JOURNAL OF MATERIALS RESEARCH
·
2014
·Vol. 29
·期 20
·2473-2482
·
IF 1.815
Yingchang Ke,Hongxu Guo,Dongfang Wang,Jianhua Chen,Wen Weng
The ZrO2 and graphitic carbon nitride (g-C3N4) composite photocatalyst has been prepared by calcination process and hydrothermal treatment. The photocatalyst was characterized by x-ray diffraction, scanning electron microscopy, x-ray photoelectron spectroscopy, UV–vis diffuse reflection spectroscopy, Brunauer–Emmett–Teller and photoluminescence spectra. The photocatalytic activity of the photocatalysts was evaluated by degradation of methylene blue under visible light irradiation. The results showed that the activity of the composite photocatalyst ZrO2/g-C3N4 for photodegradation of MB is much higher than that of either pure g-C3N4 or ZrO2, which is ascribed to the effective electron–hole separation based on the photoluminescence spectra. The •O2 − might be the main active species in MB photodegradation, and the •OH and photogenerated electrons are also partly involved in the process of photocatalytic degradation.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 6
·3110-3123
·
IF 2.302
Li Jingang,Wu Zheyi,Sun Xiaoyu,Zhang Xianwen,Dai Rucheng,Zuo Jian,Zhao Zhi
In this paper, Eu 3+ -doped yttrium tungstate (Y 2 WO 6 ) nanophosphors with different morphologies have been synthesized by a hydrothermal method with the assistance of cetyltrimethyl ammonium bromide. X-ray diffraction (XRD), scanning electron microscopy, transmission electron microscopy, high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED), and photoluminescence spectroscopy (PL) were used to characterize the products. The pH value of the starting solution plays a crucial role in the structures and morphologies of the samples. When the precursors synthesized under alkaline condition are annealed at 1100 °C in the air, the pure monoclinic Y 2 WO 6 phase can be obtained. The results of HRTEM and SAED are consistent with those of the XRD patterns, confirming the high crystallinity of the products. A detailed study of the optical properties, including the UV–Vis diffuse reflection spectra, the excitation and emission spectra, CIE coordinate, and color purity of Y 2 WO 6 :Eu 3+ nanophosphors with different doping concentrations, are presented here. The critical distance R
c and energy transfer mechanism for the concentration quenching of Eu 3+ ions are discussed in detail. In addition, the decay time and the thermal stability of the samples have been also investigated elaborately. The PL properties of the as-synthesized materials indicate promising applications in UV-pumped red light-emitting diodes.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2019
·
IF 4.029
Yanhui Li,Minglang Wang,Haidong Wu,Fupo He,Yong Chen,Shanghua Wu
In this study, the light absorption of the pure ZrO 2 and three types of colorful ZrO 2 mixtures were investigated. It was found that the absorbance of colored ZrO 2 powder increases with the colorant content, and the yellow-colored powder has the strongest absorbance at the wavelength of 405 nm compared with the other two types of colored ZrO 2 powder. The cure behavior investigation on the ceramic suspensions of the above four types of ZrO 2 powders during DLP process shows that as the colorant content increases, the cure depth and excess cure width both decrease due to the ceramic absorbance. The cure depth of colored suspensions is linear with logarithm of incident energy, consistent with Beer-Lambert model, while the further research into the cure width shows that the excess cure width increases nonlinearly with logarithm of incident energy, which is inconsistent with Quasi-Beer-Lambert model. Additionally, colorful ZrO 2 accessories were successfully fabricated.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Chen Jiao,Jiajun Gu,Ying Cao,Deqiao Xie,Huixin Liang,Ruoyu Chen,Tianshu Shi,Lida Shen,Changjiang Wang,Zongjun Tian,Xinyu Yi
Multi-level porous material based on additive manufacturing , is a potentially disruptive material across multiple industries, including medical implants , thermal insulation and filtration. In this study, we propose a novel approach to fabricate materials with controllable pores via digital light processing (DLP) and decomposition of Al(OH) 3 . DLP can be used to fabricate macro pores bigger than 300 μm. And the decomposition of Al(OH) 3 can result in micro pores of about 1 μm inside the scaffolds. The process parameters of curing, debinding and sintering temperature (1100−1500 ℃) of ceramic scaffolds with containing proportion of Al(OH) 3 (0−60 wt.%) were examined. The results indicated multi-level porous ceramic scaffold has controllable porosity and pore size distribution and meets the requirement of implant strength . Biological test show that ceramic scaffolds with multi-level pores promoted osteoblast proliferation and adhesion. The multi-level porous ceramic scaffolds prepared by DLP and decomposition of Al(OH) 3 have great prospects for the application in bone implants .
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JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Liwei Zeng,Jiyou Zhong,Chaojie Li,Zeqiang Zhuang,Lei Chen,Weiren Zhao
Near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) have attracted more and more attention for the applications in spectroscopic technology, promoting the demand of searching broad-band near-infrared phosphors. In this work, Cr 3+ -doped NaInP 2 O 7 phosphors with broadband NIR emission were synthesized via conventional high-temperature solid-state reaction method. The crystal, photoluminescence , and the performance of fabricated device were investigated in detail. The photoluminescence demonstrates this material exhibits an intense absorption in blue light region, matching well with the blue LED chip; while the emission spectra peaking at 870 nm covers 650–1150 nm region with a full width at half maximum (FWHM) of about 150 nm. The quantum yield (QY) and absorption efficiency was determined to be 28.2% and 49.82%, respectively, under 460 nm blue light excitation. Finally, a NIR pc-LED device was fabricated by using a commercial 455 nm blue LED combined with as-prepared NaInP 2 O 7 :Cr 3+ phosphor, which has an output power of 9.08 mW and photoelectronic conversion efficiency of 2.98% under a driving current of 100 mA, indicating that the as-prepared phosphors might have a good potential for application in NIR pc-LEDs.
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Arabian Journal of Chemistry
·
2024
·Vol. 17
·期 9
·105921
·
IF 5.3
Lingxiang Chu,Enbei Yang,Han Ma,Jing Wan,Tao Yang,Yi Qin,Yanqing Ye,Qiang Zhou,Zhengliang Wang
The recent years have witnessed a great leap for near-infrared (NIR) spectroscopy technology in multifunctional application fields. In this study, a double-perovskite structured Cr 3+ -doped Cs 2 KScF 6 fluoride NIR phosphor with peak location at 778 nm and full-width at half maximum (FWHM) of 95 nm was synthesized by a co-precipitation method. The integral emission intensity at 423 K retains 70 % of that at room temperature (RT), showing good luminescent thermal stability. Combining the obtained phosphor in an NIR phosphor converted light-emitting diode (NIR pc-LED) device, the output power and photoelectric conversion efficiency can reach 72.28 mW and 6.83 % at 320 mA. By virtue of the good optical performance, clear structural images of different fruits were visualized by using the NIR pc-LED as light source, suggesting the potential of Cs 2 KScF 6 :Cr 3+ phosphor to be used in high-power LED devices.
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Journal of Asian Ceramic Societies
·
2021
·
IF 3.125
Yanhui Li,Shengliang Wang,Minglang Wang,Xinyue Zhang,Binwen Lu,Yueliang Wang,Dongdong Dong,Fupo He,Wei Liu,Shanghua Wu
Digital light processing (DLP) based stereolithography opens new possibilities for fabricating ceramic accessories with complex structures. The cure depth is a critical criterion for analyzing the production efficiency of ceramic accessories. As predicted using the absorption model, the absorbance from the photoinitiator and dye has a direct effect on the cure depth. In this study, blue-colored powder composed of 3 mol% yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP) and CoAl2O4 powder was prepared through ball-milling. The cure depth of a single layer exposed to varying energy levels was measured, and the values of the depth sensitivity Sd and critical energy Ec were also calculated. The results showed that the absorbance of blue-colored 3Y-TZP powder increased with CoAl2O4 content, which increased the critical energy Ec and depth sensitivity reciprocal 1/Sd. Compared with the pure 3Y-TZP, the cure depth decreased, which was attributable to the absorbance of CoAl2O4. In addition, blue-colored accessories were fabricated using the DLP method, and the microstructures of the accessories were characterized through scanning electron microscopy.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 48
·16941-16949
·
IF 6.4
Shuxian Wang,Jiaming Song,Linghao Zong,Juanjuan Yang,Bingda Li,Feng Teng,Peng Hu,Haibo Fan,Xin Zhao
As promising candidates in optoelectronics, transition metal thiophosphates (MTPs) have attracted intensive research interest due to their strong light absorption and tunable bandgaps. As a member of the MTP family, SnP2S6 has demonstrated significant potential for application in photodetectors (PDs). Here, we report a SnP2S6-based metal–semiconductor–metal (MSM) photodetector with asymmetric electrode contacts. The device demonstrated a responsivity of 146.82 mA W−1 and a detectivity of 8.0 × 1010 Jones in the visible light region. Moreover, it showed self-powered behavior at zero bias voltage with an ultra-low dark current, fast response speed, high responsivity and high detectivity. The self-powered response current of the device could be attributed to the net current generated by the unbalanced energy barriers of the two asymmetric Schottky contacts between the crystal and the gold electrodes. This work provides a possible way for the application of SnP2S6-based PDs in portable energy saving devices.
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Research
·
2022
·
IF 11.036
Kewei Ma,Qingfeng Gui,Cihui Liu,Yunyi Yang,Fangjian Xing,Yunsong Di,Xiaoming Wen,Baohua Jia,Zhixing Gan
Multicolor fluorescence of mixed halide perovskites enormously enables their applications in photonics and optoelectronics. However, it remains an arduous task to obtain multicolor emissions from perovskites containing single halogen to avoid phase segregation. Herein, a fluorescent composite containing Eu-based metal-organic frameworks (MOFs), 0D Cs 4 PbBr 6 , and 3D CsPbBr 3 is synthesized. Under excitations at 365 nm and 254 nm, the pristine composite emits blue (B) and red (R) fluorescence, which are ascribed to radiative defects within Cs 4 PbBr 6 and 5 D 0 → 7 F J transitions of Eu 3+ , respectively. Interestingly, after light soaking in the ambient environment, the blue fluorescence gradually converts into green (G) emission due to the defect repairing and 0D-3D phase conversion. This permanent and unique photochromic effect enables anticounterfeiting and microsteganography with increased security through a micropatterning technique. Moreover, the RGB luminescence is highly stable after encapsulation by a transparent polymer layer. Thus, trichromatic light-emitting modules are fabricated by using the fluorescent composites as color-converting layers, which almost fully cover the standard color gamut. Therefore, this work innovates a strategy for construction of tunable multicolor luminescence by manipulating the radiative defects and structural dimensionality.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Quansheng Wu,Quan Zhao,Ziyu He,Wenbo Chen,Qiang Huang,Penghui Zheng,Dongfeng Xiang,Jiangcong Zhou
The exploration of rare-earth-free phosphors is desirable for white LEDs applications. In this work, Cr 3+ doped Na 2 TiSiO 5 self-activated phosphors were synthesized by conventional solid-state reaction. The electronic structure of Na 2 TiSiO 5 was calculated using density functional theory (DFT) methods. The variations in crystal structure, luminescence properties and thermal stability of Na 2 Ti 1-x SiO 5 : x Cr 3+ were exhaustively investigated by the analysis of XRD patterns , photoluminescence (PL) spectra, diffuse reflection spectra, PL decay curves and temperature-dependent PL spectra. Owing to the red shift of absorption edge and energy transfer between Cr 3+ ions and Ti 4+ ions, the emission intensity and thermal stability of Na 2 TiSiO 5 were improved by the introduction of Cr 3+ ions, and the peak position was red-shifted. The results indicate that the introduction of Cr 3+ ions could be an effective method to regulate the luminescence of Ti 4+ -activated oxide phosphors.
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JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
·
2015
·
IF 3.615
Wenrong Cao,Lifang Chen,Zhiwen Qi
Novel Ag/Ag 2 SO 4 /ZnO nanostructures were successfully fabricated by a facile microwave-assisted template-free hydrothermal method. The results reveal that Ag/Ag 2 SO 4 nanoparticles are uniformly dispersed on the surfaces of ZnO plates, which forms the hierarchical Ag/Ag 2 SO 4 /ZnO (AZ) nanostructures. The AZ-2 photocatalyst obtained by adjusting the amounts of thiourea and AgNO 3 with the molar ratio of 1:1 exhibits the highest photocatalytic efficiency, and rhodamine B can be decolorized within 35 min and 20 min under visible-light ( λ > 420 nm) and natural sunlight irradiation, respectively. The enhanced photocatalytic performance of AZ catalysts may result from the synergistic effects of Ag/Ag 2 SO 4 nanoparticles loaded on ZnO surfaces, which can enhance visible-light absorption capability of ZnO and promote photoinduced electron–hole separation. Therefore, the Ag/Ag 2 SO 4 nanoparticles doped on semiconductors can be used as effective visible-light photocatalysts and show a great potential for practical applications in the treatment of dye-containing wastewater.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2018
·
IF 2.88
Tao Liu,Zhihai Xie,Qing Liu
A sensitive, simple and novel method was developed to determine diclofenac sodium (DS) using silver nanoparticles (AgNPs) as probe by resonance light scattering (RLS) technique. It was found that DS could quench the RLS intensity of AgNPs . Moreover, the decrease in RLS intensity was linearly correlated to the concentration of DS over the range of 0.01–2.0 μg mL −1 . DS can be measured in a short time (5 min) without any complicated or time-consuming sample pretreatment process. Parameters that affect the RLS intensities such as pH, concentration of AgNPs, reaction time, electrolyte concentration , and coexisting substances were systematically investigated and optimized. The results showed that the method had a very good selectivity and could be used conveniently for the determination of DS. The limit of detection (LOD) was 2.85 ng mL −1 (3σ), and the relative standard deviation (RSD) was less than 3.6% ( n = 6). Possible mechanism for the RLS changes of AgNPs in the presence of DS was discussed and the method was successfully applied for the analysis of tablets and urine samples.
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危险品化学品经营许可证（带存储）