SOLAR ENERGY
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2022
·
IF 7.188
Wenhu Zhang,Pin Lv,Yujiao Li,Yangqing Wu,Jia Dong,Wenzhi Wang,Hairui Sun,Bingqiang Cao
Hole transport layer free perovskite solar cells (HTL-Free PSCs) have attracted extensive attention due to their advantages of simple structure and low cost. However, due to the serious energy level mismatch caused by the direct contact between the perovskite layer and the opposite electrode, the space for improving the efficiency of HTL-Free PSCs is greatly limited. We use Eu 3+ doped CsPbBr 3 quantum dots (QD) to modify the interface between MAPbI 3 :Na layer and C electrode, and study its effect on the surface defect passivation, interface energy level arrangement and carrier transport behavior in the device. It was found that compared with the interfacial modification of CsPbBr 3 QD alone, the interfacial modification of CsPbBr 3 :Eu QD could effectively solve the problem of energy level mismatch in HTL-Free PSCs, resulting in a remarkable improvement of conversion efficiency from 9.01 % to 12.95 %. Furthermore, electron beam induced current (EBIC) was used to prove that CsPbBr 3 :Eu QD interface modification significantly improved the hole collection ability. This provides an experimental basis and theoretical guidance for the optimization of the efficiency of other types of transport layer free photovoltaic devices.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Jin Liu,Yaowei Guo,Yupeng Bi,Yao Wang,Yanxin Wang,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
Reversible bright-dark luminescence nanomaterials have been developed for information storage and anti-counterfeiting in recent years, however, their monochrome characteristic and 2D patterning impose limits on the effective information storage density. In this work, a new strategy for producing ultraviolet switchable and stable luminescent patterns is proposed, based on Ln 3+ (Eu 3+ /Tb 3+ ) induced-polyelectrolyte aggregates (LIPAs) with sharp multi-color optical properties . Under 365 nm excitation, a multicolor pattern can be observed using both red and green, which is not visible when this excitation light source is off. The LIPAs enable the luminescent lanthanide complexes to be compatibilized with poly(lactic acid) (PLA). Functional anti-counterfeiting patterns were prepared by 3D printing using luminescent PLA containing by Ln 3+ (Eu 3+ /Tb 3+ ) LIPAs. Invisible, adjustable and ultra-stable multicolor luminescent patterns well enable information storage and enhance information security for anti-counterfeiting applications.
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Materials Today Chemistry
·
2022
·
IF 7.613
Peng Du,Jun Tang,Weiping Li,Laihui Luo,Marcin Runowski
Red-emitting phosphors play a vital role in reinforcing the quality of phosphor-converted white light-emitting diodes. Unfortunately, concentration quenching and unsatisfied thermal stability are still the inevitable shortcomings of the red-emitting phosphors. Herein, we utilized phase transition to simultaneously tailor the concentration quenching and thermal stability of Eu 3+ -activated NaYbF 4 (NaYbF 4 : x Eu 3+ ) nanoparticles , in order to overcome these limitations. With the increasing doping level, the resultant samples undergo a phase transition from cubic to hexagonal phase. Notably, the optimal doping content for Eu 3+ in the NaYbF 4 nanoparticles with cubic phase is 30 mol%. However, when the phase transition occurs, the concentration quenching takes place at a much higher doping concentration, i.e. the optimum content of Eu 3+ in the structure is increased to about 80 mol%. Moreover, with elevating the Eu 3+ content, the local coordination environment of Eu 3+ in the NaYbF 4 host lattice is changed from inversion (centrosymmetric) to non-inversion symmetry (non-centrosymmetric), which is further confirmed by the theoretical calculation results via Judd-Oflet theory. Furthermore, compared with cubic samples, the hexagonal NaYbF 4 :0.8Eu 3+ nanoparticles show improved thermal stability. Importantly, utilizing hexagonal NaYbF 4 :0.8Eu 3+ nanoparticles, a designed white light-emitting diode emits warm white light, with desired color coordinates (0.398,0.374), high color rendering index (86.3), and low correlated color temperature (3537 K). Besides, NaYbF 4 : x Eu 3+ nanoparticles and their flexible polydimethylsiloxane films exhibit potential applications in high-temperature optical anti-counterfeiting. This work may support a new perspective for tailoring the concentration quenching and thermal stability of various phosphors.
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Materials Today Chemistry
·
2021
·
IF 8.301
R.R. Yang,M. Li,Y.F. Zhao,P. Wang,S. Ye
Halogen vacancies are regarded to play a vital role in photo-induced phase segregation and the resulting switchable emission colors in the soft mixed-halide perovskites ; however, its control strategy via the balanced Pb 0 defects remains a big challenge. The research reports the regulation of synthesis and photochromic behavior via interfacial Eu 3+ /Eu 2+ -Pb 0 /Pb 2+ redox in composites of porous Ca 0.9 Eu 0.1 MoO 4 and nominal mixed-halide perovskite CsPbCl 1.5 Br 1.5 . The composite takes full advantage of Eu 3+ ions with the concerns of its luminescence and variable valences. It provides an additional emission color besides the halide perovskite, manipulates the Pb 0 defects and the resulting Br-rich domain via interfacial redox reaction in the composites. The more contents of surfaced Eu 3+ caused by substituting the unequivalent Ca 2+ ions and the high volume-to-surface ratio of the porous Ca 0.9 Eu 0.1 MoO 4 guarantees the interfacial access for the Eu 3+ and the halides. The research provides some perspectives on the regulation of ionic valence and photoluminescence of halide perovskites with the use of lanthanide ions. The composites may find potential applications in the anti-counterfeiting field.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
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IF 5.2
Herui Zhao,Yanjie Zhang,Shiwei Yang,Chunwen Ye,Cong He,Yaqi Song,Yuxin Wang,Bojun Lin,Jingjie Yu
Dy 3+ and Eu 3+ co-doped phosphors have been emerged as potential candidate to generate high-quality white light under the ultraviolet (UV) or near ultraviolet (NUV) excitation for health and comfort lighting. Herein, K 2 Lu(WO 4 )(PO 4 ) crystal has been newly developed to accommodate rare earth ions, such as Dy 3+ and Eu 3+ ions, to achieve spectral tunability of high-quality white light. Under NUV excitation, Dy 3+ singly-doped K 2 Lu(WO 4 )(PO 4 ) phosphors exhibit the desired blue emission at 486 nm and yellow emission at 575 nm, attributed to the electric dipole transition 4 F 9/2 → 6 H 15/2 and the magnetic dipole transition 4 F 9/2 → 6 H 13/2 transitions of Dy 3+ ions, respectively. Interestingly, the emission color can be facilely adjusted from cold white light to pink light under 365 nm NUV excitation due to the co-doping of Eu 3+ ions in K 2 Lu(WO 4 )(PO 4 ): 0.05Dy 3+ sample. Further, the remote luminescent layers containing K 2 Lu(WO 4 )(PO 4 ): 0.05Dy 3+ , 0.20Eu 3+ phosphor can be printed on glass substrate by screen printing technique to generate high-quality white light with the correlated color temperature (CCT) of 5433 K and color rendering index (CRI) of 87. Moreover, the remote luminescent layers exhibit better heat dissipation performance compared to conventional encapsulated LEDs and can be used as a multicolor emitting candidate for high-power white LEDs.
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POLYMER COMPOSITES
·
2023
·
IF 5.2
Yao Peng,Yao Wang,Yingdi Dan,Zengkun Li,Quankai Sun,Yanxin Wang,Wei Wang,Zhonglin Du,Linjun Huang,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
In this work, innovative hybrid poly(ethylene terephthalate) (PET) materials with strong luminescence were successfully synthesized by doping PET with silicon-linked poly(ethylene glycol)-PET copolymer nanostructures either with (Si-PEG-PET) or with (ETP@Si-PEG-PET) luminescent Eu 3+ -complexes. The chemical properties and nanostructures of the hybrid materials were characterized by Fourier-transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, x-ray photoelectron spectroscopy, and high-resolution transmission electron microscopy. PET composites ranging from 0.25 to 4 wt% silicon additive were prepared by the melt blending method. The crystal properties, mechanical properties, and fluorescence properties of the composites were systematically studied by differential scanning calorimetry, x-ray diffractometry, tensile testing, and fluorescence spectrometry. When the addition of Si-PEG-PET or ETP@Si-PEG-PET was 0.75 wt%, the relative crystallinity and maximum tensile strength increase substantially. Moreover, the fluorescence intensity of hybrid luminescent PET materials is the strongest at 0.75 wt% loading. ETP@Si-PEG-PET not only endows PET polyester with stronger fluorescence properties and mechanical properties but also acts as an effective nucleation additive for PET. Highlights Silicon-linked poly(ethylene glycol)-poly(ethylene terephthalate) (PEG-PET) nanostructures generate hybrid luminescent PET materials. ETP@Si-PEG-PET improves the crystallization rate and crystallinity of PET. The composite with 0.75% addition showed the best fluorescence performance. Three-dimensional-grid structure of ETP@Si-PEG-PET enhances the mechanical property of PET.
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MATERIALS & DESIGN
·
2021
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IF 7.991
Xiaozhen Wang,Yanxin Wang,Linjun Huang,Bingyang Li,Xianhang Yan,Zhenzhen Huang,Yao Wang,Matt J. Kipper,Jianguo Tang
Trace amounts of heavy metal ions in the human body are essential for maintaining health. However, heavy metal ion excess or deficiency causes toxicity or disease. This study examines the sensitivity of luminescent europium complexes for the detection of Cu 2+ . Here, Eu 3+ is complexed with1,10-phenanthroline (phen) and 4,4′,4-trimethyltriphenylamine (TTA) to form luminescent [Eu 3+ (TTA) 3 phen] complexes, encapsulated in silica (SiO 2 ) nanoparticles. The silica nanoparticles are then formed into a composite with a blend of chitosan and polyethylene oxide (PEO), to make electrospun nanofibers. The combination of Eu 3+ complexes with SiO 2 nanoparticles doped in chitosan enhances the fluorescence performance. Photophysical measurements show that when the Cu 2+ concentration is 100 μmol/L, the fluorescence of the composite chitosan nanofibers can be quickly and sensitively quenched, and that concentrations as low as 10 μmol/L Cu 2+ can be detected. Furthermore, the use of chitosan and PEO to prepare the material makes these new fluorescence-based copper sensing materials suitable for Cu 2+ detection in biological systems.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 2
·886-895
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IF 3.502
Xiaoping Guo,Qiwen Pan,Xiaoqian Song,Qianyi Guo,Shangxiong Zhou,Jianrong Qiu,Guoping Dong
Fluorescent detection is a new spectroscopic measurement for ions sensing due to the advantages of real-time determination with high selectivity, accuracy, and low cost. However, chemosensors based on fluorescent detection are usually determined by absolute intensity from a monochromatic emission signal, which is easy to be fluctuated by the external environment, especially for Fe 3+ detection in complex fluids. Herein, we rationally design a dual-emission Eu 3+ : CDs@ZIF-8 to construct a ratiometric fluorescent sensor with self-calibrating ability for Fe 3+ determination. High efficient carbon dots (CDs) are embedded in europium ions (Eu 3+ )-doped MOF by simple stirring preparation at room temperature. The label-free ratiometric fluorescent probe (I CDs@ZIF-8 /I Eu ) exhibits simultaneous blue and red emission under the same excitation at 365 nm. Remarkably, Eu 3+ : CDs@ZIF-8 displays the superiority of high selectivity to Fe 3+ , which shows ratiometric fluorescence characteristics (I 0 /I) in a range of 0-6 μmol\L with a low limit of detection (LOD) of 0.897 μmol\L. Besides, the CDs-MOF nanocomposite holds good aqueous dispersibility and low cytotoxicity, which shows great potential applications in medical aid including biological detection and clinical diagnosis.
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DYES AND PIGMENTS
·
2020
·
IF 4.613
Jing Wang,Jing Wang,Jin Liu,Xinzhi Wang,Abdur Raheem Aleem,Zhengxing Song,Matt J. Kipper,Jianguo Tang
Novel non-toxic Eu 3+ -induced polyelectrolyte nano-aggregates (EIPAs) are used as a light-emitting nanomaterial to sense bacteria on the surface of cotton fabric. EIPAs are formed through coordination interaction between Eu 3+ (tta) 3 phen complexes with positive charges and polyanionic hyaluronic acid (HA) with negative charges, and EIPAs were chemically bonded onto cotton fabrics through pentaerythritol (PER) crosslinking. Based on this innovation, the obtained fluorescence cotton fabrics (FCF) have a wide excitation spectrum , intense emission spectrum, and long fluorescence lifetime , which makes the fabric fluorescence stable and bright. These EIPAs and their photophysical properties impart FCF with the ability to report both Staphylococcus aureus and Escherichia coli . Furthermore, FCF has antibacterial activity against Staphylococcus aureus . Therefore, this new FCF integrates the advantages of superior lanthanide fluorescence, non-cytotoxicity, antibacterial activity, wearable and smart sensing.
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Journal of Materials Chemistry C
·
2020
·Vol. 8
·期 13
·4518-4533
·
IF 7.059
Guo-Hui Pan,Liangliang Zhang,Huajun Wu,Xuesong Qu,Hao Wu,Zhendong Hao,Ligong Zhang,Xia Zhang,Jiahua Zhang
Monoclinic ZrO2 (m-ZrO2) is an attractive material for photonic applications due to its low site symmetry and phonon energy. In this paper, we present detailed studies on the luminescence properties of Ti4+ and Eu3+ in m-ZrO2. In view of the continuing controversy over the origin of “intrinsic” white-blue luminescence in pristine m-ZrO2, more spectroscopic information obtained by characterizing m-ZrO2 intentionally doped with Ti4+, Ti3+ and other metal ions and extensive discussions on the general characteristics of different luminescence processes were provided to evidence the luminescence as the Ti3+ → O− charge transfer transition in the [Ti(IV)O7]10− complex due to the trace amount of Ti4+ impurity in ZrO2 reagent. Competitive absorption was observed between host exciton and oxygen–metal charge transfer processes (O2−–Ti4+, O2−–Eu3+), and even between the two types of charge transfer process because of the sharing of electrons at the top of the valence band, which greatly influenced the absorption and excitation processes. The spectral components comprising the broad excitation band of O2−–Ti4+ white-blue or Eu3+ red emissions in different phosphors were identified, and their evolutions with doping concentration were explained. The energy state locations of oxygen defects produced by intrinsic charge compensation in m-ZrO2:Eu3+ were proposed to be ∼2.41 eV above the top of the valence band by using Eu3+ for the luminescent probe. Efficient energy transfer from the [Ti(IV)O7]10− complex to Eu3+ was first observed in m-ZrO2:Ti4+,Eu3+ phosphors, which were demonstrated to be high performance ratiometric self-referencing optical thermometric materials based on the dual-emitting combination strategy, with the relative sensitivity amounting to ∼3.84% K−1. Optical thermometry not only covering the physiological temperature range but also with high relative sensitivity could be achieved upon appropriate doping.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Kuiyu Yi,Xiaoting Zhang,Lei Zhang
Anthrax spores pose a serious threat to human well-being and life, so it is highly desirable to develop a rapid, sensitive, and selective quantitative assay of calcium pyridine dicarboxylate (CaDPA) as a biomarker of anthrax spores. Herein, carbon dots (CDs) chelated Eu 3+ @metal–organic framework (Eu-MOFs) as dual-emissive ratiometric fluorescent (RF) probe was successfully fabricated by a simple one-pot in situ selective self-assembly synthetic strategy. The developed RF probe has an effective self-calibration function, which performs a highly sensitive and selective recognition of CaDPA in water and human serum sample. The blue-emitting CDs was employed as an effective fluorescence reference, while the Eu-MOFs exhibited enhanced red fluorescence signal through the coordination interaction with CaDPA chromophore . The sensing mechanism is attributed to that CaDPA can sensitize Eu 3+ intrinsic luminescence due to the energy transfer from CaDPA to Eu 3+ . What's more interesting is that with the continuous drop of CaDPA, the emission color of CDs@Eu-MOF changes from blue to red. The results revealed that CDs@Eu-MOFs RF probe can detect CaDPA effectively in the range of 8–170 μg/L with good linear relationship, and exhibited a remarkable selectivity for CaDPA. More interestingly, a paper-based probe has also been devised for on-site detection of CaDPA. In addition, CaDPA is used as input signal to construct an IHIBITION logic gate device which performs the “off-on” mode. The constructed CDs@Eu-MOF probe can achieve exceptionally rapid, highly sensitive and selective detection of CaDPA, which can further expand the application prospects in environmental and biological analysis.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 3
·2699-2707
·
IF 2.22
Zhang Jianxia,Li Haiying,Li Yu,Zhao Bing,Ju Xiangnan,Chen Wenbin,Lu Bingliang,Zeng Xiangan,Liu Li
This paper reports the preparation of an excellent acetone gas-sensitive material consisting of a Eu 3+ -decorated α-Fe 2 O 3 microflower (EFM) composite film by a simple hydrothermal and calcination method. For comparison, pure α-Fe 2 O 3 microflowers (PFM) are prepared with the same method. Scanning electron microscopy (SEM) images show that the samples are a loose 3D flower-like structure with many voids surrounded by many thin nanosheets. The structure of the samples was investigated using X-ray diffraction and X-ray photoelectron spectroscopy (XPS). The PFM and EFM gas sensors were systematically tested for gas sensitivity at an optimum temperature of 145 °C. The sensitivity of the EFM gas sensor with 50 ppm of acetone gas was 83, which was up to four times that of the PFM sensitivity (19). The EFM sensor had an extremely fast response time (4 s) and recovery time (38 s). Moreover, the minimum concentration of acetone that we could detect was 0.1 ppm with a response value of 2.1. The enhancement of gas sensitivity was attributed to the high catalytic activity of the Eu 3+ additive.
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危险品化学品经营许可证（带存储）