RSC Advances
·
2015
·Vol. 5
·期 57
·45693-45702
·
IF 3.84
Anming Li,Dekang Xu,Hao Lin,Shenghong Yang,Yuanzhi Shao,Yueli Zhang,Zhenqiang Chen
Well-crystallized and uniform NaGd(MoO4)2 microcrystals with morphologies of bipyramids, truncated bipyramids, quasi-cubes and tetragonal plates were selectively synthesized via a facile hydrothermal method without any additives under mild conditions. The effects of Na2MoO4/Gd(NO3)3 molar ratios and pH values of precursor solutions on the phase and morphology of the as-synthesized microcrystals were systematically investigated. The molar ratios and pH values played key roles in the selective synthesis of pure phase NaGd(MoO4)2 microcrystals with regular morphology. With increasing Na2MoO4/Gd(NO3)3 molar ratios in the appropriate pH range, the morphology of the products changed from bipyramids, truncated bipyramids, quasi-cubes to tetragonal plates, namely, the morphological truncation degree increased gradually. NaGd(MoO4)2 tetragonal microplates could be synthesized at the molar ratio of 9 : 1. A possible morphological formation mechanism of NaGd(MoO4)2 tetragonal microplates was proposed, i.e. nucleation-Ostwald ripening growth process. Color tunable photoluminescence properties of NaGd(MoO4)2:Eu3+,Tb3+ microcrystals were studied in detail. Among the different morphologies of NaGd(MoO4)2:5% Eu3+ microcrystals, tetragonal microplates had a broadened, red-shifted and enhanced charge transfer band in the excitation spectrum. What's more, the full-width at half-maximum for the charge transfer band of the tetragonal plates was highest (58 nm), which favored efficient excitation and absorption in the ultraviolet region. The introduction of a small amount of Tb3+ into NaGd(MoO4)2 microplates doped with Eu3+ would enhance the 5D0 → 7FJ transition of Eu3+ at 616 nm due to the energy transfer process of cross-relaxation from Tb3+ to Eu3+. Multicolor tunable luminescence from deep red, red, orange, yellow to green under 291 nm ultraviolet excitation and from red, reddish orange to pink under 380 nm near-ultraviolet excitation could be obtained in NaGd(MoO4)2 tetragonal microplates by simply adjusting the doping concentrations of Eu3+ and Tb3+, suggesting NaGd(MoO4)2:Eu3+,Tb3+ microcrystals might have practical application in optoelectronic devices, such as light emitting diodes and color display systems. This facile morphology-controlled hydrothermal synthesis strategy was simple, low-cost and environment-friendly, and might be extended to other inorganic materials.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 20
·1-10
·
IF 2.8
Ji Changjian,Zhang Hailong,Wang Wenjing,Yuan Huimin,Zhao Gang
In order to acquire a red light-emitting component for an efficient w -LEDs device, we synthesized a series of Eu 3+ -doped Sr 2 GaTaO 6 (SGT) phosphors using a traditional high-temperature solid-phase technique. The results of UV diffuse reflectance proved that the SGT host possesses a broad optical energy bandgap ( E gap ) of 4.47 eV (calculated value). The relevant characteristic spectra were also tested. By monitoring the emission at 612 nm, the excitation peak at 466 nm matches the blue light region (460–470 nm) of the popular blue LED chips on the market. The photoluminescence (PL) spectra of SGT: Eu 3+ phosphors at room temperature consisting of four obvious PL bands ( 5 D 0 → 7 F 1 , 5 D 0 → 7 F 2 , 5 D 0 → 7 F 3 , and 5 D 0 → 7 F 4 ) in the visible range. And the PL properties are necessarily analyzed by fluorescence decay curves. And it exhibits a decent photoluminescence quantum yield (39.88%). Moreover, the color purity and the ∆E of the SGT: 0.2Eu 3+ sample are 96.5% and 0.29 eV, respectively, demonstrating that the ∆E of SGT: Eu 3+ phosphor is superior to other reported Eu 3+ -doped materials for w -LEDs applications. The results manifest that the Eu 3+ doped SGT phosphors can be outstanding candidates for w -LEDs applications with high color purity and activation energy.
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Nanomaterials
·
2022
·Vol. 12
·期 24
·4397
·
IF 5.719
Yongqiang Zhong,Qian Wu,Jiujun Zhu,Peiqing Cai,Peng Du
Luminescent materials with high thermal stability and quantum efficiency are extensively desired for indoor illumination. In this research, a series of Eu3+-activated KGd2F7red-emitting nanoparticles were prepared at room temperature and their phase structure, morphology, luminescence properties, as well as thermal stability, have been studied in detail. Excited by 393 nm, the resultant nanoparticles emitted bright red emissions and its optimal status was realized when the Eu3+content was 30 mol%, in which the concentration quenching mechanism was triggered by electric dipole–dipole interaction. Through theoretical analysis via the Judd–Ofelt theory, one knows that Eu3+situates at the high symmetry sites in as-prepared nanoparticles. Moreover, the internal and extra quantum efficiencies of designed nanoparticles were dependent on Eu3+content. Furthermore, the studied nanoparticles also had splendid thermal stability and the corresponding activation energy was 0.18 eV. Additionally, via employing the designed nanoparticles as red-emitting constituents, a warm white light-emitting diode (white-LED), which exhibits low correlated color temperature (4456 K), proper luminous efficiency (17.2 lm/W) and high color rendering index (88.3), was developed. Our findings illustrate that Eu3+-activated KGd2F7nanoparticles with bright red emissions are able to be used to promote the performance of white-LED.
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TALANTA
·
2025
·
IF 6.1
Qiaoli Yang,Xiao Yang,Ke Guo,Guangrui Pan,Qiuzheng Du,Liang Ming,Wanhai Wang
Pseudomonas aeruginosa (PA) infection poses a significant threat to human health and the economy, with the issue of drug resistance becoming increasingly severe. How to quickly, accurately, and inexpensively detect PA and differentiate live bacteria from dead ones is crucial for clinical follow-up treatment. To this end, we have developed a biosensor based on fluorescent metal-organic frameworks (MOFs) (Eu 3+ @MIL-53(Al)) and specific-phages for PA detection, where the Eu 3+ @MIL-53(Al) prepared by one-pot method exhibits excellent fluorescence properties. By covalently binding specific phages isolated from hospital wastewater to the EuMOF surface, we constructed a fluorescent biosensor capable of detecting PA within 15 min, with a sensitivity threshold of 2 CFU/mL. Notably, this biosensor demonstrates high specificity, accurately quantifying live PA in complex bacterial mixtures and distinguishing live from dead bacteria. Its practical application has been validated in clinical blood and stool samples. As a novel platform for clinical microbial monitoring, the Eu 3+ @MIL-53(Al)-phage biosensor not only holds substantial economic potential but also carries significant public health implications.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Rongbo Ma,Weichao Huang,Xinyong Gong,Chaoyong Deng
Photochromic luminescent materials have attracted much attention as a promising field in information encryption and anti-counterfeiting applications. Herein, a series of color-tunable with reversible photochromic BaSrY 4 O 8 : Bi 3+ /Eu 3+ phosphors were synthesized by the solid-state reaction method. The emission of BaSrY 4 O 8 : Bi 3+ , Eu 3+ phosphor exhibits tunable emission colors depending on the excitation wavelength or the Eu 3+ concentration. The effective energy transfers from Bi 3+ to Eu 3+ were observed, and the energy transfer mechanism was explained. Additionally, the color of the phosphor shows a reversible change from white to brown when exposed to different light stimuli (365 nm and 450 nm light). The reversible photochromic effect can be quantified by analyzing the changes in the emission spectra and diffuse reflectance spectra. The photochromic mechanism was investigated. Furthermore, an advanced anti-counterfeiting and encryption application was designed by combining multicolor luminescence with reversible photochromic under different light stimuli. The prepared anti-counterfeit pattern exhibits rapid luminescence modulation and noticeable multimodal changes in bright and dark fields. These results suggested that the BaSrY 4 O 8 : Bi 3+ /Eu 3+ phosphors are promising applications in information encryption and anti-counterfeiting.
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Materials Today Communications
·
2025
·
IF 4.5
Yutong Sun,Qun Zeng,Yanghong Cheng,Zezhong Li
A series of Tm 3+ /Dy 3+ /Eu 3+ single and co-doped LiNbO 3 color tunable phosphors were synthesized via the solid-state reaction. The phase structure, microscopic topography, optical characteristics, decay lifetimes, energy transfer processes，and thermal stability were comprehensively characterized through combined X-ray diffraction analysis, scanning electron microscope, and advanced spectroscopic methodologies. Following further in-depth analysis, the optimal concentration of dopant ions was determined, and the energy transfer effect between activators in the LiNbO 3 matrix was confirmed. The CIE demonstrated that adjusting the doping concentration of rare earth ions makes it possible to achieve polychromatic tunable light, as well as cool and warm white light. Crucially, Li 0.95 NbO 3 :0.01Tm 3+ /0.02Dy 3+ /0.02Eu 3+ phosphor exhibited remarkable thermal stability, maintaining 97.1 % of its initial strength at temperatures of 423 K. Additionally, WLEDs that have been coated with the aforementioned phosphor on a 365 nm NUV chip emit bright white light, exhibiting a color rendering index of 81.3 and correlated color temperature of 5426 K. It is powerfully suggested that the LiNbO 3 :Tm 3+ /Dy 3+ /Eu 3+ phosphors has the potential to become a new choice for WLED application.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Liang Liang,Heyi Yang,Qinan Mao,Fangyi Zhao,Yang Ding,Xinyue Li,Meijiao Liu,Jiasong Zhong
The modulated luminescent materials of the emission colors are important for multimodal information encryption. Hence, realizing multi-mode luminescence and multi-application of singly doped phosphor is still a challenge. Here, we report a self-activation LiZnSbO 4 (LZSO) host exhibiting excitation-wavelength dependent emissions, producing a blue-white emission of 497 nm, a green emission of 517 nm and a significant green persistent luminescence (PersL) phenomenon when exposed to 254 nm and 300 nm UV light for 10 s. However, the introduction of Eu 3+ produces new emission at 610 nm, and at the same time the host emission blueshifts and produces blue emission at 300 nm excitation, yet the PersL remains green (asynchronous tuning). Besides, Eu 3+ generated a surprising anti-quenching phenomenon, realizing the overall color gradually changes from greenish blue to red. Based on the different responses of the host and Eu 3+ to temperature, the maximum relative sensitivity ( S r ) values of LZSO: Eu 3+ reach as high as 5.06 % K −1 (@423 K). The designed phosphors exhibit excitation-wavelength and temperature-dependent emissions and PersL, providing a more substantial advancement in the multi-application effect of information encryption and optical thermometers.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-11
·
IF 4.259
Wang Jing,Bu Yanyan,Wang Xiangfu,Seo Hyo Jin
Optical thermometry based on the up-conversion intensity ratio of thermally coupled levels of rare earth ions has been widely studied to achieve an inaccessible temperature measurement in submicron scale. In this work, a novel optical temperature sensing strategy based on the energy transfer from charge transfer bands of W-O and Eu-O to Eu 3+ -Dy 3+ ions is proposed. A series of Eu 3+ /Dy 3+ co-doped SrWO 4 is synthesized by the conventional high-temperature solid-state method. It is found that the emission spectra, emission intensity ratio of Dy 3+ (572 nm) and Eu 3+ (615 nm), fluorescence color, lifetime decay curves of Dy 3+ (572 nm) and Eu 3+ (615 nm), and relative and absolute sensitivities of Eu 3+ /Dy 3+ co-doped SrWO 4 are temperature dependent under the 266 nm excitation in the temperature range from 11 K to 529 K. The emission intensity ratio of Dy 3+ (572 nm) and Eu 3+ (615 nm) ions exhibits exponentially relation to the temperature due to the different energy transfer from the charge transfer bands of W-O and Eu-O to Dy 3+ and Eu 3+ ions. In this host, the maximum relative sensitivity S r can be reached at 1.71% K −1 , being higher than those previously reported material. It opens a new route to obtain optical thermometry with high sensitivity through using down-conversion fluorescence under ultraviolet excitation.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2025
·Vol. 54
·期 6
·4882-4890
·
IF 2.5
Fu Yingtao,Chen Zhaoyang,Sun Yifan,Liu Yi,Fan Yanwei,Wang Junhua,Chen Huiming
In order to develop glass-ceramic materials capable of emitting neutral white light and to address the limitations of single rare earth element ion-doped luminescent materials, a glass-ceramic material containing Dy 3+ /Eu 3+ -co-doped NaCaPO 4 nanocrystals was successfully synthesized using the melt-quenching and two-step crystallization methods. The prepared glass-ceramic materials were characterized by X-ray diffraction, transmission electron microscopy, and photoluminescence spectroscopy. The energy transfer process between Dy 3+ and Eu 3+ ions was confirmed through excitation spectra, emission spectra, and luminescence decay curves. The emission coordinates and correlated color temperatures of samples with different doping concentrations were calculated using the standard CIE 1931 colorimetric system. The results showed that coordinated emission was achieved in the glass-ceramic containing NaCaPO 4 nanocrystals under excitation at 363 nm. Furthermore, by adjusting the concentration ratio of Dy 3+ and Eu 3+ ions, the color temperature of the white light emission could be tuned from 9910 K to 5349 K, enabling modification of the emission color from the cool-white region to the pure-white region, with chromaticity coordinates reaching (0.3350, 0.3040). Additionally, the material exhibited high thermal stability, with an activation energy of 0.18649 eV. It is expected that the Dy 3+ /Eu 3+ -co-doped NaCaPO 4 glass-ceramic studied here has broad prospects for applications in white light-emitting diodes.
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CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 21
·34134-34144
·
IF 5.6
Fei Wang,Shiwei Zhang,Huiqing Jin
Mn 4+ has been widely used in the field of optical temperature measurement and plant growth illumination because of its special luminous properties. In this study, a series of novel red-emitting phosphors Ca 3 La 2- x W 2 O 12 : x Eu 3+ ,0.008Mn 4+ (CLWO: x Eu 3+ ,Mn 4+ ) (0≤ x ≤ 0.12, Δ x= 0.02) were successfully synthesized via a high-temperature solid-state method. Systematic investigations were conducted on the crystal structure, morphological characteristics, elemental distribution, luminescent properties, thermal stability, and electroluminescence spectra of CLWO:Eu 3+ ,Mn 4+ phosphor. The results demonstrate that CLWO:0.02Eu 3+ ,0.008Mn 4+ phosphor exhibits excellent optical temperature sensing performance (S a = 0.55 K -1 @433 K, S r = 3.21 %K −1 @423 K). Moreover, the electroluminescence spectrum of the LED device fabricated using CLWO:0.06Eu 3+ ,0.008Mn 4+ phosphor shows a high degree of spectral overlap with the absorption spectra of chlorophyll (B) and phytochromes (P r , P fr ), which are essential for plant growth. These findings strongly indicate that CLWO:Eu 3+ ,Mn 4+ phosphor holds significant potential for applications in both optical thermometry and plant growth lighting.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Wei Ding,Xiaoyan Liu,Waquar Ahmed Khokhar,Chengbiao Wei,Faisal U.L. Rehman,Guoxu Wang,Zafar Mahmood,Abdur Raheem Aleem
Vegetables and fruits are essential sources of nutrients, minerals, vitamins, and dietary fiber for a well-balanced diet. However, excessive pesticide use, particularly 2,6-dichloro-4-nitroaniline (DCN), poses serious health and environmental risks. Traditional pesticide detection methods require expensive equipment, trained personnel, making them unsuitable for on-site sensing. In this study, we synthesized europium (Eu 3+ ) complexes incorporating heparin sodium (Hep) and chitosan (CS) to develop a rapid, cost-effective, and highly sensitive fluorescent sensor for DCN detection. The optimized Eu 3+ complex (ETP-HS3) demonstrated excellent water stability, strong red fluorescence, and a long fluorescence lifetime (888.09 μs). It exhibited a low limit of detection (LOD = 0.9049 μM), a rapid sensing response (20 s), and a high quenching constant (Ksv = 1.226 × 10 4 M −1 ), making it an effective and portable fluorescence sensor for real-time pesticide monitoring. The fluorescence quenching mechanism was thoroughly investigated, confirming the selectivity and efficiency of the sensor.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 101
·98554-98562
·
IF 3.289
Li Wang,Haoran Zhang,Xiaohua Zhou,Yingliang Liu,Bingfu Lei
In this work, we present a rapid, selective and highly sensitive sensor for the detection of oxygen based on ratiometric fluorescent luminescent carbon dots (CDs) grafted CaSiO3:Eu3+. Highly monodispersed porous silica microspheres are obtained with particle sizes in the range between 120 and 180 nm, providing a key precursor to prepare the CaSiO3:Eu3+ phosphor. The fluorescence of CDs grafted CaSiO3:Eu3+ could be quenched by oxygen and the red emission of Eu3+ (613 nm and 703 nm) and the blue emission of the CDs (454 nm) were effectively reduced as the concentration of oxygen increased. The CaSiO3:Eu3+ phosphor shows little effect on oxygen, while CDs grafted CaSiO3:Eu3+ shows good oxygen sensing properties, the response time is determined to be about 4–7 s and the recovery time is 18–29 s. The obtained CDs grafted CaSiO3:Eu3+ sample appears to be a promising sensing material for environmental detection applications and would also find applications in catalysis, electrodes, or related fields.
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