Polymers
·
2018
·Vol. 10
·期 10
·1099
·
IF 2.935
Qiuping Li
Ionogels refer to an emerging composite material made from the confinement of ionic liquids within some specific cross-linked network matrices. They have potential applications in areas such as electrochemical and optical-electric materials. Incorporation of lanthanide (Eu3+, Tb3+) complexes covalently functionalized multi-walled carbon nanotubes (MWCNTs) in ionogels provide new ideas to design and synthesize novel luminescent hybrid materials that have excellent characteristics of luminescence and ionic conductivity. Here, the multifunctional ionogels were synthesized by confining an ionic liquid and the rare earth functionalized MWCNTs in the cross-linked polymethyl methacrylate (PMMA) networks, resulting in a novel optical/electric multifunctional hybrid material. The SEM images and digital photographs suggest that the lanthanide functionalized MWCNTs are evenly dispersed in the hybrid matrices, thus leading to a certain transparency bulky gel. The resulting ionogels exhibit certain viscosity and flexibility, and display an intense red/green emission under UV-light irradiation. The intrinsic conductibility of the embedded ionic liquids and carbon nanotubes in conjunction with the outstanding photoluminescent properties of lanthanide complexes makes the soft hybrid gels a material with great potential and valuable application in the field of optical-electric materials.Keywords:lanthanide complex;ionic liquid;carbon nanotube;ionogel;composite materials;luminescence
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Li Lv,Junzhong Wang,Wei Wang,Limin Han
In this paper, Y 3+ ions doped CaMoO 4 :Eu 3+ with controlled microstructures were prepared via a hydrothermal method . All samples were fully characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), UV–vis diffuse reflectance spectroscopy, and photoluminescence measurement. The luminescent performance improvement aroused by doping was systematically investigated after inducing Y 3+ as co-doping ions in CaMoO 4 :Eu 3+ lattice. It is found that the lattice of Y 3+ doped CaMoO 4 :Eu 3+ nanocrystals contracted with increasing the Y 3+ concentration, resulting in a red shift of 1 A 1 → 1 T 1 transition from the valence band to the conduction band. Meanwhile, excitation band at 300 nm corresponding to the typical 1 A 1 → 1 T 1 transition also shifted to lower energy, originating from the charge-transfer between MoO 4 2− group and Eu 3+ ions. When the Y 3+ doping concentration was less than 0.05, the quantum efficiency of Y 3+ doped CaMoO 4 :Eu 3+ nanocrystals was all superior to pure CaMoO 4 :Eu 3+ nanocrystals, which can be assigned to the lattice structure contraction, co-doping effect, doping concentration variation. However, as the content of Y 3+ ions further increasing, Y 3+ ion should act as a luminescence killer, and therefore resulting in a nonradiative de-excitation.
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Nanoscale
·
2015
·Vol. 7
·期 34
·14248-14253
·
IF 7.394
Weidong Han,Bin Ding,Mira Park,Fuhai Cui,Zafar Khan Ghouri,Prem Singh Saud,Hak-Yong Kim
Novel luminescent and amorphous La2O3–ZrO2:Eu3+ (LZE) nanofibrous membranes with robust softness are fabricated for the first time via a facile electrospinning technique. By incorporating zirconium oxide, the as-prepared lanthanum oxide nanofibrous membranes can be dramatically changed from extreme fragility to robust softness. Meanwhile, the softness and luminescent performance of LZE nanofibrous membranes can be finely controlled by regulating the doping concentration of zirconium oxide and europium in lanthanum oxide nanofibers. Additionally, the crystal structure analysis using X-ray diffractometer and high resolution transmission electron microscopy measurements have confirmed the correlation between the amorphous structure and softness. Furthermore, LZE membranes show the characteristic emission of Eu3+ corresponding to 5D0, 1, 2–7F0, 1, 2, 3, 4 transitions due to an efficient energy transfer from O2− to Eu3+. The LZE nanofibrous membranes with the optimum doping Eu3+ concentration of 3 mol% exhibit excellent softness and luminescent properties, which make the materials to have potential applications in fluorescent lamps and field emission displays.
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Journal of Physical Chemistry C
·
2014
·
IF 4.835
Bing Chen,Xvsheng Qiao,Dengfeng Peng,Xianping Fan
In this study, hexagonal-phase NaY0.6–xCe0.1Gd0.3EuxF4 nanorods were synthesized via a mild solvothermal method. By modifying the Eu3+ dopant concentration, the crystal phase, morphology, and luminescent properties were well controlled. A broad excitation band centered at around 260 nm corresponding to the 2F5/2 → 4f-5d transition of Ce3+ was detected in the hosts containing Gd3+ ions by monitoring the Eu3+ emissions, indicating that an efficient Ce3+ → Eu3+ energy transfer occurred via the Gd3+ sublattice. Luminescence decay behaviors of the NaY0.6–xCe0.1Gd0.3EuxF4 nanorods were studied, and the energy transfer mechanism was discussed. An obvious rising edge on the luminescence decay curve of Eu3+ ions in the NaY0.6–xCe0.1Gd0.3EuxF4 nanorods was observed. The rising time is proposed to describe the energy migration time from Ce3+ to Eu3+ via the Gd3+ sublattice.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Rui Li,Xiaoyi Wu,Yeqing Chen,Qingguang Zeng,Tingting Deng,Ting Yu
In recent years, the pursuit of luminescent thermometer probes with low cost and high sensitivity has become a significant research challenge. This work proposes a strategy that employs lanthanide ions and carbon dots with dual-emission with diverse temperature dependencies to achieve high-temperature sensitivity. Specifically, the fabrication of dual-activated temperature probes has been achieved using NaMgF3:Eu3+/carbon dot nanocomposites through a simple coprecipitation process at room temperature. The optical temperature sensor, NaMgF3:Eu3+/carbon dot, was developed using Eu3+ emission as an internal standard and carbon dot as the temperature signal. The sensor exhibits a substantial absolute sensitivity of 8.3 ± 0.2%K–1 and a relative sensitivity of 2.0 ± 0.1%K–1, both at 300 K, making it a promising candidate for physiological thermometry. Within the temperature range of 300–440 K, the NaMgF3:Eu3+/carbon dot probe shows a relative sensitivity of better than 1.0%K–1 with good excellent repeatability as well as a nearly linear relationship between the Commission Internationale de l’Echlairage chromaticity coordinates of the observed fluorescent color change. The feasibility of the proposed strategy has also been verified by modifying lanthanide ions, e.g., Tb3+. It is anticipated that this pilot study will serve as a springboard for research on dual-mode nanothermometers with superior ratiometric and colorimetric performance.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
·
IF 4.3
Xin Yuan Li,Qing Hong Long,Zhoujian Pan,Xiao Han Ma,Chunhua Xia,Xi Mai,Na Li
Developing rapid tetracycline sensing system is of great significance to monitor the illegal addition to drugs and pollution to food and ecosystem. By loading covalent organic frameworks (COFs) with Eu 3+ , a new hybridized material (COF@Eu 3+ ) was prepared for tetracycline determination. Based on the Schiff base reaction, the COFs were by synthesized through solvent evaporation in 30 min at room temperature. Thereafter, Eu 3+ was modified into COFs to develop the COF@Eu 3+ sensing platform by adsorption and coordination. In presence of tetracycline, tetracycline can displace water molecules and coordinate with Eu 3+ through the antenna effect. As a result, the red fluorescence of Eu 3+ was enhanced by tetracycline with green fluorescence of COF as a reference. The developed ratiometric fluorescence sensor exhibits a linear range of 0.1–20 μM for detecting tetracycline with a detection limit of 30 nM. Integrated with a smartphone, the rapid tetracycline detection can be realized in situ, which is potential for high-throughput screening of tetracycline contaminated samples. Furthermore, the COF@Eu 3+ fluorescence sensor has been successfully applied to the detection of tetracycline in traditional Chinese medicine compound preparation with satisfied recoveries. Therefore, a smartphone-assisted device was successfully developed based on Eu 3+ -functionalized COF, which is an attractive candidate for further applications of fluorescence sensing and visual detection.
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PHYSICA SCRIPTA
·
2025
·Vol. 100
·期 3
·035514
·
IF 2.6
Ruiliang Zuo,Zehua Zhang,Jingheng Liang,Zhenzhen Jiang,Lili Wang,Zian Cheak Tiu
In this study, we synthesized Y2Zr2O7 (YZO): Bi3+/Eu3+ microcrystals through high-temperature solid-phase method. When the microcrystals were excited upon 263 nm and 329 nm, a tunable emission color variation from red to white is observed. The Correlated Color Temperature (CCT) of YZO: 6% mol Bi3+, 5% mol Eu3+ excited upon 329 nm is 4194 K, exhibited warm white light. Furthermore, the emission intensity of Eu3+ ion is remarkably improved by the incorporation of Bi3+ ion, due to the energy transfer from Bi3+ ion to Eu3+ ion. Their efficiency (ηT) in YZO: 6% mol Bi3+, 5% mol Eu3+ reaches 49.17%. The corresponding absolute quantum efficiency (λex = 329 nm) of YZO: 6% mol Bi3+, 5% mol Eu3+ is 56.21%. These results indicate that YZO: Bi3+/Eu3+ microcrystals are highly potential to enhance the industrial growth of photonics field, particularly the application of anti-counterfeiting and white light-emitting diodes.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Adnan Khan,Xu Sang,Jiaxin Yang,Muhammad Ikram,Li Yang,Sadia Rehman,Rui Xu,Feng Song,Ming Feng
This study presents the synthesis and characterization of upconverter nanostructures consisting of a perovskite host matrix, CaZrO 3 , co-doped with trivalent ytterbium (Yb 3+ ) and europium (Eu 3+ ), denoted as CaZrO 3 :Yb 3+ /Eu 3+ . Single-doped CaZrO 3 :Eu 3+ samples were excited using a 394 nm UV source, while CaZrO 3 :Yb 3+ /Eu 3+ samples were excited with a 980 nm diode laser source. Yb 3+ ions efficiently absorb the 980 nm light and transfer the absorbed energy to the nearby ion Eu 3+ ions, leading to the emission of visible light around 590, 614, and 655 nm, respectively. The emission spectra of Eu 3+ ions exhibit an initial increase with increasing Yb 3+ concentration, peaking at 7 mol%, followed by a decrease due to luminescence quenching. The decay lifetime of Eu 3+ ions under 300 nm excitation decreases simultaneously with increasing Yb 3+ concentration, indicating energy migration between Yb 3+ and Eu 3+ . Detailed explanations of the energy transfer mechanism between Yb 3+ and Eu 3+ ions are provided, supported by equations and diagrams. This study provides valuable insights into the optimization of dopant concentrations for enhancing upconversion luminescence in CaZrO 3 :Yb 3+ /Eu 3+ nanostructures, with 3 mol% Eu 3+ concentration identified as optimal based on preliminary experiments. The findings presented in this paper contribute to the understanding of energy transfer processes in luminescence upconversion materials and highlight the potential of CaZrO 3 :Yb 3+ /Eu 3+ nanostructures for applications in lighting, displays, and bio-imaging. This work represents a significant advancement in the field of upconversion luminescence emission, particularly in the utilization of CaZrO 3 codoped with Yb 3+ and Eu 3+ , and lays the foundation for further research in this area.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Zengkun Li,Rui Xu,Wenfei Shen,Yao Wang,Zhongjie Cheng,Yulin Niu,Jun Li,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
Dynamic control of fluorescence to meet the evolving demands of optoelectronic devices is garnering significant attention. Current strategies primarily focus on altering the chemical environment of the luminescent centers using external substances, such as quenchers, without considering modifications to the fluorescent groups themselves for luminescence control. In this work, we investigate a novel electro-quenching device that incorporates europium (Eu 3+ ) complexes into a polyethylene oxide (PEO) matrix. The Eu 3+ complexes, consisting of the central ion Eu 3+ and organic conjugate molecules, can be induced into a polarized state within the PEO matrix under an applied electric field, causing a relative displacement between the Eu 3+ ions and the organic ligands. This displacement disrupts the ligand-mediated sensitization process, leading to a reduction in fluorescence intensity, a phenomenon we term polarization quenching. Notably, upon the removal of the electric field, the relative displacement between Eu 3+ and the ligands is reversed due to depolarization, enabling the device to autonomously recover its sensitized luminescence. The process exhibits a repetitive nature. This study presents an innovative method for the dynamic regulation of fluorescence through the migration of Eu 3+ luminescent centers, highlighting substantial potential for the modulation of light emission from lanthanide metal complexes via external fields. Specifically, the visualization and retrieval of optical information can be achieved through the application and subsequent removal of an external electric field, thereby facilitating its utilization in prospective photoelectric data storage media.
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DYES AND PIGMENTS
·
2017
·
IF 3.473
Renping Cao,Changlin Liao,Fen Xiao,Guotai Zheng,Wen Hu,Yimin Guo,Yuanxiu Ye
A series of LiLaMo 2 O 8 :Eu 3+ , R (R = Bi 3+ and Sm 3+ ) phosphors are synthesized by a high temperature solid-state reaction method in air. The crystal structures, fluorescence lifetimes , and luminescence properties are investigated in detail. LiLaMo 2 O 8 :Eu 3+ phosphor with excitation 395 nm shows red light in the range of 525–725 nm and it photoluminescence intensity may be enhanced ∼2.35 times due to energy transfer (ET) from a sensitizing species (Bi 3+ or Sm 3+ ) to Eu 3+ ion after Bi 3+ or Sm 3+ ion is co-doped. The optimal Eu 3+ , Bi 3+ , and Sm 3+ ion concentrations are 4%. Luminous mechanism of LiLaMo 2 O 8 :Eu 3+ , R (R = Bi 3+ and Sm 3+ ) phosphors and ET processes between Eu 3+ and Bi 3+ /Sm 3+ ions are analyzed and explained by their excitation and emission spectra and energy level diagrams of Eu 3+ , Bi 3+ , and Sm 3+ ions. The experimental results indicate that LiLaMo 2 O 8 :Eu 3+ , R (R = Bi 3+ and Sm 3+ ) phosphors may be used as potenial red emitting materials for white light emitting diodes (LEDs) based on either a near ultraviolet (∼395 nm) or blue (∼465 nm) chip.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Shree Krishna Tamang,Govinda Gurung,Raj Kumar Parajuli,Bi Yupeng,Kumar Neupane,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
Pollution of water with antibiotics is a very serious global issue. So, simple, fast, and ecofriendly detection of such pollutants in aqueous environments has aroused great attention. Several intriguing properties such as narrow emission band, large stokes shift, long luminescence decay time and resistance to photobleaching distinguishes europium-based materials from commonly used fluorophores in biology as a superior optical smart material for applications in diverse fields. Herein, strongly luminescent Eu 3+ -induced polyelectrolyte nanoaggregates (EINAP) were synthesized and successfully characterized. The biocompatible polysaccharides hyaluronic acid and chitosan are used to disperse organic europium complexes resulting in formation of hybrid nanoaggregates. As synthesized EINAP demonstrated excellent quantum yield (89.29 %) and luminescence lifetime (656 µs). The EINAP also have high sensitivity and low limit of detection with good analytical precision for nitrofuran antibiotics in aqueous environments. The luminescent nano sensor developed in this work could be a novel tool for assessment of antibiotic pollution in the environment. The overall sensing mechanisms for detection of nitrofurans in aqueous environments were found to be the combination of inner filter effect and photoinduced electron transfer respectively.
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POLYHEDRON
·
2025
·
IF 2.6
Qian Du,Chang-Sheng Wang,Yu-Guo Yang,Wei Zhao,Xiao-Na Shen,Bing Liu,Yuan-Yuan Zhang,Hua-Di Zhang,Hua-Jian Yu,Cheng-Cheng Qiu,Xian-Shun Lv,Rui Zhang,Xu-Ping Wang
Some Tb 3+ /Eu 3+ doped SrGdGa 3 O 7 (SGGO) phosphors were fabricated, achieving multi-color tunability through the addition of a sensitizer. The experimental results indicate that the doped ions are uniformly distributed, with no impurity phases detected. In SGGO-based phosphors, Eu 3+ ions serve as activators and exhibit an optimal luminescence transition level of 5 D 0 → 7 F 4 . When Tb 3+ ions are used as the sensitizer and at a specific concentration, the luminescence color transition of green → orange → red as the content of Eu 3+ enhances. Analysis of the decay lifetime curves reveals that Tb 3+ → Eu 3+ energy transfers occur in the co-doped SGGO phosphors, with the mechanism identified as quadrupole–quadrupole interaction. This article investigates the specific energy transfer processes involved. The optimum content of Eu 3+ is ascertained as 0.03. Under the excitation at 375 nm, the SGGO based phosphor containing 0.06 Tb 3+ and 0.03 Eu 3+ exhibits CIE coordinates of (0.5000, 0.4397).
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