JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Jing Zhang,Bo Ye,Rong-Rong Wang,Xiao-Ma Tao,Ge-Mei Cai
The luminescence behavior of rare earth Eu as the famous fluorescent probe not only depends on its chemical valence, but also on the concentration and occupation in the lattice, except for the interaction with the host. Herein, previously reported monoclinic BaIn 2 (P 2 O 7 ) 2 (BIP) phosphate acts as the host, and part of In atoms have been experimentally designed to be replaced by Eu. The lattice occupation and luminescence behavior of Eu in BIP were discussed. In the PL spectra , the intrinsic emission of BIP and the emission of Eu 2+ were observed in addition to the characteristic emission of Eu 3+ , all of which were also emerged in the cathodoluminescence spectrum. EPR analysis confirmed the existence of Eu 2+ , that is, Eu 3+ is spontaneously reduced in the BIP lattice. The red/orange ratio of Eu 3+ characteristic emission changes with the change of concentration, indicating the evolution of lattice occupation. The charge density before and after Eu doped BIP was analyzed by DFT calculation. From the perspective of charge exchange, it was further confirmed that partially Eu 3+ was reduced to Eu 2+ at different In or Ba crystallographic sites. The present work demonstrates a unique case of mixed occupation, double valence and tunable emission of Eu in phosphate.
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Analytical Methods
·
2023
·
IF 3.1
Xin-Xin Dong,Tao-Li Chen,Xiangjuan Kong,Shuang Wu,Fang-Fang Kong,Qiang Xiao
In this work, a facile fluorescence Eu3+-based metal organic frameworks (Eu MOF) sensor for ascorbic acid (AA) and ascorbate oxidase (AAO) detection was developed. The fluorescence of Eu MOF could be effectively quenched by Ce3+ but not Ce4+ at an appropriate concentration, thus, when the reductant AA was added into the solution containing Ce4+, Ce4+ was chemically reduced to Ce3+, which induced the decreased fluorescence signal of Eu MOF. However, when AAO was introduced, AA was effectively oxidized to dehydroascorbic acid (DHAA) under the catalysis of AAO, thus, Ce4+ could not be reduced, resulting in the fluorescence restore of Eu MOF. Hence, the concentration of AA and AAO could be determined by the fluorescence decrease and restore of Eu MOF. The fluorescent platform showed high sensitivity with the limit of detection of 0.32 µM for AA and 1.18 U/L for AAO, respectively. Moreover, the proposed method was successfully applied for AA and AAO determination in real samples, indicating great potential for biomedical application in complex matrices.
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ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Kang Zhang,Meng-Jiao Zhu,Yi-Wen Zhou,Xiao Liu,Feng Chen,Yu-Yang Zhou,Wan-Fei Li,Sheng Liu,Yun Jiang,Shou-Qing Liu
Latent fingerprint (LFP) powders are crucial in the detection of LFPs in forensic science. However, it is often plagued by poor image resolution and low contrast. Herein, enhanced LFP fluorescence (FL) visualizations are achieved by doping Eu(III) coordination compound Eu(TTA) 3 phen directly into SiO 2 microspheres instead of Eu(III) ions. Using the synthesized Eu(TTA) 3 phen-SiO 2 microspheres , the fine characteristic structure of LFP can be seen and recognized under 365 nm irradiation, up to Level 3. However, the Eu 3+ -SiO 2 microspheres were difficult to recognize the Level 2,3 fingerprint structure. The difference between the ridge and furrow gray values of Eu(TTA) 3 phen-SiO 2 microspheres is 2.1 times that of Eu 3+ -SiO 2 microspheres. The coordination effect increased the asymmetry around Eu(III) ions, resulting in the ultrasensitive 5 D 0 → 7 F 2 transition, thus increasing the FL intensity , and the uniform doping of the Eu(III) coordination compound into SiO 2 also reduced the surface FL quenching due to shielding from oxygen. Under this dual effect, the LFP performance of Eu(TTA) 3 phen-SiO 2 microspheres has been significantly improved. We believe that this novel and easy LFP visualization method is a promising routine in specific target detection including criminal investigation, customhouse check-in, and drug control.
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JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yuxuan Luo,Danyu Zhang,Shujun Xu,Lianjie Li,Liping Chen,Hai Guo
Herein, YNbO 4 (YNO):Bi 3+ ,Ln 3+ (Ln = Dy, Eu) phosphors were manufactured though high-temperature solid-phase reaction. Their structural properties, optical characteristics and energy transfer mechanisms (Bi 3+ →Ln 3+ ) were analyzed in detail, and their potential application in optical thermometry was explored. Under 312 nm excitation, YNO:Bi 3+ ,Ln 3+ phosphors show broad emission from Bi 3+ ions ( 3 P 1 → 1 S 0 ) and sharp peaks from 4f-4f transitions of Ln 3+ ions. YNO:Bi 3+ ,Ln 3+ samples exhibit high sensitivity and superior thermochromic properties in temperature sensing. For YNO:Bi 3+ ,Dy 3+ phosphor, the maximum absolute sensitivity ( S a ) and relative sensitivity ( S r ) reach 14.25 %K −1 (573 K) and 1.48 %K −1 (444 K), respectively. For YNO:Bi 3+ ,Eu 3+ phosphor, the maximum S a and S r reach 38.21 %K −1 (573 K) and 1.58 %K −1 (445 K), respectively. And the chromaticity shift of emission from YNO:Bi 3+ ,Eu 3+ phosphor is 0.38 for temperature from 303 to 573 K. Such results suggest that YNO:Bi 3+ ,Ln 3+ phosphors can be candidate for visual and highly sensitive optical thermometry.
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ANALYTICA CHIMICA ACTA
·
2019
·
IF 5.256
Yajuan Cai,Xiaoyu Li,Kangbing Wu,Xiaofeng Yang
Two lanthanide metal-organic frameworks (Ln-MOFs) using 1,3,5-benzenetricarboxylic acid (H 3 BTC) and Ln(III) nitrate hydrate (Ln = Eu, Er) as precursors have been prepared through a one-step solvothermal approach. The as-synthesized compounds were characterized by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy, confirming that the targeted Ln-MOFs were successfully synthesised, with a straw-sheaf appearance. Their sensing properties were studied using cyclic voltammetry and electrochemical impedance spectroscopy , and the results showed that the prepared Ln-BTCs possessed larger electrochemical-response areas and stronger electron-transport capability, especially the Er-BTC. The oxidation behaviour of Sunset Yellow was investigated, and it was found that the Er-BTC exhibited a superior enhancement effect. Chronocoulometry was used to prove that Er-BTC more strongly adsorbs Sunset Yellow, resulting in a larger electrochemical response signal. The novel Sunset Yellow sensor exhibited a linear response in the range of 0.2–100 nM with a low limit of detection (0.05 nM, S/N = 3), and was applied in drink samples. The results were validated by high-performance liquid chromatography , indicating this sensor is a promising tool for Sunset Yellow detection.
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JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Xianli Lu,Dongming Cheng,Fuying Dong,Shirong Qin,Yachuan Liang,Yingjie Lu,Qian Liu,Chongxin Shan,Lin Dong
The rare-earth elements (REEs) derived phosphors play an essential role in light-emitting diodes. Many approaches have been proposed for tailoring the emission color of lamp phosphors by tuning the contents and valances of REEs (such as Ce 3+ , Tb 3+ , Eu 3+ ). As we know, the separation and purifying of REEs from waste phosphors usually requires high cost and complicated operations. Here we report the phosphor only based on Eu doped in different matrices with manipulated color for the first time, which will minimize the environmental challenges present in the transition to a green economy. The hybrid material is manufactured by mixing (SAOE) SrAl 2 O 4 :Eu 2+ and (TTAE) Eu(TTA) 3 phen (TTA = 2-thenoyltrifluoroacetone, phen = 1,10-phenanthroline) in different mass ratios. The optical properties of the resulting phosphor materials are determined by photoluminescence (PL). Eu doped in alkaline earth aluminates (SrAl 2 O 4 ) has strong green (510 nm) emission, meanwhile the Eu exhibits enhanced red (612 nm) luminescence upon bonding with TTA (thenoyltrifluoroacetone) and phen ligands. By adjusting the mass ratios of SAOE and TTAE, the emission colors of the hybrid materials can be tuned from red to green. The chromaticity coordinates are calculated, which fell well in the red, orange, yellow and green regions of 1931 CIE chromaticity diagram. According to the spectroscopic studies, the absorption almost have no overlap on the emissions of SAOE and TTAE powders, leading to efficient PL emitting with high photoluminescence quantum yields of 24–68%. Through deposition of the hybrid materials with polydimethylsiloxane (PDMS) onto the 365 nm UV-LED chip, tunable color light-emitting diodes are fabricated, they show excellent luminescence properties, indicating their potential application in optical device and offering a novel approach for designing multi-color phosphor materials.
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POLYMER INTERNATIONAL
·
2024
·
IF 2.9
Fang Wu,Xinfei Zhang,Qi Wang,Dayang Yu,Pan Zheng,Rongli Zhu,Xu Wang,Zejun Pu,Jiachun Zhong
In order to expand the application of biobased polycarbonate in optical components, a series of isosorbide polycarbonate (PICC)/rare earth ion complex fluorescent composites were prepared by using PICC as a macromolecular ligand and Eu 3+ and Tb 3+ as rare earth luminescence centers. The coordination system between rare earth ions and PICC was investigated by Fourier transform infrared spectroscopy, DSC and TGA. On adjusting the ratio of Eu 3+ and Tb 3+ , a PICC/rare earth ion composite with adjustable fluorescence color was obtained. Also, the thermal, mechanical and optical properties of a series of PICC/rare earth ion fluorescent films with different ratios were tested. A transparent fluorescent composite material with excellent mechanical properties and tunable fluorescent colors has been prepared. © 2024 Society of Industrial Chemistry.
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Nanoscale
·
2016
·Vol. 8
·期 22
·11580-11587
·
IF 7.76
Baojin Ma,Shan Zhang,Jichuan Qiu,Jianhua Li,Yuanhua Sang,Haibing Xia,Huaidong Jiang,Jerome Claverie,Hong Liu
Lanthanide doped fluorinated hydroxyapatite (FAp) nanoparticles are promising cell imaging nanomaterials but they are excited at wavelengths which do not match the light sources usually found in a commercial confocal laser scanning microscope (CLSM). In this work, we have successfully prepared spindle-shaped Eu/Tb codoped FAp nanoparticles by a hydrothermal method. Compared with single Eu doped FAp, Eu/Tb codoped FAp can be excited by a 488 nm laser, and exhibit both green and red light emission. By changing the amounts of Eu and Tb peaks, the emission in the green region (500–580 nm) can be decreased to the benefit of the emission in the red region (580–720 nm), thus reaching a balanced dual color emission. Using MC3T3-E1 cells co-cultured with Eu/Tb codoped FAp nanoparticles, it is observed that the nanoparticles are cytocompatible even at a concentration as high as 800 μg ml−1. The Eu/Tb codoped FAp nanoparticles are located in the cytoplasm and can be monitored by dual color—green and red imaging with a single excitation light at 488 nm. At a concentration of 200 μg ml−1, the cytoplasm is saturated in 8 hours, and Eu/Tb codoped FAp nanoparticles retain their fluorescence for at least 3 days. The cytocompatible Eu/Tb codoped FAp nanoparticles with unique dual color emission will be of great use for cell and tissue imaging.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Man-Qing Yang,Cai-Ping Zhou,Yun Chen,Jian-Jiang Li,Cheng-Hui Zeng,Shengliang Zhong
A new dinuclear europium cluster (Eu-cluster) is synthesized and the exact structure is determined by single-crystal X-ray diffraction. The formula of the Eu-cluster is determined to be [Eu 2 (4-Msal) 6 (phen) 2 (H 2 O) 2 ] (4-Msal = 4-methylsalicylic acid, phen = phenanthroline), it crystallizes in the triclinic space group P -1, with a = 9.1193(8) Å, b = 13.0855(10) Å, c = 14.0981(9) Å, α = 103.159(6)°, β = 94.192(6)°, γ = 100.632(7)°, V = 1598.3(2) Å 3 and Z = 1. Further investigation reveals that the Eu-cluster is a highly sensitive and selective methylmercury (CH 3 Hg + ) sensor. To the best of our knowledge, this is the first CH 3 Hg + sensor based on lanthanide clusters/complexes. The responsive behavior shows the sensing has excellent linearity in 1.4–3.8 μg L −1 μM. The LOD for sensing CH 3 Hg + is 0.8 μg L −1 , which meets the standard of Chinese environmental quality standard for agricultural and industrial water. Interestingly, study also reveals the sensor is applicable in real water sensing.
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CRYSTENGCOMM
·
2012
·Vol. 15
·期 5
·1001-1006
·
IF 3.842
Miao Wang,Guoqing Jiang,Yanfeng Tang,Yujun Shi
Without any templates or surfactants, large-scale 3D persimmon-shaped hierarchical LaF3 and LaF3:Ln3+ (Ln = Eu, Tb) have been synthesized via a simple hydrothermal route using organic tetrafluroborate complexes N(C4H9)4BF4 as the fluoride source. The phase and morphology of the products have been characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and selected area electron diffraction (SAED). The SEM and TEM results indicate the 3D persimmon-shaped hierarchical microstructures are constructed by numerous nanodisks with mean thickness of 50 nm. It is found that several factors, including the fluoride sources, molar ratio of reagents and the reaction time, play crucial roles in the formation of the multilayer stacked structures. Detailed studies indicate that the layer-by-layer self-assembly of nanodisks is responsible for the formation of 3D hierarchical structures. The possible mechanism of the crystal growth and assembled procedure are also proposed. Furthermore, the photoluminescent properties of LaF3:Ln3+ (Ln = Eu, Tb) are studied, which exhibit orange-red (Eu3+:5D0–7F1,2,3,4) and green (Tb3+, 5D4–7F3,4,5,6) emission, respectively.
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RSC Advances
·
2015
·Vol. 5
·期 108
·89238-89243
·
IF 3.84
Bingfu Lei,Wei Li,Haoran Zhang,Jin Wang,Yingliang Liu,Jianle Zhuang,Shi Chen
A simple and effective strategy has been carried out to design a ratiometric temperature sensor in this work. Carbon dots (CDs), which benefit from surface methoxysilyl groups after using an organosilane as a coordinating solvent, are highly reactive intermediates responsible for bonding with silanols and hydroxyl groups from the silica-coated SrAl2O4:Eu,Dy phosphor (SAO). Hence, a CD-grafted SrAl2O4:Eu,Dy phosphor (CD–SAO) could be realized using a facile one-step sol–gel method. The as-prepared CD–SAO shows the characteristic fluorescence emissions of CDs (blue) and SAO (green) at a single excitation wavelength. The temperature dependence of the fluorescence intensity ratios for the two emission bands was studied, and it turned out that the composite has a wide linear temperature sensing range, which matches well with physiologically relevant temperatures. This rather simple approach for creating dual emission enables a completely new strategy for the application of these composites in temperature sensing.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2013
·
IF 1.198
Mingguang Yu,Guangxue Chen,Jiangwen Liu,Baoling Tang,Wentao Huang
Sphere-shape Eu(DBM) 3 Phen@SiO 2 nanoparticles were fabricated by employing a modified alkaline catalyzed hydrolysis and precipitation method. The silica coated on the particles surface was obtained by means of hydrolysis and condensation of tetraethyl orthosilicate (TEOS). In this study, the particles morphology was analyzed by scanning electron microscopy (SEM) and the surface composition of samples was characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). It is confirmed that the SiO 2 shell has been coated on the rare earth complexes successfully. Moreover, the near-infrared photoluminescence emission analysis on the nanoparticles showed that the SiO 2 shell would increase the luminescence intensity of Eu(DBM) 3 Phen. This is primarily due to the reason that SiO 2 shell with chemical inertness can effectively reduce the ion Eu 3+ non-radiation transition probabilities, as well as the probability of rare earth luminescence quenching caused by the external medium.
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