Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 26
·6764-6770
·
IF 4.696
Li Ma,Weidong Xiang,Haihong Gao,Lang Pei,Xin Ma,Yunyun Huang,Xiaojuan Liang
Carbon dot (CD)-doped sodium borosilicate gel (CD-NBS gel) glasses were successfully prepared by incorporating the CDs into sodium borosilicate networks. The structural and luminescence properties of highly flexible CD-NBS gel glasses with 5% wt% to 70 wt% CDs were studied. Images of the CD-NBS gel glasses captured using a transmission electron microscope demonstrated the uniformity and good dispersibility of the glasses. Red-shifted emission and enhanced quantum efficiency were observed when the doping concentration of CDs in the NBS gel glasses increased. The enhanced fluorescence properties of the CD-NBS gel glasses were considered to originate from the surface modification of CDs with high dopant concentration in the gel glasses. CD-based white light-emitting diodes (W-LEDs) were developed by combining the yellow light-emitting CD-NBS gel glasses with blue GaN-based LED chips. The as-fabricated W-LEDs exhibited the optimised colour coordinates of (0.32, 0.33), the colour rendering index up to 78.9, and the maximum luminous efficacy exceeding 58.1 lm W−1 by the use of the CD-NBS gel glasses at different concentrations of CDs. These results indicate that this new kind of CD-NBS gel glass would be a promising candidate for W-LEDs.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Siping Wang,Zhaoyang Chen,Shala Bi,Zuyang Gao,Houjin Hu,Yi Liu,Bolong Zhang
Developing luminescent materials with lower cost and higher temperature sensitivity can provide more options for achieving precise optical thermometry. Therefore, the Tb 4 O 7 and Eu 2 O 3 co-doped BaO-ZnO-P 2 O 5 -B 2 O 3 glasses for optical thermometry were designed and synthesized using a high-temperature melting and quenching method. Due to the low optical basicity and the formation of defects of the glasses, the coexistence of Eu 2+ and Eu 3+ ions was achieved without the reducing agent. In Eu 2 O 3 doped glasses, the relative content variation of Eu 2+ and Eu 3+ ions was analyzed using high-resolution X-ray photoelectron spectroscopy. Emission spectra and fluorescence lifetimes confirmed the effective energy transfer processes between Eu 2+ and Tb 3+ or Tb 3+ and Eu 3+ , which play critical roles in the tunable white emission properties of the material. In the temperature-dependent fluorescence spectra, Eu 2+ ions exhibit significant thermal quenching behavior, which is key to achieving higher temperature sensitivity in optical thermometry. The Eu 2+ /Tb 3+ /Eu 3+ co-doped glasses were investigated for their optical temperature sensing behavior, utilizing the fluorescence intensity ratio techniques, within the temperature range of 273 K–498 K. The maximum absolute (at 498 K) and relative (at 273 K) sensitivity based on the fluorescence intensity ratio, were observed for Eu 2+ /Eu 3+ pairs were 0.145 K −1 and 1.46 % K −1 , respectively, outperforming the conventional Tb 3+ /Eu 3+ combination. Additionally, no significant fluctuation occurred during the repeated experiment. This work demonstrates that Eu 2+ /Tb 3+ /Eu 3+ co-doped BaO-ZnO-P 2 O 5 -B 2 O 3 glasses could be considered a promising candidate for optical thermometry.
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JOURNAL OF APPLIED PHYSICS
·
2021
·Vol. 129
·期 5
·
IF 2.546
Jiao Yan,Guo Mengting,Wang Renle,Shao Chongyun,Hu Lili
In this study, Er 3+ /Al 3+ co-doped silica glasses with various Al/Er ratios ranging from 0 to 200 and a constant Er 2 O 3 amount were prepared using the sol-gel method combined with high-temperature vacuum sintering. The absorption, emission spectra, and fluorescence lifetime of Er 3+ ions were recorded and the absorption and emission cross sections were calculated. Using Raman, 27 Al and 29 Si magic angle spinning nuclear magnetic resonance (MAS-NMR), 27 Al triple-quantum (TQ)-MAS-NMR, and electron paramagnetic resonance (EPR) spectroscopies, the physical and optical properties were correlated with the glass structural modifications due to the Al/Er ratio change. With the increase in the Al/Er ratio, the content of Al 3+ ions around the Er 3+ ions gradually increased. Meanwhile, the AlO 5 and AlO 6 polyhedrons increased at the expense of the AlO 4 and SiO 4 tetrahedrons, which resulted in an improved symmetry and better ionic Er–O bonds. These structural changes led to the site-to-site variations in the Er 3+ local environment and the changes in the ligand field strength of the Er–O bonds. This, in turn, resulted in the inhomogeneous broadening of the absorption and emission spectra, with a blue shift of both absorption and emission peaks and a decrease in both absorption and emission at 1.53 μ m. With the increase in Al/Er ratio, the full width at half maximum (FWHM) of the emission increased from 27.2 to 54.3 nm. The FWHM × emission cross section ( σ e m i ) parameter for evaluating broadband amplification behavior was 30.1 × 10 −20 cm 2 · nm. This work reveals the close relationship between the glass structure and the spectroscopic properties of Er 3+ ions and provides an important reference for the design of broadband amplifier materials in the field of optical communication.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Ping Chen,Nengli Dai
Detection of Fe 3+ ions is of paramount importance for environmental protection and human health. Herein, we reported a highly selective and sensitive fluorescence probe for the quantification of Fe 3+ ions in aqueous solution with Eu 3+ /SnO 2 nanocrystals co-doped silica glasses as the sensing unit. Due to the high stability of silica glasses and their efficient protection for emitting centers, the probe has good recyclability and can be applied in real water environment, indicating its potential for on-site sensing. The detection limit of Fe 3+ ions is 7.54 nmol/L. Experiments were carried out to verify that the probe shows excellent cross interference with other metal ions. The detecting mechanism can be ascribed to the excitation/emission absorption and energy transfer of Fe 3+ ions. Our work paves a novel way of semiconductor oxide nanocrystals for applications in optoelectronics .
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-13
·
IF 16.6
Nie Fei,Wang Ke-Zhi,Yan Dongpeng
The fabrication of chiral molecules into macroscopic systems has many valuable applications, especially in the fields of optical displays, data encryption, information storage, and so on. Here, we design and prepare a serious of supramolecular glasses (SGs) based on Zn-L-Histidine complexes, via an evaporation-induced self-assembly (EISA) strategy. Metal-ligand interactions between the zinc(II) ion and chiral L-Histidine endow the SGs with interesting circularly polarized afterglow (CPA). Multicolored CPA emissions from blue to red with dissymmetry factor as high as 9.5 × 10 −3 and excited-state lifetime up to 356.7 ms are achieved under ambient conditions. Therefore, this work not only communicates the bulk SGs with wide-tunable afterglow and large circular polarization, but also provides an EISA method for the macroscopic self-assembly of chiral metal–organic hybrids toward photonic applications.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 2
·1-10
·
IF 2.8
Liu Longbin,Gao Wenkai,Kang Zeyu,Xi Chuying,Gao Shang,Tang Yu,Li Yongyan,Du Fengling,Yue Yunlong,Kang Junfeng
In this paper, alkali-free boroaluminosilicate glasses with low thermal expansion coefficient and low dielectric loss were prepared. The effect of Bi 2 O 3 substitution for CaO on structure, thermal expansion, elastic modulus, and dielectric properties of the samples was investigated by Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), thermal dilatometer, ultrasonic thickness gauge, and impedance analyzer. The results show that the polymerization degree of the glass network structure increases first and then decreases, which reaches the highest with the substitution of 0.5 mol% Bi 2 O 3 for CaO. The thermal expansion coefficient and dielectric constant decrease and then increase, while elastic modulus shows the opposite trend, which is attributed to the change in the glass network structure. The atomic mass of Bi much greater than that of Ca causes the obvious increase of glass density. The ionic radius of Bi 3+ ions is larger than that of Ca 2+ ions, making it more difficult to migrate through the glass network, reducing dielectric loss. In particular, the sample with 0.5 mol% Bi 2 O 3 substitution shows excellent properties, such as low thermal expansion coefficient (3.07 × 10 –6 /K), high elastic modulus (80.58 GPa), low dielectric constant (5.52), and dielectric loss (3.15 × 10 –3 ), which is very suitable for use as chip packaging material.
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MATERIALS LETTERS
·
2016
·
IF 2.437
Yudong Wang,Xiaofeng Chen
In this work, a facile synthesis was developed for fabrication of hollow mesoporous bioactive glasses (HMBGs) with tunable shell thickness and good monodispersity in a Hexadecyl trimethyl ammonium bromide (CTAB)-cyclohexane-ethanol -water oil-in-water (O/W) micro-emulsion system. The morphology, structure and particle size of HMBGs were investigated by various methods. The results demonstrated that the cyclohexane was added in the CTAB aqueous solution to form micro-emulsion droplets as template; CTAB acted as the surfactant of the micro-emulsion and the microstructural template of the HMBGs’ shell. The shell thickness of HMBGs could be tuned by adjusting the CTAB concentration. The unique structure and properties may make the HMBGs good candidates as drug or gene carriers for bone and dental tissue regeneration .
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RADIATION PHYSICS AND CHEMISTRY
·
2026
·
IF 3.5
A.G. Darwish,Abdullah Alsulami
Lithium sodium silicate glasses containing ZnO with nominal composition (25-x) Li 2 O- xZnO-10Na 2 O-65 SiO 2 (mol%) (Where x = 0, 5, 10, 15, 20 and 25 mol%) were effectively synthesized using the melt quenching method. The impact of ZnO/Li 2 O replacement on the glass structure, physico-mechanical and radiation shielding performance was evaluated. Results from various physical properties, such as molar volume Vm and oxygen packing density (OPD), are consistent with a progressive change in the glass network as Li 2 O is replaced by ZnO. These trends suggest a reduction in network cohesion, though this interpretation is based on calculated physical parameters. FTIR results are consistent with ZnO incorporation into the silicate network. Zn–O bonds have lower dissociation energy than Si–O bonds, and the calculated mechanical moduli decrease with increasing ZnO content, consistent with the expanding molar volume and declining atomic packing density observed across the series. Peak deconvolution of the FTIR spectra reveals a shift in the low-frequency band from 515 cm −1 in ASZ0 to 473 cm −1 in ASZ25, consistent with increasing Zn–O vibrational contributions with ZnO content. All shielding parameters were theoretically calculated and evaluated using Phy-X/PSD software in the energy range between 0.015 and 15 MeV, and the results indicate that adding ZnO at the expense of Li 2 O leads to an improvement in the calculated shielding efficiency of the prepared glasses. The calculated photon-shielding parameters indicate that adding ZnO at the expense of Li 2 O improves the attenuation performance of the prepared glasses across the studied energy range. Experimental validation through direct gamma-ray transmission measurements is recommended in future work.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Jie Wang,Xirong Huang,Yinfei Liu,Feifei Huang,Renguang Ye,Hongping Ma,Youjie Hua,Shiqing Xu
Plant photosynthesis relies on photosynthetic pigments to absorb red and far-red light. Cr 3+ -doped ZnAl 2 O 4 exhibits superior red-light emission, holding great potential for plant illumination. Nevertheless, the luminescence efficiency of nanocrystalline glass-ceramics is limited by their crystal size. To address this issue, in this study, Cr 3+ -doped micron-sized ZnAl 2 O 4 devitrified glasses were fabricated via a cooling-induced self-crystallization method. Cr 3+ incorporation simultaneously modulates the crystallization kinetics of the devitrified glasses and significantly enhances the luminescent properties. The maximum luminescence intensity was obtained at the Cr 3+ doping concentration of 0.1 mol%. Notably, the as-prepared devitrified glasses retain approximately 84% of its room-temperature photoluminescence intensity, even at an elevated temperature of 150 ℃. The emission peak of the ZnAl 2 O 4 : Cr 3+ devitrified glasses in the red spectral region closely matches the absorption spectrum of phytochrome far-red, effectively satisfying the red-light requirement for plant photosynthesis. Electroluminescence (EL) characterization confirms its suitability for plant lighting applications. This work is of great significance for promoting the development of the plant lighting industry.
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JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2026
·
IF 3.6
Long Yan,Yan Sun,Xin Wang,Chuncheng Zhang,Fangling Jiang,Ziwei Li,Ruilin Zheng,Shubin Chen,Lili Hu
Er 3+ -doped oxide glasses face severe concentration quenching at high doping levels, limiting their emission efficiency and laser performance. Here, a germanate glass system achieves ultrahigh Er 3+ doping concentration (11.91 × 10 20 cm −3 ) without significant quenching while enhancing thermal stability (ΔT = 242 °C). Under 980 nm excitation, the 2.7 μm emission exhibits nearly linear intensity growth (R 2 = 97.4%) and achieves a high gain coefficient of 5.75 cm −1 . Moreover, the up-conversion emission shows a tunable color from yellow-green to orange-red, achieving a maximum absolute temperature sensitivity of 3.352 × 10 −3 K −1 at 558 K. The local structure evolution of the Er 3+ and glass network was systematically investigated using Raman spectroscopy, Pair distribution function (PDF), and X-ray absorption fine structure (XAFS). This local structural engineering strategy not only provides a viable route for developing high-performance Er 3+ -doped germanate glasses but also broadens prospects for applications in high-power 2.7 μm fiber lasers and multifunctional optical sensors.
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JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Yaling Zhang,Lingcong Fan,Xuefeng Wang,Jiansheng Xie,Ying Shi
Rare earth doped 12CaO·7Al 2 O 3 (C12A7) glass-ceramics are one of attractive photonic materials due to their high transparency, high luminescent efficiency and eco-friendly nature. A series of C12A7 glasses with different Tb 3+ doping concentrations was prepared by aerodynamic levitation method. The C12A7:Tb glass-ceramics were obtained via in-situ growth from the glasses with the identical chemical composition at 800 °C. The microstructure observation demonstrates that the elemental distributions of Ca and Al are homogeneous in the glass-ceramics and the grain size of C12A7 is 4–70 nm. The in-line transmittance of glass-ceramics reaches as high as 82% at 1500 nm. The emission spectra of the C12A7:Tb glass-ceramics present characteristic Tb 3+ emission peaks at 486 nm ( 5 D 4 → 7 F 6 ), 541 nm ( 5 D 4 → 7 F 5 ), 585 nm ( 5 D 4 → 7 F 4 ) and 621 nm ( 5 D 4 → 7 F 3 ). The photoluminescence lifetime of C12A7:0.3%Tb glass-ceramic is 1.9 ms. Compared with the emission intensity of the glasses, that of the glass-ceramics increases due to the reducing in concentration of oxygen vacancy associated with network forming (NWF) cations. The highly transparent C12A7:Tb glass-ceramics may be a promising candidate for green light source in solid state lighting.
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Advanced Healthcare Materials
·
2023
·Vol. 12
·期 29
·2302073
·
IF 10
Shuangli Zhu,Maocai Li,Zetao Wang,Qi Feng,Huichang Gao,Qingtao Li,Xiaofeng Chen,Xiaodong Cao
The treatment for diabetic ulcers still remains a big clinic challenge owing to the adverse repair microenvironment. Bioactive glasses (BGs) play an important role in the late stages of healing due to their ability to promote vascularization and collagen fiber deposition, but fail to improve infection and oxidative stress in the early stage.Therefore, it is critical to develop a material involved in regulating the whole healing phases. In this work, BGs-based nanozymes (MnO 2 @PDA-BGs) with antioxidation, antibacterial and pro-healing abilities are synthesized by the redox deposition of MnO 2 on mesoporous BGs. Afterward, cryogel with the interconnected macropore structure is fabricated by the polymerization of methacrylate anhydride gelatin (GelMA) at −20 °C. MnO 2 @PDA-BGs are loaded into the cryogel to obtain nanocomposite cryogel (MnO 2 @PDA-BGs/Gel) with multiple enzymes-like- activities to eliminate reactive oxygen species (ROS). Besides, MnO 2 @PDA-BGs/Gel has intensive peroxidase-like activity under acidic condition and near infrared photothermal responsiveness to achieve excellent antibacterial performance. Cells experiments demonstrate that MnO 2 @PDA-BGs/Gel recruits L929s and promotes their proliferation. Furthermore, MnO 2 @PDA-BGs/Gel eliminates intracellular overexpressed ROS and maintains the viability of L929s. Animal experiments confirm that MnO 2 @PDA-BGs/Gel promotes wound healing and avoided scarring by killing bacteria, reversing inflammation, promoting vascularization, and improving the deposition of collagen III.
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