CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Shiyu Xu,Junjie Fu,Xuening Liu,Meiyu Yuan,Chaoqun Zhang,Haibo Wang,Guangxi Liu,Sheng Cui
A family of highly thermal chromatic stable Dy 3+ -Eu 3+ doped B 2 O 3 -Bi 2 O 3 -ZnO-Li 2 O (BBZL) glass samples was synthesised using the high-temperature melt quenching technique. The optical and thermal stability properties of the samples were analysed using their fluorescence spectra at various temperatures, fluorescence lifetime decay times and colour coordinates. The Dy 3+ -doped BBZL (BBZL: Dy) glass samples generated cold white light when exposed to ultraviolet (UV) light, while the Dy 3+ -Eu 3+ -doped BBZL (BBZL: DyEu) glass samples emitted neutral and warm white light, which can be attributed to the introduction of Eu 3+ that substantially enhanced the colour rendering of samples. An overlap of the excitation-emission spectra of Eu 3+ and Dy 3+ indicated an energy transfer between Dy 3+ and Eu 3+ . Under a 350 nm excitation, the fluorescence lifetime of BBZL: DyEu decreased from 0.5348 to 0.3642 ms. Using the Dexter theory, the energy transfer between Dy 3+ and Eu 3+ was demonstrated to be an electric dipole-electric dipole leap. The chromaticity shifts of BBZL: DyEu were 8.60 × 10 −4 and 9.40 × 10 −4 at 448 and 498 K, respectively, reflecting the high thermal stability of the sample chromaticity. The study demonstrated that Dy 3+ -Eu 3+ doped borate glasses can be used as tunable luminescent materials in high-power white light-emitting diodes to mitigate the chromaticity shift in fluorescent materials at high temperatures.
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高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
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2022
·
IF 0.847
Fazheng Huang,Xinhao Li,Zhen Zhang,Ziqi Jiang,Guoqiang Wang,Lingyun Li,Yan Yu
The exploration of a dual-functional sensor is the key to effectively detect the Cr(VI) and Fe(III) cations in water, which is important to human health and environmental sustainability. Because of the phase stability and excellent luminescence, the rare-earth coordination polymers have great potential as dual-functional sensors. Here, we develop a Y 0.91 Eu 0.09 (H 2 O) 2 {C 6 H 3 (CO 2 ) 3 }(MIL-92(Y):9%Eu 3+ )-based dual-function luminescent sensor on Cr(VI) and Fe(III), which exhibits excellent phase stability and dispersibility in water. The luminescence of MIL-92(Y):9%Eu 3+ aqueous suspension quenches on Fe 3+ with Stern-Volmer constant K sv of 1.79 × 10 3 M -1 and limit of detection of 17 μM. The MIL-92(Y):9%Eu 3+ aqueous suspension also has turn-off sensing ability towards Cr 2 O 7 2- and CrO 4 2- with K sv values of 3.5 × 10 3 and 6.14 × 10 3 M -1 , respectively. It has detection limitations of 10 and 5 μM on Cr 2 O 7 2- and Cr 2 O 7 2- ions, respectively.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Yifang Lin,Daomiao He,Kezhou Jiang,Renkang Qin,Jingfei Wang,Yumeng Shao,Jiaxin Yan,Ruijin Yu,Dan Zhang,Shouan Xie,Lei Zhao
A new series of red luminescent K 5 La(MoO 4 ) 4 : x Eu 3+ (KLMO: x Eu 3+ ) phosphors ( x = 0.05–1.00 mol) was successfully synthesized by a high-temperature solid phase reaction at a low reaction temperature (600 ℃). The X-ray diffraction (XRD) pattern, photoluminescence properties, thermal quenching mechanism, quantum efficiency, and lifetime decay curves of the phosphors were measured and discussed in detail. The prepared phosphors exhibited strong red-light emission (at 615 nm) upon excitation at 394 nm, attributed to the electric dipole 5 D 0 - 7 F 2 transition of Eu 3+ . The optimal doping concentration of phosphors is 0.8 mol. The quenching temperature of the KLMO:0.80Eu 3+ phosphor was found to exceed 480 K, with high activation energy ( E a ) of 0.43 eV, showing good thermal stability. Impressively, the KLMO:0.80Eu 3+ phosphor with a 0.8 mol concentration of Eu 3+ doping also has an internal quantum efficiency (IQE) of up to 84.5%. The packaged white light emitting diode (w-LED) showed a good color rendering index (CRI) (89), correlated color temperature (CCT) (5117 K), and the Commission International de L′Eclairage (CIE) chromaticity coordinates (0.342, 0.345). Furthermore, the KLMO:0.80Eu 3+ phosphor was surface-functionalized with oleic acid (OA) (KLMO:0.80Eu 3+ @OA) to help better identify Level I-III fingerprint details with high resolution and contrast. The results show that the KLMO:Eu 3+ and KLMO:Eu 3+ @OA phosphors have very promising applications in the w-LEDs and latent fingerprints (LFPs).
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JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Linru Guo,Yanzhu Liu,Jibo Dou,Qiang Huang,Yuan Lei,Junyu Chen,Yuanqing Wen,Yongxiu Li,Xiaoyong Zhang,Yen Wei
The removal of environmental pollutants through adsorption by nanomaterials or nanocomposites has attracted great attention over the past few decades. In this work, a novel strategy that combined with Diels-Alder (DA) and multicomponent reactions has been developed to fabricate carbon nanotubes (CNT) based polymer composites and their potential utilization for removal of rare earth ions from wastewater. First, the amino groups were introduced on the CNT through the DA reaction between CNT and furfurylamine. The obtained amino group-terminating CNT composites (named as CNT-FFA) were further conjugated with the polymers through Kabachnik–Fields (KF) reaction. To evidence the successful fabrication of these CNT based polymer composites, a variety of characterization methods, such as Fourier transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS), were used to measure the chemical structure, compositions and thermal stability of CNT based polymer composites. Furthermore, a series of adsorption experiments were implemented to explore the influence of contact time, temperature, initial concentration and pH for adsorption behavior . The results demonstrated that the adsorption capability of resultant CNT based composites (CNT-FFA-PAA) towards Eu 3+ ions is about 130.8 mg g −1 , which is much greater than that of pristine CNT (46.67 mg g −1 ). The above results demonstrated that the method described in this work is a facile and effective tool for fabrication of functional CNT polymer composites, which possess promising prospects for environmental adsorption applications. More importantly, this method in this work could be generally applied in the surface modification of other materials for various applications.
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高影响因子
JOURNAL OF LUMINESCENCE
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2020
·
IF 3.28
Zongjie Zhang,Liangling Sun,Balaji Devakumar,Jia Liang,Shaoying Wang,Qi Sun,Sanjay J. Dhoble,Xiaoyong Huang
High-efficiency red-emitting phosphors are required to fabricate high-performance white light-emitting diodes (LEDs). Herein, the novel highly efficient Eu 3+ -activated Ca 2 GdSbO 6 double-perovskite red phosphors with good thermal stability toward warm-white LEDs were reported. A series of Ca 2 Gd (1- x ) Eu x SbO 6 red phosphors with different Eu 3+ doping concentrations ( x = 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 and 0.8) were synthesized by using high-temperature solid-state reaction method. Under the excitation of 396 nm near-ultraviolet light, these Ca 2 Gd (1- x ) Eu x SbO 6 phosphors showed intense red emissions peaking at 612 nm due to the 5 D 0 → 7 F 2 transition of Eu 3+ ions. The strongest luminescence intensity reached when Eu 3+ doping concentration was x = 0.5, and the critical distance between Eu 3+ activators was calculated to be 7.97 Å. The concentration quenching mechanism was due to the dipole-dipole interaction of Eu 3+ ions. The CIE color coordinates of the optimal Ca 2 Gd 0.5 Eu 0.5 SbO 6 phosphors were determined to be (0.6629, 0.3367), and the corresponding color purity reached about 94.9%. Importantly, the Ca 2 Gd 0.5 Eu 0.5 SbO 6 phosphors revealed outstanding internal quantum efficiency of 73% and good thermal stability. The emission intensity of Ca 2 Gd 0.5 Eu 0.5 SbO 6 phosphors at 423 K still remained about 73% of its initial value at 303 K. Finally, a prototype white LED device was fabricated by coating the phosphor blend of commercial blue-emitting BaMgAl 10 O 17 :Eu 2+ , green-emitting (Ba, Sr) 2 SiO 4 :Eu 2+ and our as-prepared red-emitting Ca 2 Gd 0.5 Eu 0.5 SbO 6 on a 395 nm LED chip. Under 20 mA driven current, the device showed bright warm-white light with CIE color coordinates of (0.3888, 0.3943), correlated color temperature of 3911 K, and color rendering index of 88.4. The results demonstrated that the developed novel red-emitting Ca 2 Gd 0.5 Eu 0.5 SbO 6 phosphors could be used as potential color converters in white LEDs.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2015
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IF 2.288
Qiang Zhang,Ye Sheng,Keyan Zheng,Xuming Qin,Pingchuan Ma,Haifeng Zou
Novel organic–inorganic hybrid amorphous thin films were synthesized by linking lanthanide (Tb 3+ , Eu 3+ ) complexes through 3,4-bis(3-(triethoxysilyl)propylcarbamoyloxy)benzoic acid using sol–gel method. These inorganic–organic hybrids were characterized in detail by Fourier transform infrared spectroscopy, wide angle X-ray diffraction, themogravimetric analysis, scanning electron microscope, and fluorescence spectra. The above research results indicate that the hybrids possess high thermal-stability, amorphous structure features and especially favorable luminescent performances, such as long luminescent decay lifetime, high quantum yield etc.
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高影响因子
NANOTECHNOLOGY
·
2016
·Vol. 27
·期 31
·315101
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IF 3.573
Jia Liu,Yating Zhao,Yu Cui,Yang Yue,Yikun Gao,Qinfu Zhao,Jie Liu,Siling Wang
A structurally controllable fluorescence-labeled hollow mesoporous carbon (HMC) was simply prepared to improve the oral bioavailability of insoluble drugs and further trace their delivery process in vivo. The hollow structure was derived from an inverse replica process using mesoporous silica as a template and the fluorescent label was prepared by doping the carboxylated HMC with a confinement of Eu3+/Gd3+-EDTA. The physicochemical properties of the composites were systematically characterized by transmission electron microscopy, Fourier transform infrared spectroscopy and photoluminescence spectra tests prior to studying their effects on drug-release behavior and biodistribution. As a result, the thickness of the carrier's shell was adjusted from 70 nm to 130 nm and the maximum drug loading was up to 73.6%. The model drug carvedilol (CAR) showed sustained release behavior compared to CAR commercial capsules, and the dissolution rate slowed down as the shells got thicker. AUC0-48h and Tmax were enlarged 2.2 and 6.5 fold, respectively, which demonstrated that oral bioavailability was successfully improved. Bioimaging tests showed that the novel carbon vehicle had a long residence time in the gastrointestinal tract. In short, the newly designed HMC is a promising drug carrier for both oral bioavailability improvement and in vivo tracing.
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DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 111
·110409-110415
·
IF 3.289
Jin Dong,Baoping Lin
As an effective luminescent down-shifting (LDS) species, Eu3+ complexes have been doped in ethylene-vinyl acetate (EVA) films to improve the spectral response of silicon photovoltaic modules in the ultraviolet region. One key point about the improvement of photoelectric conversion efficiency by the LDS technique is increasing the fluorescence intensity of the EVA composite film as far as possible while staying within the visible light transmittance of the film. Around this point, we attempt to offer an idea for further studies. In this study, nano-SiO2 modified by a silane coupling agent was doped into EVA film with a fixed content of Eu3+ complex by the casting method. The experimental results show that when the modified SiO2 content is within 4%, the fluorescence of the EVA composite film gradually increases with increase in the modified SiO2 content and before formation of EVA composite film, the fluorescence intensities have no difference between the mixture with modified SiO2 and that without modified SiO2. SEM and AFM images of the EVA composite films show that the complex particles are probably enwrapped by aggregations of the modified SiO2 during the film-forming process, which strengthens the rigidity of the Eu3+ complex in the structure and results in the enhancement of fluorescence intensity. When the modified SiO2 content is within 2%, the visible light transmittance of the EVA film only slightly decreases. The photoelectric conversion efficiency of polycrystalline silicon solar cell coated with the composite film increases from 12.13% to 12.29%. Hence, the study provides a feasible approach to improve the LDS technique and has a potential application value.
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JOURNAL OF CRYSTAL GROWTH
·
2024
·
IF 1.7
Sibo Zhao,Dan Xiu,Min Zhang,Yao Wang,Miao Qiu,Christopher D. Snow,Yanxin Wang,Laurence A. Belfiore,Jianguo Tang
In this study, a highly sensitive anticancer drug sensor was synthesized using DNA crystals loaded with luminescent Ln 3+ (Eu 3+ /Tb 3+ ) complexes. The sensors exhibited a pronounced color transformation property due to the differential quenching of Eu 3+ and Tb 3+ emissions upon drug interactions. These luminescent hybrid DNA crystals present a significant advancement in sensing anticancer drugs like curcumin, transitioning from monitoring fluorescence intensity changes to a visually discernable color change. This new approach eliminates the need for specialized instrumentation. Owing to the intrinsic biocompatibility of materials composed of DNA, this hybrid sensor has the potential to sense drugs within the human body. Hybrid crystals loaded with a single complex will lose their fluorescence properties due to drug quenching; however, crystals loaded with mixed complexes emit distinct fluorescent colors, such as yellow-green and orange-red, at different drug concentrations. This color transformation allows for the direct determination of drug concentration based on crystal color, making the sensing process more simple and easily observable.
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高影响因子
OPTICAL MATERIALS
·
2020
·
IF 2.779
Yicheng Zeng,Biwei Qiu,FangFang Wang,Lei Zhou,Ying Li
Two kinds of hybrid luminescence films ([C 8 VIM][Eu (nta) 4 ]@PMMA and [C 8 VIM][Tb (acac) 4 ]@PMMA) have been synthesized by the copolymerization of MMA with lanthanide functionalized ionic liquid [C 8 VIM][Eu (nta) 4 ]. The structure and composition of the as-synthesized films have been characterized by 1 HNMR, XPS , FTIR, UV–vis, XRD , TGA and SEM. In addition, the photophysical properties of as-synthesized films have been investigated in detail by luminescence spectroscopy. It was found that the transparent and thermal stability of as-synthesized films are improved by the long chains of PMMA . More significantly, [C 8 VIM][Eu (nta) 4 ] @PMMA exhibits the improvement of photo physical properties (ƞ = 52.6%) and is selected as the representative sample to examine the potential fluorescence sensing of metal ions and anions. It has been showed highly selective and sensitive fluorescence sensing for Cu 2+ and CrO 4 2− . Meanwhile, [C 8 VIM][Eu (nta) 4 ]@PMMA exhibits a good stability in the aqueous solution, which is further used as fluorescence probe for detecting CO 3 2− . The good stability, sensitive fluorescence response and good mechanical processing properties of [C 8 VIM][Eu (nta) 4 ]@PMMA show a great potential to establish a fast response anion and cationic of aqueous solution fluorescence colorimetric sensor devices.
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高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 22
·7397-7405
·
IF 4.174
Jie Chen,Yixin Gao,Haifeng Jiang,Yan Liu,Zhaohui Jin
Optimizing structure and varying doped ions are two main strategies to obtain excellent luminescence performance. Spherical morphology is considered to be the most ideal phosphor structure due to the least surface defects. Herein, a series of spherical and monodispersed Dy3+/Eu3+ co-activated SiO2@Gd2O3 core–shell phosphors with multicolor tunable luminescence were successfully prepared via a facile urea assisted precipitation method. Related chemical reactions and the possible growth mechanism of Gd2O3:Ln3+ directional deposition on the surface of SiO2 microspheres were put forward. Upon 273 nm UV radiation excitation, SiO2@Gd2O3:Dy3+ and SiO2@Gd2O3:Eu3+ samples exhibited characteristic yellow (4F9/2–6H13/2) and blue (4F9/2–6H15/2) emissions of Dy3+ and red (5D0–7F2) emission of Eu3+, respectively. Meanwhile, multicolor emissions (warm white, yellow and orange) could be easily obtained by modulating the relative content of Dy3+ and Eu3+ in SiO2@Gd2O3:Ln3+ samples under a single excitation wavelength. Moreover, it was confirmed that Dy3+ could transfer energy to Eu3+ in the form of quadrupole–quadrupole interaction and further improved the luminescence intensity of Eu3+ by comparing experimental data with theoretical calculations. These results imply that tunable luminescence Dy3+,Eu3+ co-doped SiO2@Gd2O3 microspheres have great potential applications in multicolor displays and biolabeling fields.
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高影响因子
Solar RRL
·
2023
·Vol. 7
·期 12
·2300215
·
IF 7.9
Siwei Gu,Zheng Lu,Shuai Zou,Chengkun Wu,Chen-wei Peng,Mengfei Ni,Zhenzhen Chen,Hao Huang,Hua Sun,Haibo Wang,Xiaohong Zhang,Xiaodong Su
Herein, a solid strategy to prepare bifunctional SiO 2 coatings (BSCs) with both antireflection and luminescence downshifting properties by in situ generating YVO 4 :Eu 3+ ,Bi 3+ phosphors in SiO 2 antireflection coatings (ARCs) is reported. Namely, a self-prepared precursor solution of the downshifting phosphors is added to a mixture of commercial SiO 2 sol solution and ethanol to uniformly coat the surface of quartz glass; therefore, a novel composite porous SiO 2 coating containing in situ generated YVO 4 :Eu 3+ ,Bi 3+ phosphors (labeled SiO 2 @YVO 4 :Eu 3+ ,Bi 3+ coating) is formed on the glass surface after annealing. The SiO 2 @YVO 4 :Eu 3+ ,Bi 3+ BSCs can effectively convert ultraviolet (UV) region photons to visible photons that are well absorbed by silicon solar cells and have better transmittance than pure SiO 2 ARC. As proof-of-concept applications, the as-prepared optimal SiO 2 @YVO 4 :Eu 3+ ,Bi 3+ coating can effectively improve the photoelectric conversion efficiency (PCE) of tunnel oxide passivated contact solar cells by 0.18%abs and decrease the UV-induced degradation value of the PCE of silicon heterojunction solar cells by 0.62%abs compared to the pure SiO 2 ARC. The results demonstrate that in situ generating luminescence downshifting phosphors in the SiO 2 ARC of photovoltaic glass is a promising way to improve the PCE and UV stability of silicon solar cells.
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高影响因子
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