ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 35
·期 2
·2412480
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IF 18.5
Ming Zhao,Yeping Ge,Yurong Li,Xiaoyan Song,Xinping Zhang
The advancement of Eu 2+ -activated luminescent materials tailored to exhibit a range of properties is crucial for addressing the specific demands of various application fields. However, the lack of suitable lattice sites in numerous compounds for stable Eu 2+ incorporation restricts their potential for diverse optical properties. Herein, a facile strategy of carbon and hydrogen coreduction utilizing graphite crucibles is proposed to effectively achieve the impressive luminescence of Eu 2+ at trivalent Y sites in Rb 3 Y(PO 4 ) 2 :Eu phosphors. Rb 3 Y(PO 4 ) 2 :Eu exhibits blue-violet emission when Eu 2+ predominantly occupies the Rb1 and Rb2 sites. Inspiringly, by facilitating the reduction of more Eu 3+ to Eu 2+ , a yellow emission band at 550 nm arising from Eu 2+ at Y sites emerges, enabling the realization of single-component white-emitting and yellow-emitting Rb 3 Y(PO 4 ) 2 :Eu phosphors. The diverse luminescent properties of Rb 3 Y(PO 4 ) 2 :Eu expand its potential applications in different white light source devices and optical thermometry. This work presents an innovative synthetic strategy to develop remarkable Eu 2+ luminescence at trivalent cation sites, thereby broadening the optical properties of the material and enabling multifunctional applications.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Jun Yao,Zhuang Xie,Xiang Zeng,Li Wang,Tingting Yue
Cholesterol is one of the most significant indicators to assess health status. Lanthanide metal-organic frameworks (Ln-MOFs) have a unique luminescence mechanism, which makes it possess tremendous potential in biomonitoring. Thus, on the basic of intramolecular charge transfer theory and quenching effect, the metal-organic frameworks (MOFs) doped by europium was constructed to respond to the cholesterol in serum. The charge transfer direction and the sensing mechanism of fluorescent probe were explained in detail by cross-corroboration of experiment and calculation. The possible sensing mechanism was explained at the molecular level with density functional theory (DFT). With the excitation of 350 nm, the emission peaks at 458 nm and 615 nm which corrsponded to MIL-53(Fe) and Eu centers, appeared enhancement and quenching respectively. To investigate the emission law, the density of states and partial density of states were used to explain the internal electron migration of the probe and the possible sensing mechanism. The results showed the electron transfer efficiency of MIL-53(Fe) was enhanced after Eu 3+ doping, which brought a remarkable improvement in response sensitivity. Meanwhile, the higher energy possessed by the excited state of Eu will lead to the capture of its own electrons by hydrogen peroxide, thus reducing the number of electrons returned to the ground states of Eu and eventually leading to the fluorescence quenching of 615 nm. We anticipate the proposed research is to be an emerging method in cholesterol determination and have further development in all walks of life.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Jian Xu,Yang Yang,Ziquan Guo,Baofu Hu,Jian Wang,Baoli Du,Bingguo Liu,Haipeng Ji,Carsten Dam-Hansen,Ole B. Jensen
Even though CaAlSiN 3 :Eu 2+ (CASN) is, in many regards, a highly suitable red phosphor that can be used in white light-emitting diodes, it can hardly be used in high-power laser-lighting because of its low saturation-threshold. By using CASN-based composite ceramics, it is possible to increase the threshold but new difficulties appear. These include complex and expensive synthesis, while the saturation-threshold still has room for improvement. In this study, we prepare a CASN/glass composite film , using an industry-friendly blade-coating method. The film has a high internal quantum efficiency of 79%, which suggests low conversion loss. Under 1.17 W blue laser excitation, a high luminous efficacy of 21.0 lm/W can be obtained. More importantly, the composite film shows a record-high saturation-threshold of more than 12.7 W (∼320 W/cm 2 ) blue laser excitation. With these outstanding properties, CASN/glass composite films may open doors towards commercially viable red color converters for high-power laser-lighting applications.
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ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Zifei Wu,Hao Ding,Kailai Xu,Chenghui Li,Xiandeng Hou
Background due to the toxicity and widespread distribution of inorganic mercury ions (Hg 2+ ), it is a crucial task for researchers to develop simple methods for field analysis of water samples for trace Hg 2+ . Result a colorimetric and ratiometric fluorescent dual-mode assay based on bifunctional UiO–(COOH) 2 –NH 2 /Eu and gold nanocomplexes (AuNPs@UiO–(COOH) 2 –NH 2 /Eu) was constructed for the sensitive, selective and potentially on-site determination of Hg 2+ . The incorporation of Hg 2+ resulted in the formation of gold amalgam, which enhanced peroxidase-like activity of AuNPs@UiO–(COOH) 2 –NH 2 /Eu, accelerating the oxidization of zymolyte 3,3′,5,5′-tetramethylbenzidine (TMB). Concurrently, the color of the reaction solution turned blue, and the RGB (red, green, and blue) of the solution color changed accordingly. The fluorescence at 618 nm was almost unchanged with the increase of Hg 2+ concentration, whereas the fluorescence at 460 nm was obviously quenched due to the inner filter effect (IFE). Under UV irradiation, the fluorescence emission of the sensing system changed from blue to red, enabling easy visual detection. The probe showed great linearity over a wide range of 20–1200 nM (colorimetric) and 50–4000 nM (fluorescent), with limits of detection (LODs) of 8 nM and 3 nM, respectively. Significance the proposed method was successfully applied to the determination of trace Hg 2+ in tap water and groundwater, while the use of a smartphone enables its simplicity and portability. The results show that the colorimetric and ratiometric fluorescent dual-mode method based on AuNPs@UiO–(COOH) 2 –NH 2 /Eu can achieve rapid visual determination of Hg 2+ potentially useful for on-site analysis.
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PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2011
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IF 5.874
Jing Hu,Xiaoming Jiang,Lan Wu,Kailai Xu,Xiandeng Hou,Yi Lv
In this work, a novel dual-channel sensing mode, i.e., UV-induced surface photovoltage (SPV) and photoluminescence (PL) on n-type Si/TiO2/Eu3+-doped TiO2 (n-Si/TiO2/TiO2:Eu), was demonstrated for the discrimination of 20 volatile compounds. The SPV signaling in this work employed a laboratory-constructed microvoltammeter with good analytical performances. This device also features wireless communication, portability, along with low cost and power consumption. The SPV and PL pattern of each analyte was distinct, and the hierarchical clustering analysis (HCA) result showed that these 20 volatile species were distinguishable, even for structural isomers. Linear discriminant analysis (LDA) further demonstrated the robustness of this sensor: 180 unknown samples from three groups at concentrations of 15.3, 31.7, and 79.2 mg/L were classified with accuracies of 96.7%, 95.0%, and 100%, respectively. Principal component analysis (PCA) revealed that SPV and PL channels contributed equally to the good discrimination ability due to two distinct sensing mechanisms. This dual-channel sensor was also successfully applied in the discrimination of beverage samples such as liquor, wine, and vinegar.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 9
·3337-3347
·
IF 4.39
Panpan Du,Siyuan Li,Xuejiao Wang,Qi Zhu,Ji-Guang Li
Solid-state reaction at 1000 °C produces a series of Li-stuffed Li5+2x(La1−yEuy)3(Ta1−xZrx)2O12 garnet phosphors (x = 0–1, y = 0.05–0.6) that exhibit favorable efficiency and thermal stability for red luminescence under either blue or n-UV light excitation, where the optimal composition was identified to be x = 0.5 and y = 0.4. The concentration quenching of luminescence was determined to occur via electric dipole–dipole interactions. Zr4+ substitution for Ta5+, accompanied by additional Li+ for charge compensation, was found via Rietveld structure refinement and Raman/UV-Vis spectroscopy to profoundly affect the tetrahedral and octahedral occupancies of Li, the symmetry of (La/Eu)O8 dodecahedron, and the bandgap of the host lattice and cation disorder, with which the systematically varying excitation and emission behaviors of Eu3+ were deciphered. The Li6(La0.6Eu0.4)3(Ta0.5Zr0.5)2O12 optimal phosphor showed quantum yields of ∼40 and 48% under 393 and 463 nm excitations, respectively, a fluorescence lifetime of ∼0.66 ms for its main emission at 610 nm, color coordinates of around (0.653, 0.347), and can retain as high as ∼85% of its room-temperature emission intensity at 423 K. The phosphor also exhibited a favorable performance for n-UV excited LED lighting.
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PubMed
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Analytical Methods
·
2024
·
IF 2.7
Huifeng Xu,Weihua Huang,Rui Pan,Ronglin Chen,Lili Wang,Yun Yu,Xihai Li,Xi Zhu
A stable dual-emission fluorescent system, R6G/Eu-MOF, was obtained by simple mixing Eu-MOF with fluorescent rhodamine 6G (R6G). This system not only achieved robust dual luminescence performance at 430 nm (Eu-MOF) and 555 nm (R6G) under single-wavelength excitation, but also endowed it significantly improved fluorescence stability. Orientin (OT), a bioactive traditional Chinese medicine (TCM) component, was found to efficiently quench the dual fluorescent emissions via the synergistic effect of dynamic quenching effect, photo-induced electron transfer and molecular interactions. Therefore, a rapid fluorescent assay for OT was developed based on the variations in fluorescence signals at 430 nm and 555 nm, as well as the alterations in the ratio between these two signals. This method can achieve highly sensitive determination of OT in the linear range of 1.1-220 µM, with a LOD of 0.26 µM at 430 nm and 0.16 µM at 555 nm (3σ/N). The R6G/Eu-MOF hybrid exhibits significantly lower detection limits and a broader linear range OT than either R6G or Eu-MOF alone. This work presents a simple strategy to improve the water stability of Eu-MOF, and also provides a rapid analysis of small molecule drug using a fluorescence approach based on dual-emission MOF hybrid system.
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PubMed
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Z.H. Xu,C. Wang,X.Z. Xiong,W.B. Dai
Borate-based phosphors, as a critical class of luminescent materials, have garnered significant attention due to their stable crystal structures, wide bandgaps, excellent thermal stability, and robust spectral tunability, making them essential components in white light-emitting diodes ( w LEDs) technologies. In this work, a high-symmetry Ba 3 Y 2 B 6 O 15 (BYB) phosphor co-doped with Bi 3+ , Tb 3+ , Eu 3+ , and Lu 3+ was synthesized via a multi-step sol-gel method. Different photoluminescence (PL) behaviors of Bi 3+ , Tb 3+ and Eu 3+ in BYB were systematically revealed. By modulating the PL spectrum via energy transfer (ET) from Bi → Tb → Eu, ‘cool’ white-light emission was achieved. A strategy of replacing Y 3+ with Lu 3+ was adopted to adjust the crystal field splitting and symmetry. This modification broadens the blue light coverage range in Bi 3+ PL, increases the hypersensitive transition of Eu 3+ ( 5 D 0 → 7 F 2 ), increase the intensity of red emission. They achieved their optimal balance ultimately. The improved structural compactness and rigidity reduced electron-phonon coupling effects, endowing the phosphor with superior chemical/thermal stability. Finally, a high-performance phosphor-converted w LED (pc- w LED) device with chromaticity coordinates of (0.361, 0.358), a luminous efficacy (LE) of 95.2 lm/W, was fabricated by integrating the optimized BYB: Bi/Tb/Eu/Lu phosphor with a UV LED chip using remote ‘cap’ packaging, demonstrating exceptional performance.
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JOURNAL OF SOLID STATE CHEMISTRY
·
2026
·
IF 3.2
Weiwei Cheng,Shuyue Xu,Chengnan Wang,Jinyi Dong,Weina Jiang,Yunshan Xue
Industrial emissions of heavy metal ions and oxygen-containing anions, antibiotic residues caused by pharmaceutical and agricultural activities, and toxic ions such as Fe 3+ introduced by nuclear industry leaks, collectively form a complex water pollution. Here, we report the successful synthesis of a novel europium-based metal-organic framework (Eu-MOF) through a hydrothermal approach employing a flexible V-shaped dicarboxylic acid ligand. The single crystal X-ray diffraction results indicate that the Eu-MOF belongs to the orthorhombic crystal system. Its basic structural unit is a one-dimensional coordination chain, which is further assembled by hydrogen bonding and π - π stacking between molecules, ultimately forming a stable three-dimensional supramolecular structure. Leveraging the intense red emission of Eu 3+ and its robust structural integrity, the Eu-MOF demonstrates remarkable sensitivity and specificity in the fluorescence detection of Fe 3+ , MnO 4 − , and nitrofurantoin (NFT) in aqueous solutions, featuring low detection limits and substantial quenching constants. Mechanism studies have shown that the structure of the material remains stable during the sensing process, and fluorescence quenching is mainly caused by the combined effects of static quenching, competitive absorption, and photo-induced electron transfer. This research introduces a dependable multifunctional luminescent platform for the swift and precise monitoring of various hazardous environmental contaminants.
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MICROCHEMICAL JOURNAL
·
2026
·
IF 5.2
Yan-Fang Feng,Bi-Liu Lan,Zi-Ling Li,Tao Deng,Bo Zhou,Yu-Ning Liang,Zhong Zhang
Lanthanide metal–organic frameworks (Ln-MOFs) show promise for ratiometric biosensors owing to their tunable photoluminescence and rich energy transfer processes among Ln 3+ , organic ligand and photosensitizer, yet face challenges in environmental stability and susceptibility of energy transfer to external stimuli. Herein, a ligand-locked post-synthetic metalation (PSMet) strategy, namely grafting Cu(acac) − units to the free bipyridine sites of 2,2′-bipyridine-5,5′-dicarboxylate (bpydc 2− ) linkers in Eubpydc, was applied to develop a water-stable and dual-emissive Eu-MOF sensor, Cu@Eubpydc. Due to the conformation locking of bipyridine moiety via chelating to Cu(acac) − , the MOF network rigidity is reinforced and water stability is improved. Meanwhile, this modification impedes the energy transfer from the organic linkers to Eu 3+ , boosting ligand-based fluorescent emission, which is more sensitive to external factors than Eu 3+ emission. The post-synthetic Cu@Eubpydc as a ratiometric fluorescence (RF) sensor exhibited a sensitive response to a narrow pH change between 3.1 and 4.0, as well as low detection limits of 80 nM, 107 nM, and 64 nM for common neurotransmitters aspartic acid, glutamic acid, and glutathione, respectively. The pH response mechanism involves the binding of H + to the N-donor of the unmetallized bpydc 2− ligand through hydrogen bonding. In contrast, neurotransmitters sensing relies on hydrogen bonding interaction, absorbance-caused enhancement, as well as acidity enhancement aroused by redox reaction. Additionally, Cu@Eubpydc was finally applied to neurotransmitters determination in serum samples, and its satisfactory recovery rate confirm its practical utility. This work uncovered that the ligand-locked PSMet strategy opens a new avenue for constructing Ln-MOFs with excellent water stability and RF sensing capabilities.
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JOURNAL OF FLUORESCENCE
·
2026
·
IF 3.4
Chen Licong,Shi Rui,Han Yunfei,Wang Limei,Li Xingyun,Wang Zhongzhi
1-Hydroxypyrene (1-HP) is the final metabolite of polycyclic aromatic hydrocarbons in the human body, and Fe 3+ is an important trace element for human growth and metabolism. When 1-HP or Fe 3+ is detected in human urine, it indicates that there is a problem with the human health condition. The detection of 1-HP and Fe 3+ in urine can reflect the health status of the human body. In this work, Eu(III) complexes coated silane coupling agent (WD-53) modified spherical SiO 2 core-shell composite material (SiO 2 -WD-53@L-Eu) was prepared and used as the fluorescent probe for detecting 1-HP and Fe 3+ . The fluorescence intensity of SiO 2 -WD-53@L-Eu with the same mass concentration is 1.37 times that of L-Eu, while the content of Eu 3+ in SiO 2 -WD-53@L-Eu is only about one-third of L-Eu. Moreover, the dispersion stability of SiO 2 -WD-53@L-Eu in solvents is much higher than that of L-Eu. Furthermore, SiO 2 -WD-53@L-Eu exhibits the sensitive response to 1-HP and Fe 3+ without interference from inorganic salts, urea, glucose and other components. The fluorescence quenching constants for detecting 1-HP and Fe 3+ are 9.62 × 10 5 M − 1 and 5.29 × 10 3 M − 1 , respectively, and the limits of detection are 5.93 × 10 − 6 M and 1.08 × 10 − 3 M, respectively. We further employed the SiO 2 -WD-53@L-Eu composite material within a Tris-HCl buffer to detect 1-HP and Fe 3+ , respectively, and obtained Stern-Volmer quenching constants (K sv ) of 3.662 × 10 5 M − 1 and 1.957 × 10 3 M − 1 . Compared to L-Eu, composite material SiO 2 -WD-53@L-Eu has higher fluorescence efficiency, better dispersion stability and chemical stability. Therefore, SiO 2 -WD-53@L-Eu is considered a promising material for detecting 1-HP and Fe 3+ in urine.
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Materials Today Communications
·
2026
·
IF 4.9
Xingyuan Tao,Xiaoxia Duan,Guang Zheng,Yiwen Liu,Qingxue Zhao,Dawei Wang,Lixin Yi
Core-shell precursor boosts Eu 2+ dispersion and NIR emission in BaS host. • Wet-chemistry-assisted synthesis suppresses S-related defects, enabling NIR emission. • S-related defects act as both luminescent and quenching centers in BaS:Eu. This study develops an innovative wet-chemistry-assisted method for synthesizing BaS:Eu near-infrared (NIR) phosphors. By sequentially precipitating Eu 3+ and Ba 2+ in alkaline solution, a core-shell BaSO 4 @Eu(OH) 3 precursor is obtained, in which the subsequently formed BaSO 4 is inferred to encapsulate the preformed Eu(OH) 3 nuclei. SEM/EDS and XPS analysis show no detectable Eu on the particle surface, supporting this core–shell-like configuration. After sintering in CO reducing atmosphere at 1300 °C, BaS:Eu 2+ is obtained. Under 450 nm excitation, the material exhibits strong NIR broadband emission centered at 715 nm, attributed to the 4 f 6 5d 1 →4 f 7 transition of Eu 2+ in the octahedral crystal field of BaS. Compared with conventional solid-state routes using Eu 2 O 3 or Eu 2 (SO 4 ) 3 , this wet-chemistry-assisted approach appears to improve doping homogeneity in the product system and reduce Eu 2+ aggregation on the particle surface, as reflected in enhanced absorption characteristics and NIR emission intensity. The core-shell precursor configuration is suggested to suppress sulfur-related defect emission by limiting Eu exposure at the particle surface and by controlling the Ba-to-S ratio. Analysis of the luminescence behaviors indicates that sulfur-related defects act as both emission and quenching centers. Overall, this work offers a precursor-engineering strategy that may be extended to develop high-performance NIR-emitting materials. Download: Download high-res image (175KB) Download: Download full-size image
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