and Eu 3+ as the metallic framework. The probe demonstrates exceptional fluorescence characteristics. The interaction between the probe ligand BTB and Eu 3+ triggers an antenna effect, heightening the emission efficiency of Eu 3+ while preserving its intrinsic emission. The introduction of Cu 2+ competes with BTB for binding, thus quelling the antenna effect and inducing a fluorescence alteration. Within the concentration range of 0.05–10 μM, the fluorescence intensity-to-Cu 2+ concentration ratio exhibits a robust linear correlation, with a remarkably low detection limit of 10 nM and a rapid response time of 3 min. The fluorescent probe has been effectively deployed for the detection of copper ions in water across diverse environmental conditions, with the obtained outcomes being validated via the conventional approach of inductively coupled plasma mass spectrometry (ICP-MS). The Eu-BTB probe showcases the advantages of simplicity, swiftness, and broad applicability, thus affirming its potential for the prompt and accurate detection of Cu 2+ in diverse environmental water samples.

Preparation and characterization of Eu/ PVP/TPPO/PAN fluorescent film for LED

Zhihao Zhang,Md All Amin Newton,Xue Yang,Binjie Xin

In this study, a novel red fluorescent materials were prepared by incorporating Eu/PVP/TPPO complexes into PAN substrates. An Eu/PVP/TPPO complex was synthesized by introducing polyvinylpyrrolidone (PVP) into a mixture of europium (Eu) and triphenylphosphine oxide (TPPO). Using a spin-coating technique, highly efficient and thermally stable Eu/PVP/TPPO/polyacrylonitrile (PAN) fluorescent films were prepared. The molecular interactions , surface morphology , functional groups, and elements of the Eu/PVP/TPPO/PAN fluorescent films were characterized by FT-IR, SEM, UV–Vis, and EDS analysis. The thermal stability, fluorescent properties, and chromaticity of the films were also systematically investigated. The results showed that the Eu/PVP/TPPO complex could disperse uniformly in the substrate, and the fluorescent films could emit homogeneous red light. Furthermore, the Eu/PVP/TPPO/PAN fluorescent films had a strong synergistic effect, which increased the fluorescence intensity and produced a purer red light. Based on these findings, a new type of redlight LED device was fabricated by one-step method. Due to its outstanding properties, this film has great potential in the next generation of lighting and display applications.

MIP-coated Eu(BTC) for the fluorometric determination of lincomycin in eggs

Pu Wu,Qiuzheng Du,Yiyang Sun,Zhonghong Li,Hua He

Lincomycin (LCM) has low ultraviolet (UV) absorption and thus, its determination requires complex instrumentation. Herein, a novel fluorometric probe based on an europium metal–organic framework coated with molecularly imprinted polymers (Eu(BTC)-MIP) was fabricated for the selective determination of LCM. First, highly luminescent Eu(BTC) was synthesized at room temperature. Then, through a simple co-polymerization process, MIPs were formed on the Eu(BTC) surface in the presence of LCM as template molecules to obtain Eu(BTC)-MIP. Eu(BTC) acted as a supporting substrate and antenna, and the MIP layer provided specific binding sites for LCM. Due to the advantages of both Eu(BTC) and MIPs, the probe had a long emission lifetime, strong fluorescence and specific recognition. Under the optimized conditions, the probe achieved the selective determination of LCM in the concentration range of 10 to 100 μg L−1 with a detection limit (LOD) of 7.18 μg L−1 (S/N = 3). This method is attractive because of its low cost, good selectivity, ready availability and simple manipulation without the need for complex instrumentation. Furthermore, the probe was successfully employed to detect LCM in egg samples with a recovery in the range of 88.02% to 97.29% and a relative standard deviation (RSD) of less than 3.46%. The satisfactory results demonstrate that the proposed probe based on Eu(BTC)-MIP can be used for the quantitative analysis of LCM and exhibits great potential for LCM determination in food samples. Also this study provides a new perspective for the determination of weak ultraviolet absorption or non-fluorescent substances without conjugated groups.

Highly stabile ZnGa2O4:Eu nanocrystals as a fluorescence probe for bio-imaging

Caiyan Yu,Dong Yan,Sunqi Lou,Chao Xia,Mengmeng Cao,Tongtong Xuan,Jing Wang,Huili Li

Acetylacetonate (acac) passivated and europium incorporated ZnGa 2 O 4 nanocrystals (ZGO:Eu NCs) were successfully prepared via a facile one-step non-injection process in oleylamine at a relatively low reaction temperature of 300 °C under N 2 ambient. The resultant ZGO:Eu NCs exhibited a well-dispersed morphology with an average particle size of 4 nm. The enhanced and broad absorption band from 250 to 450 nm is attributed to the synergistic effect between the acac as an antenna and the coexistence of Eu 3+ and Eu 2+ . Under 405 nm excitation, a full spectrum emission covering from 400 to 720 nm was observed. The sharp red emission coming from Eu(III) 5 D 0 → 7 F J (J = 1–4) transitions can be enhanced by adjusting Eu concentrations and reaches the optimum at 20 at% Eu. Subsequently, the as-prepared NCs were transferred into an aqueous media via a ligand exchange by polyethyleneimine (PEI) to obtain the hydrophilic ZGO:Eu@PEI NCs. The initial fluorescent properties are preserved well. Finally, the strong red fluorescence emission , suitable excitation window, high photo-stability, excellent water solubility, and prominent bio-compatibility make ZGO:Eu@PEI NCs as high quality bio-imaging probes successfully identify living KB cells. The method mentioned in this paper overcomes the bottle-neck of the inorganic bulk phosphors as probes in bio-imaging, and as a result, expands their applications in optical detection and medical diagnosis fields.

A self-calibrated luminescent thermometer based on nanodiamond-Eu/Tb hybrid materials

Xue-Ying Wu,Qi Zhao,Dong-Xue Zhang,Ya-Chuan Liang,Kui-Kui Zhang,Qian Liu,Lin Dong,Chong-Xin Shan

Luminescent hybrid materials based on nanodiamonds (NDs) and rare earth ions have been successfully synthesized by covalently modifying NDs with pyromellitic acid (PMA) which is capable of coordinating to Eu3+ and Tb3+ ions. With NDs acting as a host matrix, the PMA and rare earth ions serve as an organic sensitizer and activator, respectively, yielding a highly bright hybrid composite. Interestingly, for the co-doped hybrid composites ND-PMA-Eu/Tb, the intensity ratio of the two emissions, 5D4 → 7F5 transition (Tb3+) to 5D0 → 7F2 transition (Eu3+), is linearly related to temperature in the range from 77 K to 277 K. Therefore, the hybrid could be developed as a self-calibrated ratiometric luminescent thermometer due to its temperature-dependent luminescence performance.

Achieving color-tunable luminescence in CaF2:Eu phosphors for multimode anti-counterfeiting

Linglu Kuang,Feng Zhang,Jian Zhang,Xiaodie Zhu,Xu Tian,Jianxiong Shao,Yichun Liu,Xuhui Xu,Zhichao Liu

Optical materials are widely used in the information coding, display, and anti-counterfeiting fields due to their tunable color. However, the regulation of the color change in a material is mainly achieved by co-doping with different ions to achieve multimode luminescence, which greatly increases the difficulty of material synthesis. Herein, CaF2:Eu with different doping amounts of Eu ions as an anti-counterfeiting material is synthesized in one step by a simple high-temperature solid-state method. The concentration of Eu can adjust the reduction ratio of Eu ions and give the material multicolor emission. Moreover, X-ray-induced ion reduction achieves the multicolor emission of Eu2+ and Eu3+ ions in a single matrix of CaF2:Eu. This achieves radio-photo luminescence (RPL). In addition, the mechano-luminescence (ML) of CaF2: 0.5%Eu has also been confirmed. These findings provide unique insights into the design of highly integrated advanced anti-counterfeiting technologies using multi-stimuli-responsive luminescent materials.