INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Zhihao Zhou,Puxian Xiong,Huailu Liu,Mingying Peng
Long persistent phosphors (LPPs) with ultraviolet (UV) luminescence have great potential for application in the fields of biomedicine, environmental, and catalysis. However, it is currently limited by the design and development of remarkable UV LPPs with a suitable spectral region and an ultralong afterglow decay time. Herein, we develop a new type of Bi3+-activated LiScGeO4 LPP, which exhibits bright ultraviolet-A (UVA) persistent luminescence (PersL). Because of the existence of numerous stabilized effective traps, the as-synthesized phosphors can undergo an ultralong PersL decay time far longer than 12 h. The PersL properties, effective trap depths, distributions, and types, as well as the possible mechanism for the PersL behavior of LiScGeO4:Bi3+, are comprehensively surveyed utilizing PersL excitation spectra, PersL decay analyses, thermoluminescence experiments, and X-ray photoelectron spectroscopy. This work can cover the shortage of LPPs in the UV region and also can lay the foundation for the development of more excellent UV LPPs toward versatile novel applications.
研究领域:
材料科学
·
生物医学
·
环境科学
·
催化领域
✓ 已验证
DOI
高影响因子
Journal of Advanced Dielectrics
·
2018
·
IF 0
Hua Fang,Gaojian Qiu,Xusheng Wang,Yanxia Li,Xi Yao
A series of Sr 1 . 9 6 Sn 1 − x Si x O 4 :0.04Sm 3 + ( x = 0 , 0.1, 0.15, 0.2, 0.3, 0.4) were synthesized from solid-state reaction. The mechanoluminescence (ML) performance of Sr 1 . 9 6 SnO 4 :0.04Sm 3 + was greatly enhanced by partial Si 4 + substitution for Sn 4 + , and the sample of Sr 1 . 9 6 Sn 0 . 8 Si 0 . 2 O 4 :0.04Sm 3 + showed weaker afterglow and twice stronger ML intensity than that in Sr 1 . 9 6 SnO 4 :0.04Sm 3 + . The stress response of Sr 1 . 9 6 Sn 0 . 8 Si 0 . 2 O 4 :0.04Sm 3 + ranged from 250 to 1200 N, and its linearity was greatly restored. Particularly, it was very sensitive in the minimal stress response range. These properties of no load threshold for stress sensing and weak afterglow make Sr 1 . 9 6 Sn 0 . 8 Si 0 . 2 O 4 :0.04Sm 3 + superior to other excellent ML materials. The introduction of Si 4 + caused lattice distortion and promoted defect formation in the system. The trap level energy greatly increased and the trap depth changed, which enhanced the trap ability and therefore improved effectively the ML properties.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
POLYMER BULLETIN
·
2020
·Vol. 78
·期 10
·5891-5903
·
IF 2.014
khan Muhammad Zeeshan,Wang Feipeng,Waleed Aashir,Huang Zhengyong,Hassan Muhammad Arshad Shehzad,Khan Asim
In this work, epoxy resin samples incorporated with nano-Al 2 O 3 of various concentrations 0, 1, 3 and 5 wt% were prepared. Surface treatment of nano-Al 2 O 3 was performed by the saline coupling agent of γ-aminopropyltriethoxysilane (KH550) to restrict the aggregation. The thermal gravimetric analysis (TGA) of the epoxy resin/Al 2 O 3 nanocomposites was observed at different filler concentrations. TGA analysis indicated that incorporation of nano-Al 2 O 3 increases the decomposition temperature as compared to pure epoxy resin. Moreover, 3 wt% filler concentration showed increased decomposition temperature because nanoparticles form close connections between molecules due to which thermal stability improved at higher temperatures. Atomic force microscopy was employed for the surface morphology of epoxy resin/Al 2 O 3 nanocomposites which has indicated that surface roughness of epoxy resin/Al 2 O 3 nanocomposites increased slightly with the filler concentration. The distribution of trap energy and trap density obtained by isothermal surface potential decay measurements revealed that 1 wt% filler concentration results in decrease in surface potential decay rate. In addition, significant increase in deep trap energy level and trap density was obvious at 1 wt% filler concentration. AC and DC breakdown strength of the samples was measured to evaluate the effect of filler concentrations on the electrical characteristics of epoxy resin. The results showed that breakdown strength of the epoxy resin/Al 2 O 3 nanocomposites increases with the nano-Al 2 O 3 concentration. Moreover, increase in trap energy results in an increase in the breakdown strength of the nanoparticles.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Wenjing Zhai,Wenhao Zheng,Zhihang Zhang,Lin Huang,Bing Yu,Liufang Chen,Guangyuan Li,Xinyu Li,Xiaohui Zhou,Lin Lin,Zhibo Yan,Chao Chen,Xiangping Jiang,Jun-Ming Liu
The ternary metal chalcogenide AgSbS2 has been regarded as a promising photovoltaic compound due to its excellent stability and nontoxicity. However, the response time of the as-prepared AgSbS2 photodetectors is longer by several orders of magnitude than the time required for practical application, appealing to an improving strategy by alloy engineering. Herein, we fabricated AgSb1–xBixS2 (x = 0–0.5) photodetectors and investigated their photoresponse behaviors. In comparison with the AgSbS2 photodetector, the as-prepared AgSb0.7Bi0.3S2 photodetector demonstrates a remarkable reduction in response time by more than 3 orders of magnitude. It is found that the trap level of AgSb0.7Bi0.3S2 is ∼0.2 eV shallower than that of AgSbS2, which contributes to the dramatic decrease in response time. This work demonstrates that alloy engineering provides an effective solution to considerably shorten photodetector response time and essentially facilitates device optimization.
研究领域:
材料科学
·
光子学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Deng Hu,Hang Luo,Yuan Liu,Fan Wang,Bo Peng,Xiaona Li,Huan Wang,Guanghu He,Dou Zhang
Dielectric capacitors are indispensable energy storage components in both civilian applications and industrial processes. Under elevated temperatures and intense electric fields, polymer dielectrics usually suffer from an inevitably increase in conductivity, leading to a significant reduction in breakdown strength, energy density and efficiency. This investigation aims to design an all-organic dielectric with enhanced high-temperature capacitive performance by introducing a small molecule P-xylene F (PF) into polyetherimide (PEI). Two mechanisms including the incorporation of deep trap energy levels via wide bandgap fillers and the electrostatic interactions by hydrogen bonding between the fillers and the polymer matrix are proposed to support the enhancement. The hydrogen bonding between PF and polyamic acid (PAA)chains induces the formation of physical cross-linking between PF and the negatively charged benzene rings in PEI after imidization. This influences benzene ring stacking within the polymer chains and enhances the film’s mechanical strength. Additionally, PF’s wider bandgap compared to PEI introduces deep trap energy levels, hindering carrier transport and reducing conductive losses at high temperatures. As results, the dielectric achieves an energy density (U d ) of 4.47 J/cm 3 with an efficiency (η) above 90 % at 200 °C. Its excellent stability is also demonstrated with over 210,000 charge–discharge cycles at 200 °C. This study promotes the development of high-performance dielectrics at high temperature.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Photochem
·
2025
·Vol. 5
·期 4
·
IF 2.3
Xiaoman Shi,Huimin Li,Ruiping Deng,Su Zhang,Hongjie Zhang
Long persistent phosphors are widely used in many fields, such as LED, bioimaging, urgent lighting, temperature sensors, etc. Although green and blue long persistent phosphors are well developed, efficient orange-yellow long persistent phosphors are still relatively rare. In this work, a novel orange-yellow long-persistent phosphors Ca2LuScGa2Ge2O12:xPr3+(CLSGGO:xPr3+, x = 0.003, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05) are prepared and systematically investigated through its crystal structural information, photoluminescence, and persistent luminescence properties. Under ultraviolet light excitation, these phosphors exhibit orange-yellow emission stemming from the3P0and1D2multiple electron transitions in the 4f level of Pr3+ion. In addition, the material exhibits bright persistent luminescence. The complex garnet matrix structure of Ca2LuScGa2Ge2O12provides excellent conditions for the formation of traps. Through the testing of thermoluminescence curve and function fitting, the density and depth of traps are studied; also, the storage and release process of carriers in the material are calculated in detail. A reasonable persistent luminescence mechanism is proposed for CLSGGO:0.01Pr3+. This work enriches the research content of photoluminescence and long persistent luminescence of Pr3+-doped garnet-based phosphors and paves the way for the future research of long persistent luminescent materials doped with rare earth ions.
✓ 已验证
产品关联
DOI
高影响因子
Small Methods
·
2023
·Vol. 8
·期 3
·2301001
·
IF 12.4
Xiaomeng Wang,Jiaren Du,Hengwei Lin
Near-infrared persistent luminescence (NIR PersL) materials provide great potential in the fields of night vision, biological imaging, and information encryption. However, among various crystal structures, Cr 3+ -doped gallium garnets show inferior PersL property, which turns out to be the bottleneck of their versatile applications. The rational design and facile preparation of high-performance NIR PersL materials are crucial for the emerging applications. In this work, a series of Gd 3 Mg x Ge x Ga 5-2x O 12 :Cr 3+ ( x = 0, 0.25, 0.5, 0.75, 1) is investigated by microwave-assisted solid-state (MASS) approach. Furthermore, by employing chemical composition co-substitution, PersL performance is further improved and the optimum working temperature is adjusted to the lower temperature at 10 °C. Trap level distribution of Gd 3 Mg 0.5 Ge 0.5 Ga 4 O 12 :Cr 3+ phosphor is revealed based on the temperature and fading-time dependent PersL and thermoluminescence property. Further study demonstrates the reduction of the bandgap and the trap distribution forwards at shallow-lying trap energy levels. The synergistic effect, from both energy-band manipulation and trap-level optimization, facilitates NIR PersL in Cr 3+ -doped gadolinium gallium garnets. These findings confirm the applicability of MASS-based bandgap and defect level engineering for improving the PersL properties in non/inferior-PersL materials. This burgeoning MASS method may facilitate a wide range of PersL materials for various emerging applications.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Qitong Wang,Tianze Wang,Hui Chi,Danying Zhao,Lixuan Yu,Zhenhua Jiang,Yunhe Zhang
Polymer dielectrics are key component for energy storage capacitors in modern electronical equipment with their high breakdown strength, great reliability and processable for large-scale manufacture. However, deteriorated capacitive performance due to dramatically increased conductive loss at elevated temperature fails polymer dielectrics to meet the rising demand for harsh working environment. Herein, a novel thermosetting polymer benzoxazines (BZ) is selected, and a serial of polyetherimide (PEI)/benzoxazines (BZ) dielectric films designed with rich traps are prepared for high temperature capacitive application. The density functional theory (DFT) simulations have revealed that energy barrier can be formed based on the difference in energy band structure of BZ and PEI. Constructed concurrently with dense cross-linking network formed by the polymerization of benzoxazines monomers, PEI/BZ composites can exhibits great capability in restraining the charge transport, suppressing the leakage current density, therefore endowing a significant improvement in energy storage density at elevated temperature. At 150 °C, the PEI/5 wt% BZ composite processes energy storage density ( U e ) as high as 4.64 J cm −3 with charge–discharge efficiency of 92 % at 550 MV m −1 , representing a 2.3-fold increase compared to pure PEI, and capacitive reliability of 50,000 cycles at 400 MV m −1 . Notably, integrated with the controllability of BZ monomer, straightforward film fabrication and the over-all low cost, this design strategy have shed a bright light in the industrial manufacture of high-temperature capacitive materials with superior energy storage performance.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2025
·Vol. 131
·期 6
·1-7
·
IF 2.8
Yuan Lifang,Wang Junzhong,Huang Zhijin,Shen Kaixiang
Long afterglow phosphors have garnered significant attention for their ability to emit light long after excitation ceases. Afterglow emission relies on metastable trap levels within the bandgap of the host materials. Effective trap engineering strategies to optimize traps are critical in determining the afterglow performance. In this study, we investigate the codoping of Bi 3+ and Er 3+ into LiTaO 3 to enhance afterglow performance. Through high-temperature solid-state synthesis, a series of LiTaO 3 :x%Bi 3+ , y%Er 3+ (x = 0 or 0.5%, y = 0.1–4.0%) samples were prepared successfully. Structural characterization confirmed the successful incorporation of Bi 3+ and Er 3+ into the Li⁺ sites without disrupting the host lattice. Photoluminescence studies revealed that Bi³⁺ codoping significantly enhances the green emission of Er³⁺, with optimal performance achieved at 1.0% Er 3+ doping. Thermoluminescence (TL) analysis demonstrated the presence of traps with the depth of 0.748 eV, enabling prolonged afterglow emission at room temperature. The afterglow mechanism involves charge carrier storage in traps under UV excitation, followed by thermal release and recombination at luminescent centers, facilitated by energy transfer from Bi 3+ to Er 3+ . This work provides a strategy for designing a long afterglow phosphor through controlled codoping, offering insights into trap engineering and energy transfer processes in perovskite-based luminescent materials.
研究领域:
材料科学
·
光学材料
·
固体物理
·
发光学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 23
·52314
·
IF 3.057
Xiangrong Chen,Zelin Hong,Chao Dai,Muhammad Awais,Fan-Bo Meng,Ashish Paramane,Hao Li
This paper investigates the influence of voltage stabilizer and nanofiller addition on the insulation performance of the cross-linked polyethylene (XLPE). The test samples of XLPE/stabilizer blends consisting of 1 wt% m-aminobenzoic acid, XLPE nanocomposites consisting of 0.5 wt% nano MgO and XLPE hybrid composite consisting of both voltage stabilizer and nanofillers were prepared. Various physicochemical and electrical properties were measured to analyze the performance of prepared samples. The obtained results show that the addition of nanofillers deteriorates the electrical insulation performance of the XLPE. On the other hand, the voltage stabilizer addition proves to be suitable for enhancing the electrical insulation performance of the XLPE. Meanwhile, the hybrid XLPE composites have shown medium behavior. The voltage stabilizer addition reduces, but the nanofillers increase the space charge density inside the XLPE compared to pure XLPE. It is also found that the dispersion of the voltage stabilizer in the material is uniform, whereas the nanofillers are aggregated. Furthermore, both additives slightly improve the thermal stability of the XLPE. The trap level theory based on quantum chemical calculation is proposed to explain the influence mechanism of the additives on the XLPE.
研究领域:
高分子材料科学
·
电气工程
·
绝缘材料
·
介电物理
·
材料化学
·
聚合物纳米复合材料
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 19
·1613
·
IF 4.4
Xiaomeng Wang,Hengli Zhu,Yan Liu,Jingyuan Li,Lejia Cao,Jiaren Du,Hengwei Lin
Near-infrared (NIR) persistent luminescence (PersL) materials have attracted extensive attention due to their great promise in medical diagnostics, bio-imaging, night vision surveillance, multi-level anticounterfeiting, and information encryption. To achieve NIR PersL (micro/nano-) materials with the desired properties, a variety of synthesis methods have been employed, including solid-phase reaction and liquid-phase synthesis. Different synthesis methods have different but important effects on the micro/nano-structure, luminescence, and PersL properties of the materials. Moreover, the influence of various synthesis methods on the properties of NIR PersL materials determines the selection of preparation approaches for other new material systems. Taking the representative NIR PersL ZnGa 2 O 4 :Cr 3+ material as an example, four synthesis procedures are applied, namely, high-temperature solid-state reaction (SSR), high-temperature molten salt method (MSM), hydrothermal method (HM), and microwave-assisted solid-state (MASS) method. The structural and luminescent properties of samples made by SSR, MSM, HM, and MASS are compared. Notably, it is revealed that the MASS method can create additional trapping energy levels, which is of great significance for emerging applications. This work demonstrates the different effects of synthesis methods on PersL performance and provides a good guideline for the rapid and reasonable selection of preparation methods for diverse applications.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
光学材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2025
·
IF 9.8
Mingyang Zhang,Likun Zang,Hui Tong,Fuyuan Liu
Polyetherimide (PEI), as a kind of high-temperature dielectrics, still face the issue of current leakage under thermo-electrical coupling fields, leading to a sharp degradation of energy storage performance. In this study, an intrinsic PEI with superior comprehensive properties was synthesized using 4,4'-(4,4′-isopropylidenediphenoxy)bis(phthalic anhydride) (BPADA) and 2,2-bis[4-(4-aminophenoxy)phenyl] propane (BAPP) . Through molecular design, an "electron gate" mechanism was introduced via σ-π hyperconjugation effects , effectively suppressing long-range charge delocalization. The resulting intrinsic PEI achieves an energy storage density ( U d ) of 1.93 J/cm 3 at 150 °C , which is 20.6 % higher than that of commercial Ultem™ PEI film (1.6 J/cm 3 ). Further modification was conducted by doping with three molecular semiconductors: 3,4,9,10-perylenetetracarboxylic diimide (PTCDI), 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTCDA), and 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA). Density Functional Theory (DFT) simulations and Low-Energy Inverse Photoemission Spectroscopy (LEIPS) experiments reveal that all three semiconductors exhibit higher electron affinity than the intrinsic PEI. Additionally, Thermally Stimulated Depolarization Current (TSDC) reveals that the incorporation of molecular semiconductors increases trapped charges and trap energy level compared to intrinsic PEI. Both experimental and simulation results consistently demonstrate that molecular semiconductor doping can enhance energy storage performance by constructing deep trap sites within the PEI matrix. Experimental results demonstrate that at 150 °C, the 0.125 % PTCDI-doped PEI achieves a breakdown strength of 545 MV/m, an U d of 3.71 J/cm 3 , and a charge-discharge efficiency ( η ) of 90.13 % (vs. 436 MV/m, 1.93 J/cm 3 , and 94.67 % for intrinsic PEI). This research provides an effective strategy for improving the capacitive performance of polymer dielectrics under thermo-electrical coupling conditions.
研究领域:
高分子材料科学
·
介电物理
·
能源材料
·
功能高分子
·
热电耦合效应
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）