NANO
·
2014
·
IF 1.26
HUI LI,CHUANXI WANG,YINGNAN JIANG,ZHANCHEN CUI,QUAN LIN
Lanthanide-doped luminescent nanoscale materials have great potential applications in biological researches. Herein, we reported a novel and mild method for one-step synthesis of chitosan/ NaGdF 4 : Eu 3+ nanocomposites. The luminescent Eu 3+ ions and magnetic resonance imaging (MRI) contrast agent Gd 3+ ions were incorporated to these biocompatible nanocomposites. The resultant nanocomposites exhibited strong fluorescence and attractive magnetic features. The nanocomposites also have pure hexagonal phase with uniform size of about 65 nm. FT-IR spectra revealed that these nanocomposites were successfully coated by hydrophilic chitosan, whose amine groups conferred the nanocomposites excellent dispensability in aqueous solution. Besides, the MTT assay and laser confocal microscopy images have confirmed the good biocompatibility of the nanocomposites. These results indicated that the as-prepared nanocomposites could be used as an excellent targeted imaging agent in biological fields.
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高影响因子
CRYSTENGCOMM
·
2013
·Vol. 15
·期 41
·8262-8272
·
IF 3.879
Qin Wang,Yunxia Liu,Baocang Liu,ZhanLi Chai,Guangran Xu,ShengLi Yu,Jun Zhang
Cubic α- and hexagonal β-phase lanthanide luminescent NaYF4:Eu3+/Tb3+ nanostructures with diverse morphologies were successfully synthesized via a mild solvothermal method. The effects of the synthetic parameters on the crystal phase structure, size and morphology of NaYF4:Eu3+/Tb3+ nanostructures were systematically investigated. By modifying the synthetic parameters, the crystal phase structure, size and morphology were well controlled, and the phase transition from cubic α- to hexagonal β- can be easily realized. Furthermore, the morphology evolution is revealed, and the surfactant modulating formation mechanisms with diverse morphologies was proposed. The photoluminescence properties were found to be in close correlation with their composition, phase structure and morphology. NaYF4:Eu3+/Tb3+ nanostructures possessing unique morphologies and highly efficient luminescence may find potential applications in optoelectronics, sensors and biolabels.
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高影响因子
Materials Research Express
·
2015
·Vol. 2
·期 12
·125901
·
IF 0
Na Wu,Qun Luo,Xvsheng Qiao,Chang-Qi Ma
Recently, spectra conversion has been used to minimize energy loss in photovoltaic devices. In this work, we explore the development of a novel Eu3+-doped ZnO bi-functional layer for use in organic solar cells. The bi-functional layer acts as both a spectra conversion and an electron transporting layer. Compared to conventional spectra conversion layers, it has a simpler device structure, is easier to fabricate, and has a wider spectrum-sensitized region. A series of Eu3+-doped ZnO nanocrystals were synthesized using the simple solution route. X-ray powder diffraction patterns (XRD), transmission electron microscopy (TEM), and UV-visible absorbance spectra were used to characterize the obtained ZnO nanocrystals. The results reveal that the size and bandgap of ZnO nanocrystals can be controlled through regulation of the doping concentration of Eu3+ ions. The energy transfer of ZnO → Eu3+ is observed by photoluminescence (PL) spectra. At a bandgap excitation of around 300–400 nm, a typical emission band from the Eu3+ is obtained. By employing the Eu3+- doped ZnO nanocrystals as a buffer layer in a P3HT:PC61BM bulk heterojunction device, the obtained performance is similar to the undoped ZnO device, indicating that the electrical properties of ZnO are not affected by Eu3+ doping. Due to the down-conversion energy transfer between ZnO and Eu3+, the external quantum efficiency of the ZnO:Eu3+ device at 300–400 nm is higher than that of the pure ZnO device, which subsequently leads to an increase in short circuit current density (JSC). This work proves that it is possible to improve the solar spectrum response in the ultraviolet region of organic solar cells effectively by incorporating the bi-functional layer.
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JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2024
·
IF 3.2
Zhichao Jin,Zhongli Zhu
A series of SiO 2 -B 2 O 3 -ZnO-La 2 O 3 -BaO (SBZLBa) glasses doped with Dy 3+ and Eu 3+ were synthesized using the melt-quenching technique. Their optical characteristics and potential applications in W-LED devices were investigated. The structural effects resulting from doping the glass with Dy 3+ and Eu 3+ ions were elucidated through infrared spectroscopy and an examination of the physical properties. The variations in emission intensity within the fluorescence spectrum validated the sensitizing effect of Dy 3+ on Eu 3+ within the glass matrix. By manipulating the transitions of both Dy 3+ and Eu 3+ , the excitation wavelength was altered, enabling the realization of cool white, neutral white, and warm white luminescence, thus accommodating the diverse requirements for white light emission in lighting applications. After incorporating 1.0 mol% of Dy 2 O 3 and 0.8 mol% of Eu 2 O 3 , respectively, the glass exhibited CIE coordinates of (0.3332, 0.3535), positioning it within the white light spectrum and in close proximity to the ideal white light coordinates of (0.33, 0.33). The SBZLBa-Dy 2 O 3 –0.8Eu 2 O 3 glass exhibited a quantum yield of 5.98 %. It has been demonstrated through acid and alkali resistance tests that this glass possesses excellent chemical stability. Additionally, temperature-dependent emission spectra have revealed that the luminous intensity of the glass maintains over 85 % of its room temperature value at 185 °C, with Eα determined to be 0.2387 eV.
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高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Lei Yanhua,Zhang Anlin,Li Dongdong,Li Feng,Sun Huapeng,Deng Bin
A series of newly synthesized red-emitting phosphors, La 3 Ga 5 SnO 14 :Eu 3+ , were produced through high-temperature solid-state synthesis methods. The phase purity, particle morphology and optical properties were systematically investigated in this work. The prepared fluorescent material has high phase purity. La 3 Ga 5 SnO 14 :Eu 3+ has a strong red emission peak at 612 nm at the excitation at 268 nm, which is caused by the radiative transitions of electrons ( 5 D 0 → 7 F 2 ). The optimal doping concentration of Eu 3+ was observed to be 30 mol% in this series of La 3 Ga 5 SnO 14 :Eu 3+ . The mechanism of concentration quenching was determined to be dipole-quadrupole interaction. The chromaticity coordinates of La 3 Ga 5 SnO 14 :30 mol%Eu 3+ were (0.648, 0.352) with a corresponding high color purity of 100%. The thermal stability of the phosphor was also characterized. The luminous intensity could be sustained at 54% at 480 K. The quantum efficiency of the La 3 Ga 5 SnO 14 :30 mol%Eu 3+ phosphor is 64.4%. The exhaustive findings from this study form the basis for advocating the application of these phosphors in light-emitting devices.
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PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Xuyan Xue,Sihan Yang,Weigang Liu,Liang Dong,Qi Zhu,Xuejiao Wang,Ji-Guang Li
Herein, we report a series of NaLaCaWO 6 : Bi 3+ , Eu 3+ double perovskite phosphors with a monoclinic crystal structure, achieving high-precision optical thermometry. Comprehensive characterisations, including X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, scanning electron microscopy and thermoluminescence, revealed detailed material properties. The electronic structure and formation energies of NaLaCaWO 6 : Bi 3+ , Eu 3+ were calculated using density functional theory (DFT), and the influence of luminescent centers (Bi 3+ and Eu 3+ ) on the optical properties was analyzed. The emission colour was tuned from green to red with increasing Eu 3+ , and efficient Bi 3+ → Eu 3+ energy transfer was achieved through dipole–dipole interaction, with an energy transfer efficiency of 59.4 %. In addition, the distinct temperature response characteristics of Bi 3+ and Eu 3+ fulfilled the prerequisites for efficient temperature signal resolution, demonstrating a high relative sensor sensitivity of 0.74 % K −1 (at 298 K) and minimal temperature resolution (δ T = 0.14 K) for the NaLaCaWO 6 : 0.05Bi 3+ , 0.01Eu 3+ . The moisture resistance of the phosphor was confirmed through a water immersion test, demonstrating excellent moisture resistance. These findings not only elucidate the photoluminescence behaviour of Bi 3+ and Eu 3+ in NaLaCaWO 6 but also highlights its promising application prospects in optical thermometry.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Liuhan Yi,Ruoyu Fu,Feng Zhang,Zheng Wei,Man Zhang
The anomalous luminescence thermal quenching performance caused by negative thermal expansion has attracted much attention due to the potential application in optical fields . However, the downshifting emissions with abnormal thermal quenching achieved by isotropic negative thermal expansion for optical temperature sensing applications are still lacking. Herein, a large enhancement of red emission and a high temperature sensing performance are realized by isotropic negative thermal expansion in ScF 3 :Tb 3+ /Eu 3+ phosphors ceramics. Specially, a selectively thermal enhanced red emission of Eu 3+ from 5 D 0 → 7 F 2 with hypersensitive transition characteristics could be obtained due to the thermal stimulated lattice distortion . Attributing to the shortening of cation spacing, the energy transfer efficiency between Tb 3+ and Eu 3+ is largely enhanced with the increasing of the temperature from 303 to 473 K. The enhanced energy transfer leads to that the emission of Tb 3+ firstly increases and then slightly decreases, whereas the emission from Eu 3+ has been largely improved. Finally, an optical temperature sensing strategy based on the fluorescence intensity ratio of the sensitizer Tb 3+ (signal ions) and the activator Eu 3+ (referring ions) is designed, attributing to the distinguishable luminescence response to the temperature. The obtained maximum relative sensitivity is 1.04 % K −1 (@303 K). Besides, the sensing strategy based on lifetime mode also suggests a maximum relative sensitivity of 1.00 % K −1 at 343 K. It provides a feasible strategy to obtain an optical temperature sensing material with high emission efficiency at a high temperature, which sheds light on the design of luminescence materials keeping high luminescence stability in a wide temperature range in the fields of optical temperature sensing.
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ying Li,Yong Hong Ma,Aihua Mao,Xiwei Qi
A series of transparent (1- y )La 2 O 3 –Ga 2 O 3 - y Sm 2 O 3 - x Eu 2 O 3 (where x = 0, 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.14, and y = 0, 0.04) were successfully synthesized using a containerless solidification process. Co-doping with Sm 3+ and Eu 3+ enhanced the energy absorption of Eu 3+ , notably improving the characteristic emission peak 5 D 0 - 7 F 2 of Eu 3+ . The peak emission intensity for y = 0.04 was observed at x = 0.08, attributable to the concentration quenching of Eu 3+ ions. As the concentration of Eu 3+ increased, the energy transfer effect on emission intensity diminished. Attributed to the energy transfer between Sm 3+ and Eu 3+ , Sm 3+ may primarily serve as the sensitizer, and Eu 3+ as the activator. According to the Dexter theory, which suggests that the interaction between activator ions and their adjacent ions is the primary mechanism of energy transfer and quenching among Eu 3+ ions and adjacent ions, an increase in Eu 3+ concentration leads to a decrease in the distance between Eu 3+ and adjacent ions, strengthening their interaction, and potentially inducing concentration quenching. Furthermore, with an increase in Eu 3+ concentration, the CIE chromaticity coordinates for the samples co-doped with Sm 3+ and Eu 3+ shifted significantly, enhancing the color purity of the emitted light and bringing it closer to the NTSC color standard coordinates (0.67, 0.33).
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高影响因子
Materials Advances
·
2021
·Vol. 2
·期 10
·3346-3352
·
IF 0
Ying Li,Dan Liu,Ya-Qi Wang,Fang-Fang Wang,Han-Xun Qiu
In this study, we developed a novel flexible method to construct a lanthanide dual-emitting ratiometric fluorescence nanoprobe with excellent luminescence properties and significant selectivity for the detection of copper ions, where the central Eu3+ ions are coordinated with 2,6-pyridinedicarboxylic acid (DPA) on the surface of CQDs. The structure and chemical sensing photoluminescence properties of the as-prepared fluorescent probe have been investigated in detail. Moreover, the results have shown that Eu-DPA–CQDs exhibit two fluorescence emissions at 450 nm and 613 nm, respectively, under an excitation wavelength of 285 nm. The responses of the two emissions towards Cu2+ ions are completely different and can provide references for each other. Therefore, it can be designed as a fluorescence sensor for the detection of Cu2+ ions. The emission spectrum at 613 nm is markedly quenched, while that at 450 nm slightly changed after the addition of Cu2+ ions. When the Cu2+ ion concentration was 0–150 μM, the FL ratio (IEu/ICQDs) showed a good linear relationship with the lowest detection limit (LOD) of 6 nM. Thus, the reported sensor has a high selectivity, satisfactory accuracy and precision, and it may provide the potential application in the biological and environmental fields.
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Materials Today Chemistry
·
2025
·
IF 6.7
Ying Wang,Zeyu Lyu,Pengcheng Luo,Zheng Lu,Dashuai Sun,Taixing Tan,Shuai Wei,Hongyang Zhang,Hanyu Hu,Hongpeng You
A series of solid-solution phosphors Ba 3 Sb 1- y Ta y Ga 3 Si 2 O 14 :Bi 3+ (0.0 ≤ y ≤ 1.0) were created using the high-temperature solid-state reaction. The crystal structure of Ba 3 Sb 1- y Ta y Ga 3 Si 2 O 14 belongs to trigonal crystal system with space group P321 (150) . The Rietveld refinements indicate that the Bi 3+ ions occupy the Ba 2+ sites. Ba 3 Sb 1- y Ta y Ga 3 Si 2 O 14 :0.03Bi 3+ has tunable luminescence property peaking from 531 to 492 nm as the Sb 5+ ions are gradually replaced by Ta 5+ ions, which are correlated with the crystal field strength variation causing by the substitution of Sb 5+ by Ta 5+ . The thermal stability of the emission at 423 K was improved from 5.4 to 49.9 %. When the obtained Ba 3 SbGa 3 Si 2 O 14 :0.03Bi 3+ /Ba 3 SbGa 3 Si 2 O 14 :0.03Bi 3+ ,0.015Eu 3+ was used as green light component, white LED devices were achieved with low CCT of 4613/4748 K and high Ra of 90.9/95.5. Moreover, multicolor luminescence was constructed by introducing red-emitting Eu³⁺ ions to create Ba 3 SbGa 3 Si 2 O 14 :0.03Bi 3+ ,0.015Eu 3+ and Ba 3 TaGa 3 Si 2 O 14 :0.03Bi 3+ ,0.015Eu 3+ phosphors. Under different excitation conditions, the multicolor emissions provide multi-modal and easily distinguishable anti-counterfeiting patterns. Our work demonstrates the feasible construct of tunable emission from Bi 3+ -doped solid-solution phosphors, providing a valuable candidate for diverse optical applications.
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高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 9
·期 16
·4022-4029
·
IF 7.779
Peng Zhang,Wanying Xie,Zhenbin Wang,Zenggang Lin,Xiuxiang Huang,Zhenghua Ju,Weisheng Liu
Long-persistent luminescence (PersL) materials have shown great promise on account of their diverse utilization in anticounterfeiting and encryption. Nevertheless, time-dependent dynamic multicolor afterglow is rarely reported, especially for single-component oxide-based materials. In this work, a series of LiGa5O8:Eu3+/Tb3+ phosphors exhibit time-dependent dynamic multicolor afterglow from blue to red or green over several seconds after ceasing the excitation. Both experimental and computational data confirm that the color evolution results from different energy transfer processes between traps and luminescent centers. The processes are probably controlled by thermally activated exciton diffusion and the electron tunneling effect. This dynamic multicolor afterglow of LiGa5O8 phosphors allows their applications in anticounterfeiting and encryption with high security levels.
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高影响因子
JAPANESE JOURNAL OF APPLIED PHYSICS
·
2022
·Vol. 61
·期 6
·062002
·
IF 1.491
Lei Wang,Subiyinuer Jilili,Ayinuremu Tuerxun,Aierken Sidike,Qingling Wang
A series of Tb3+, Eu3+, Li+ co-doped SrSiO3 phosphors were prepared using the high-temperature solid-phase method. The X-ray diffraction results showed that Tb3+ and Eu3+ successfully entered into the SrSiO3 matrix lattice. Strong energy transfer from Tb3+ to Eu3+ is exhibited with a calculated energy transfer efficiency of 94.7%. Doping of the charge compensator Li+ increased the luminescence intensity of the SrSiO3:6%Tb3+, 6%Eu3+, 3%Li+ phosphor at a wavelength of 614 nm by 4.2 times and significantly improved the color purity of this phosphor (Cp = 85.9%). Based on color coordinate analysis, the phosphor color coordinates are located near (0.615, 0.365), which belongs to the red region. The phosphor was integrated into a white LED. The resultant package exhibited a color temperature of 6479 K and a color rendering index of 93.8. Its luminous performance was also very stable under different drive currents.
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高影响因子
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