Journal of Materials Chemistry C
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2017
·Vol. 5
·期 36
·9255-9263
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IF 5.256
Luqing Xi,Yuexiao Pan,Mengmeng Zhu,Hongzhou Lian,Jun Lin
A kind of red-emitting phosphor NaKSnF6:Mn4+ (NKSF:Mn) has been obtained from NaF and KF with a certain molecular ratio in HF solution at room temperature. The phosphor NKSF:Mn exhibits superior optical properties including high color purity with narrow-band emissions as well as better chromaticity coordinates compared to the red phosphors Na2SnF6:Mn4+ (NSF:Mn) and K2SnF6·H2O:Mn4+ (KSFH:Mn). The composition and structure of NKSF:Mn have been identified by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and transmission electron microscopy (TEM). The formation mechanism of NKSF:Mn is discussed and the morphology, thermal stability, and optical properties of NKSF:Mn have been investigated. The luminescence intensity of NKSF:Mn has been improved by optimizing synthetic parameters. A white light-emitting diode (WLED) fabricated using a blue GaN chip, a yellow YAG:Ce phosphor, and the as-prepared red phosphor NKSF:Mn exhibits superior warm white light with a color rendering index (CRI) of 90.3 at a correlated color temperature (CCT) of 3746 K.
研究领域:
材料科学
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光学工程
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2014
·
IF 1.61
Pengjun Zhao,Lei Wang,Liang Bian,Jinbao Xu,Aimin Chang,Xinqian Xiong,Fanglong Xu,Jiaqi Zhang
Three-dimensional hierarchical structure coral-like BaTiO 3 nanoparticles have been self-assembled by a facile one step hydrothermal method . Cetyltrimethyl ammonium bromide (CTAB), Ba(OH) 2 ·8H 2 O and tetrabutyl titanate have been used as precursors. The prepared BaTiO 3 exhibits cubic perovskite phase at room temperature, and the coral-like architecture is a micro-nano hiberarchy consisted of dendrimer-like structure and trunk-like structure. By adjusting the hydrothermal duration and the precursor substances, a surfactant induced mechanism is proposed to understand the self-assembly process. UV-vis measurement demonstrates that the as-prepared BaTiO 3 nanoparticles exhibit dozens of times overwhelming absorptive character compared to the ordinary nanospheres at ultraviolet band, which is benefited from the coral-like porous framework. Moreover, halogen anions( F − , Cl − , Br − , and I − ) have been chosen to adjust the coral-like BaTiO 3 physical properties. Results show the halogen doping produces distinct modulation effect on the grain size, UV-vis absorbance and photoluminescence properties of the materials. The coral-like BaTiO 3 nanoparticle and its halogen modified ramifications offer significant opportunities to develop nano-laser devices, photon detectors, photocatalyst based on BaTiO 3 perovskite materials.
研究领域:
材料科学
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纳米技术
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DOI
高影响因子
Optical Materials Express
·
2016
·Vol. 6
·期 2
·610-619
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IF 2.657
Xianqiang Chen,Haiming Qin,Ye Zhang,Yongfu Liu,Jun Jiang,Haochuan Jiang
Transparent polycrystalline NdxGd3-xAl3Ga2O12 (Nd:GAGG) ceramics were prepared via solid-state reactive sintering from a mixture of commercial Gd2O3, Al2O3, Ga2O3, Nd2O3 and 0.05wt.% ZrO2 powders at 1650 °C. Fully dense ceramics were obtained for all samples with different Nd2O3 doping level. Uniform microstructures with average grain size of about 20 μm were observed in the ceramics, while no secondary phase was detected. Optimum transmittance of as high as 77% in near-infrared bands, which is close to its theoretical value of 81.1%, was achieved in the 0.8 at.% Nd:GAGG ceramics. The spectroscopic properties of the Nd:GAGG transparent ceramics were also investigated. Absorption cross-section of the 0.8 at.% Nd:GAGG ceramic at 808 nm is about 4.1 × 10−20 cm2. The emission cross-section at 1063 nm is about 1.8 × 10−19 cm2.
研究领域:
材料科学
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光学工程
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高影响因子
POLYMER INTERNATIONAL
·
2023
·Vol. 72
·期 6
·569-577
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IF 3.2
Weilian Wu,Shiqing Lai,Hongchao Niu,Chanjuan Liu,Zengfang Huang,Li Zhou,Xiaohua Huang
Three novel fluorinated polyimides (PIs) were synthesized via one-step solution polycondensation from a new diamine monomer, 4-(3-methoxy-4-(difluoromethoxy)phenyl)-2,6-bis(4-aminophenyl)pyridine, and three commercially available aromatic dianhydrides. The solubility, thermal, optical, hydrophobic and gas transport properties of the obtained PIs were investigated. The results demonstrated that these polymers present good solubility in dimethylformamide, N -methylpyrrolidone, dimethylsulfoxide, dimethylacrylamide, CHCl 3 , tetrahydrofuran and CH 2 Cl 2 at room temperature or upon heating. Meanwhile, they displayed excellent thermal properties with glass transition temperature of 261–345 °C, weight loss temperatures at 10% of 518–523 °C as well as char yield of 60–62% at 800 °C in nitrogen atmosphere. Furthermore, the PI membranes have good hydrophobic properties with water contact angle value in the range 90.1–92.0°. Moreover, they show excellent optical properties, with cut-off wavelength ( λ cut-off ) values of 368–381 nm and wavelength values at 80% transmittance ( λ 80% ) of 421–462 nm. The pure gas permeabilities of He, CO 2 , O 2 and N 2 of the PI membranes were measured by the method of constant volume–variable pressure. The PI containing 4,4′-(hexafluoroisopropyl)diphthalic anhydride moiety exhibits the largest molecular chain spacing and free volume, giving the best gas transport performance in this work. Molecular simulation results show that the introduction of fluorine-containing structure and bulky pendant into polymer backbones is beneficial for gas transport. © 2023 Society of Industrial Chemistry.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Lin-Lin Zhu,Hong-Lan Liu,Hua-Tay Lin,Xing-Hao Tan,Jia-Hao Chen,Xin Xu,Guang-Xiang Zhang,Yu-Jian Jian,Min-Min Dai,Cheng-Cai Zhao
Erbium oxide (Er 2 O 3 ) transparent ceramics were successfully fabricated with different contents of zirconia (ZrO 2 ) additive sintered at 1850 °C for 8 h in vacuum. The effects of ZrO 2 concentration on microstructure, optical, mechanical, and thermal properties of Er 2 O 3 transparent ceramics were systematically investigated in this study. With the concentration of ZrO 2 increasing from 0 to 4 at.%, the average grain size of Er 2 O 3 transparent ceramics decreased from 166.6 to 4.7 μm. Also, the Vickers hardness and fracture toughness were increased from 7.6 ± 0.3 to 10.1 ± 0.3 GPa and 0.69 ± 0.05 to 1.09 ± 0.03 MPa m 1/2 , respectively. However, the thermal diffusion coefficient and thermal conductivity reduced slightly after the doping of ZrO 2 . The in-line transmittance of 4 at.% ZrO 2 -doped Er 2 O 3 ceramics with the excellent optical quality reached 77% in the visible range and 78% at 1100 nm, which were 95% and 96% of the theoretical in-line transmittance of Er 2 O 3 single crystal, respectively. There were absorption peaks at 1500 nm and in the visible light range of 4 at.% ZrO 2 -doped Er 2 O 3 ceramics. The Er 2 O 3 ceramics developed in this study can be potential candidates for application in solid-state lasers.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
Science China-Chemistry
·
2021
·Vol. 64
·期 9
·1498-1503
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IF 9.445
Zhang Wenyao,Zhang Zhizhong,Jin Wenqi,Zhang Ruonan,Cheng Meng,Yang Zhihua,Pan Shilie
The introduction of oxofluoride anion into anionic group assists to tune optical properties owing to the change of coordination, electronegativity, and according anionic framework. Here, we proposed a rational design of new compounds by fluorine-driven structure and optical property evolution. A new borophosphate Ba 2 BP 3 O 11 with the monoclinic space group P 2 1 / c has been synthesized in the sealed system. Ba 2 BP 3 O 11 exhibits a rare P–O–P bridge formation, which is the first example in alkaline-earth metal borophosphates. By further substituting [BO 4 ] 3− with [BO 3 F] 4− , the first alkaline-earth metal/lead fluoroborophosphates M 2 BP 2 O 8 F (M = Ba and Pb) with the same space group were designed. Since the scissors effect of fluorine, in M 2 BP 2 O 8 F (M = Ba and Pb), a BO 3 F tetrahedron corner-sharing with three PO 4 tetrahedra forms 1D chains along the b -axial direction, which are filled by MO n (M = Ba/Pb, n = 5, 6, 8) distorted polyhedra. The first principles calculation shows that the borophosphate Ba 2 BP 3 O 11 has a birefringence about 0.013 @1,064 nm, while the fluoroborophosphates M 2 BP 2 O 8 F (M = Ba and Pb) have the values of 0.035 and 0.043 @1,064 nm, respectively. Such an apparent enhancement in birefringence is derived from synergies of the oxyfluoride and cation. The introduction of fluorine-containing heteroanionic groups provides a feasible strategy to design novel promising optical materials.
研究领域:
材料科学
·
光学
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DOI
高影响因子
Silicon
·
2025
·
IF 3.3
Li Zhaorui,Li Zhiqiang,Wu Yonghong,Zhu Wenle,Nie Lifang,Liu Juncheng
To improve the efficiency of solar cells, antireflective films require not only high optical properties but also high mechanical properties. The antireflective films were prepared by tetraethylorthosilicate (TEOS) and methyltriethoxysilane (MTES) as precursors and fatty alcohol polyoxyethylene ether (AEO) as the porogen. The microstructures, optical properties, and mechanical properties of the prepared antireflective films were examined. The results indicated that the AEO volume ratio had an obvious effect on film porosity, refractive index and average transmittance. With the increase of AEO content, the film’s porosity and the average transmittance firstly increased then decreased, the refractive index firstly decreased then increased in the wavelength range of 400–1100 nm. In the meanwhile, both the film’s surface hardness and adhesion strength increased with the increasing of the AEO addition. When the volume ratio of AEO is 45%, the porosity of the film is 48%,the refractive index value for 550 nm wavelength is 1.26and the maximum transmittance is 98.50%.The highest amount of light passing through a material, also known as transmittance, is recorded at an average of 91.98%within the wavelength range of 400–1100 nm, which is 4.64%higher than that of blank glass. In addition, the hardness of the film reaches the highest level for soft films 9H, and its adhesion strength also reaches the highest level of the tape method, 0 grade.
研究领域:
材料科学
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太阳能技术
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DOI
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2024
·Vol. 26
·期 14
·2302224
·
IF 3.4
Mtawa Alsaadi,Kittitat Lerttraikul,Sojiphong Chatraphorn,Salinporn Kittiwatanakul
Due to the growing need for smart windows for buildings to reduce energy usage, vanadium dioxide (VO 2 ) has been investigated as a potential material for thermochromic smart windows due to its ease of implementation and simplicity in industrial production. VO 2 undergoes a reversible phase shift from a monoclinic (M, P21/c) semiconductor to a rutile (R, P42/mnm) metal at a critical temperature of 68 °C. This transition is accompanied by acute variations in IR reflectance, transmittance, and electrical resistance. Despite substantial developments in thermochromic materials, their optical and transition properties are still unsatisfactory. In the past several decades, many methods for enhancing optical properties have been reported, including composite films, multilayer structures, and element doping. Recent developments in thermochromic smart windows to improve both optical properties and durability have been surveyed in this review. Additionally, future growth trends have been provided by the possibility of commercially manufacturing VO 2 smart windows.
研究领域:
材料科学
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能源技术
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DOI
高影响因子
MACROMOLECULES
·
2021
·
IF 5.985
Shuai Sun,Yijiao Xue,Xiaodong Xu,Liping Ding,Zhen Jiang,Linghui Meng,Pingan Song,Yongping Bai
It has been highly desirable to develop high-performance thermoplastic polyesters that are strong, tough, and highly stretchable, in addition to high glass transition and excellent optical properties. The performance portfolio is essential for the practical applications of polyesters in high-end areas of aerospace, energy, medical sterilization, and optics. However, current material design strategies have failed to endow polyesters with such integrated performances. Herein, we report the facile synthesis of modified copolyesters with multiple hydrogen bonds (H-bonds) on the main chains via condensed polymerization. The resultant copolyester records a break strain as high as 438% and a large toughness of 106.7 MJ/m3, representing the most stretchable and toughest thermoplastic polyesters so far, while exhibiting a high tensile strength of 59.6 MPa because of intermolecular multiple H-bonding. In addition to achieving an enhanced glass transition temperature (∼85.9 °C), the copolyester films exhibit improved postcrystallization optical transparence and good flexibility due to the grain refinement effect. This work provides an innovative design concept to prepare a new class of advanced polyesters with outstanding mechanical, thermal, and optical properties, thus holding great promise for many potential industrial applications.
研究领域:
材料科学
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高分子化学
·
光学材料
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2010
·Vol. 18
·期 6
·1261-1268
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IF 1.364
Zhang Gang,Huang Guang-shun,Wang Xiao-jun,Long Sheng-ru,Yang Jie
Two kinds of aromatic dibenzoyl chloride monomer containing thioether unit 4,4′-Bis(4-chloroformylphenylthio)benzophenone (BP-DC) and 4,4′-thiodibenzoyl chloride (T-DC) were synthesized with two steps, which was reacted with diamine monomer containing thioether and amide unit to prepare a new kind of polyamide containing high quantity thio-ether group. The intrinsic viscosity of the polyamides was 0.76–0.90 dl/g obtained with optimum synthesis conditions. The polymers were found to have good optical properties: the optical transmittance of the aromatic polyamide film at 450 nm is higher than 80%, meantime the high quantity thio-ether unit provided the polymer with a high refractive index ranging from 1.691 to 1.696 and low birefringence of 0.007–0.008. At the same time the polymers had excellent thermal performance with glass transition temperature (T g ) of 226 °C–278 °C, initial degradation temperature (T d ) of 427 °C–439 °C. They showed improved solubility in polar aprotic solvents.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Silicon
·
2020
·Vol. 12
·期 12
·3005-3013
·
IF 1.499
Pan Zhaoqun,Zeng Kelin,Huang Bingsheng,Zhu Liqiang
The oligosiloxane resins were synthesized through hydrolytic sol-gel reaction and remained many hydroxyl groups, which did great harm to the curing process and resulted in poor performance of the cured products. In previous works, epoxy-modified silicone resins were synthesized by dealcoholization, a reaction between 3-glycidoxypropylmethyldimethoxysilane and terminal hydroxyl groups in phenyl silicone resins. Although this method eliminated the hydroxyl groups, it caused a large loss of vinyl groups inevitably and a poor stability of cured products. In this study, methyltrimethoxysilane (MTMS) was used to eliminate hydroxyl groups containing in vinyl methyl phenyl silicone resins, which were synthesized through hydrolytic sol-gel reaction. Most of residual hydroxyl groups were deleted effectively and the great loss of vinyl groups were avoided in the dealcoholization reaction. Then, the methyl phenyl silicone materials were fabricated by hydrosilylation reaction between the synthesized vinyl methyl phenyl silicone resins and hydrogen-containing ones. The cured silicone materials showed excellent optical performance (~ 89.1% at 450 nm) and good adhesion performance. In addition, due to less vinyl loss in the vinyl methyl phenyl silicone resins, the cured methyl phenyl silicone materials exhibited higher cross-linking density, better thermal resistance (5% mass loss at 435 °C) and better mechanical properties (50 shore D) compared with the epoxy-modified phenyl silicone materials. The lumen depreciation (working 168 h at 50 mA) and reflow soldering tests further demonstrated the methyl phenyl silicone materials possessed good thermal stability. These results indicated that the methyl phenyl silicone materials could be used as a LED encapsulant with a good performance.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2012
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IF 4.542
Jing Du,Yanfeng Gao,Zhang Chen,Litao Kang,Zongtao Zhang,Hongjie Luo
Application of VO 2 to smart windows calls for an enhancement of both luminous transmittance ( T lum ) and solar transmittance modulation (Δ T sol ). These two properties are related to optical constants , microstructure and film thickness. In this article, VO 2 -based films with increased microroughness are prepared by polymer assisted deposition , and ZnCl 2 is added to the precursor solution to control the microstructure of the films. Addition of ZnCl 2 increases the microroughness of films through phase separation, which largely decreases the refraction index and the reflectivity of the films, resulting in enhanced luminous transmittance and solar transmittance modulation; two films with balanced optical performance show T lum =50.5% and Δ T sol =11.3%, and T lum =59.3% and Δ T sol =10.5%, respectively. Moreover, this kind of microstructure control has no influence on doping VO 2 , which is proven by the deposition and characterization of W-doped VO 2 -based films. By the formation of a W-doped VO 2 /F:SnO 2 /glass multilayer stack, a film shows excellent thermochromic properties and low emissivities; typically, a film with a phase transition temperature, T lum , Δ T sol of 43.4 °C, 30.0%, 8.82%, respectively, and emissivity of 0.20 for monoclinic and 0.33 for rutile phase is successfully prepared.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）