Journal of Semiconductors
·
2020
·Vol. 41
·期 5
·052204
·
IF 0
Nian Liu,Xue Zhao,Mengling Xia,Guangda Niu,Qingxun Guo,Liang Gao,Jiang Tang
Light-emitting diodes based on lead halide perovskite have attracted great attention due to their outstanding performance. However, their application is plagued by the toxicity of Pb and the poor stability. Herein novel copper-based all inorganic perovskite CsCu2I3 with much enhanced stability has been reported with a potential photoluminescence quantum yield (PLQY) over 20% and self-trapped excitons (STE). By taking advantage of its extraordinary thermal stability, we successfully fabricate high-quality CsCu2I3 film through direct vacuum-based deposition (VBD) of CsCu2I3 powder. The resulting film shows almost the same PLQY with the synthesized powder, as well as excellent uniformity and stability. The perovskite light-emitting diodes (Pe-LED) based on the evaporated CsCu2I3 emitting layer achieve a luminescence of 10 cd/m2 and an external quantum efficiency (EQE) of 0.02%. To the best of our knowledge, this is the first CsCu2I3 Pe-LED fabricated by VBD with STE property, which offers a new avenue for lead-free Pe-LED.
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INTEGRATED FERROELECTRICS
·
2020
·
IF 0.557
Shanshan Gao,Peisong Tang,Bingqi Pan,Qinyi Li,Yangbin Ding
TmVO4 precursor gel was prepared by sol-gel method using thulium oxide, nitric acid, ammonium metavanadate and citric acid as main raw materials. Then the xerogel was calcined at 600–800 °C in muffle furnace to prepare TmVO4. The prepared samples were characterized by thermogravimetric differential scanning analysis (TG-DSC), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), diffuse reflectance spectroscopy(DRS) and Fourier transform infrared spectroscopy(FT-IR). The visible-light photocatalytic activity of TmVO4 was studied by using methylene blue solution as simulated wastewater. The result shows that TmVO4 can be obtained by calcination at 700 °C. The average grain size is about 80 nm and the bandgap is 2.16 eV. Under visible-light conditions, the degradation rate of methylene blue can reach more than 90% when methylene blue solution of 10 mg/L was illuminated 60 min in the presence of nanoparticulate TmVO4. The nanoparticulate TmVO4 has excellent photocatalytic degradation activity for methylene blue. Nanoparticulate TmVO4 prepared by sol-gel method has broad application prospects in photocatalytic degradation of organic pollutants.
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高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2024
·Vol. 121
·期 30
·e2401452121
·
IF 9.4
Shujun Liu,Hong Wang,Zehui Hu,Xin Zhang,Yanjuan Sun,Fan Dong
Nitrophenols present on the surface of particulates are ubiquitous in the atmosphere. However, its atmospheric photochemical transformation pathway remains unknown, for which the crucial effect of visible light is largely overlooked, resulting in an incomplete understanding of the effects of nitrophenols in the atmospheric environment. This study delves into the photolysis mechanism of 4-nitrophenol (4NP), one of the most abundant atmospheric nitrophenol compounds, on the surface of photoactive particulates under visible light irradiation. Unexpectedly, the nonradical species (singlet oxygen, 1O2) was identified as a dominant factor in driving the visible photolysis of 4NP. The pathways of HONO and p-benzoquinone (C6H4O2) generation were clarified by acquiring direct evidence of C–N and O–H bond breakage in the nitro (–NO2) and hydroxyl (–OH) groups of 4NP. The further decomposition of HONO results in the generation of NO and hydroxyl radicals, which could directly contribute to atmospheric oxidizing capacity and complicate the PM2.5 composition. Significantly, the behavior of 1O2-induced visible photolysis of 4NP was universal on the surface of common particulates in the atmosphere, such as A1 dust and Fe2O3. This work advances the understanding of the photochemical transformation mechanism of particulate-phase atmospheric nitrophenols, which is indispensable in elucidating the role of nitrophenols in atmospheric chemistry.
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高影响因子
Laser & Photonics Reviews
·
2023
·Vol. 17
·期 4
·2200871
·
IF 11
Shuxin Wang,Yongjie Liu,Chenwei Liu,Wenlong Shao,Chen Wang,Meng Xiao,Guoyi Chen,Zhiqiu Yu,Chen Tao,Weijun Ke,Guojia Fang
Perovskites are promising light emitters that can cover broad-range emissions over the entire visible spectrum. However, few studies have focused on uncommon wavebands, such as far-red emission of 700–750 nm that has broad applications in biology, horticulture lighting, optogenetics, etc. Here, a strategy is demonstrated to achieve high-performance far-red perovskite light-emitting diodes (PeLEDs) through antisolvent engineering. First, 1,3,5-tris(1-phenyl-1H-benzimidazole-2-yl) benzene (TPBi) is introduced into n-i-p perovskite matrix not only to passivate the defects but also to balance carrier mobility as well as adjust the energy level alignment between perovskite and the electron transport layer. The n-type TPBi can prevent hole carriers’ movements in perovskite light emitters and enhance electron injection. Furthermore, the incorporation of TPBi uplifts the Fermi energy level of perovskites by 0.32 eV as well as diminishes the conduction band offset between zinc oxide (ZnO) and the perovskite emitters, hence alleviating the accumulation of charges at the interface. Consequently, the PeLEDs with TPBi-modified perovskite emitters show an invariable far-red emission peak at around 735 nm with a champion external quantum efficiency of 14.22%. This work makes up the far-red emission of perovskite light-emitting devices and boosts latent capacity of PeLEDs for future application.
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高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2014
·Vol. 52
·期 12
·1676-1685
·
IF 3.245
Shanshan Bian,Jin Zheng,Wuli Yang
The synthesis and characterization of a new photocleavable crosslinker is presented here. Dual stimuli-responsive P(VCL- co -NHMA) microgels were prepared by precipitation polymerization of vinylcaprolactam (VCL) with N -hydroxymethyl acrylamide (NHMA) and the new crosslinker. The microgels had distinct temperature sensitivity as observed in the case of PVCL-based particles and their volume phase transition temperature (VPTT) shifted to higher temperature with increasing NHMA content. Photolytic degradation experiments were investigated by irradiation with UV light, which led to microgel disintegration caused by cleavage of the photolabile crosslinking points. The degradation behavior of the microgels was conducted with respect to degradation rates by means of the relative turbidity changes. Hence, the microgels could totally degrade into short linear polymers by UV light, thus representing a great potential as new light and temperature dual responsive nanoscale materials. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52 , 1676–1685
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高影响因子
Nano Research
·
2023
·Vol. 17
·期 4
·3120-3129
·
IF 9.9
Hu Lulin,Yu Xinxin,Hao Jingcheng,Xu Lu
Owing to their low flexibility, poor processability and a lack of responsiveness, inorganic materials are usually non-ideal for constructing a living organism. Hence, to date, lifelike materials with structural hierarchies and adaptive properties usually rely on light and soft organic molecules, although few exceptions have been acquired using two-dimensional (2D) inorganic nanosheets. Herein, with a systematic study on the gelation behavior of carbon-based 0D quantum dots, 1D nanotubes, and 3D fullerenes, we find that acidified 1D carbon nanotubes (CNTs) can serve as an alternative building block for fabricating purely inorganic biomimetic soft materials. The as-prepared CNT gels exhibit not only a pH- or photothermal-triggered mechanical and tribological adaptivity, which allows them to simulate the behavior of sea cucumbers, peacock mantis shrimps, and mammalian muscles or cortical bones, but also a unique damping property that is similar to spider’s cuticular pad. Their high elasticity, effective lubrication, excellent biocompatibility, and controllable friction and wear also allow them to function as a new type of smart lubricants, whose tribological properties can be regulated either by its internal pH changes or spatiotemporally by near-infrared (NIR) light irradiations, free of any toxic and flammable base oils or additives.
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高影响因子
Nano Research
·
2023
·Vol. 16
·期 7
·10156-10163
·
IF 9.9
Li Haotao,Tian Fengshou,Chen Shuming
The importance of optical resonance in enhancing light outcoupling efficiency (OCE) is frequently overlooked in conventional bottom-emitting quantum-dot light-emitting diodes (QLEDs) due to their weak microcavity effect. Herein, we show that by synergistically optimizing the optical and the electrical performances, QLEDs with efficiency approaching the theoretical limit can be realized. By introducing a high refractive index indium zinc oxide (IZO) electrode and optimizing its thickness, the light OCE is significantly improved and consequently the red QLEDs exhibit an external quantum efficiency (EQE) of 33.2%, which is 1.4-fold higher than that of the reference devices with conventional indium tin oxide (ITO) electrodes. Moreover, with a high refractive index plastic substrate and a microlens array, the EQE can further be improved to a record value of 37.5%. Similar results are obtained in green and blue devices, which show an EQE of 18.8% and 14.4%, respectively. We also predict that the theoretical EQE limit of red, green, and blue QLEDs can reach 35.4%–36.5%, 24.8%–34.0%, and 25.1%–35.8%, respectively, without using any light outcoupling structures. The proposed synergistic optimization strategy enables the efficiencies of red, green, and blue QLEDs to approach their theoretical limits.
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高影响因子
PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2015
·Vol. 35
·期 2
·355-364
·
IF 2.056
Zhu Chengzhu,Liu Ying,Lu Jun,Yang Zhe,Li Yunxia,Chen Tianhu
The removal of gaseous ethanethiol (EtSH) via dielectric barrier discharge (DBD) combined with 185 nm UV-light energized by a DBD power supply has been investigated. EtSH removal efficiency and energy yield had been examined as a function of EtSH initial concentration, input power, gas flow rate and relative humidity of gas flow. The results showed that DBD combined with 185 nm UV-light could improve EtSH removal efficiency by about 10.4 % and increase energy yield by 0.4 g (kWh) −1 as compared with DBD treatment only. When increasing initial EtSH concentration and flow rate, a higher energy yield was obtained. And EtSH removal efficiency increased as the relative humidity increased to about 70 %, then decreased when the humidity continue to increase. Moreover, the possible reaction pathways were proposed based on the products identified by FT-IR.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2014
·Vol. 30
·期 2
·310-314
·
IF 1.119
He Hongyan,Li Wenliang,Xie Zhigang,Jing Xiabin,Huang Yubin
Aldehyde group-functionalized [Ru(bpy) 2 L](PF 6 ) 2 catalyst was prepared and immobilized onto the mesoporous silica nanoparticles to act as a heterogeneous catalyst for the selective oxidation of thioanisole to methyl phenyl sulfoxide under visible light. The heterogeneous catalyst can be easily recovered by simple centrifugation without chemical treatment, exhibiting comparable catalytic efficiency with homogeneous ones and no decrease in catalytic efficiency after at least 5 cycles.
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高影响因子
CRYSTENGCOMM
·
2014
·Vol. 17
·期 3
·671-677
·
IF 3.858
Qinghua Wang,Shiyong Yu,Zhibing Tan,Renfei Zhang,Zhao Li,Xuechuan Gao,Beibei Shen,Haiquan Su
In this work, monodisperse CeO2/Bi2O3 nanospheres were successfully synthesized via the three-step method, which is a traditional hydrothermal dip-coating–anneal method, and subsequent facile calcination at 600 °C for 4 h. The structure of obtained products was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). The results showed that highly uniform CeO2 microspheres and monodisperse CeO2/Bi2O3 nanospheres were obtained, the sizes of CeO2 microspheres and CeO2/Bi2O3 nanospheres were ~100 nm and ~125 nm. Besides that, the photocatalytic activities of CeO2/Bi2O3 nanocomposites were evaluated by photodegradation of Rhodamine B (RhB) under visible light. CeO2/Bi2O3 nanospheres exhibited a wide visible-light absorption with an edge at ca. 800 nm, which indicated a wide red shift compared to that of individual CeO2 microspheres (ca. 450 nm) and individual Bi2O3 nanoparticles (ca. 450 nm). Furthermore, the obtained CeO2/Bi2O3 nanospheres had remarkable photocatalytic degradation activities of dye under visible light compared with the activities of two individual photocatalysts of CeO2 microspheres and Bi2O3 NPs with the same concentration. The higher photocatalytic degradation activities of the photocatalysts could be ascribed to the following factors: (1) a large specific surface area of CeO2/Bi2O3 nanospheres with small size, (2) the efficient separation of photogenerated electrons and holes of the photocatalysts, and (3) a wide visible-light photoabsorption range (700 nm > λ > 400 nm). Therefore, small monodisperse CeO2/Bi2O3 nanospheres were designed by a simple route with efficient photocatalytic activity.
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高影响因子
Materials Chemistry Frontiers
·
2024
·Vol. 8
·期 19
·3214-3222
·
IF 6
Jiaqi Liu,Feng Zhang,Cuihe Fan,Zhengwei Cao,Yuying Hao
Perovskite quantum dots (QDs), with outstanding properties, including tunable emissions, high color purity, and low cost solution processability, have become promising candidates in light-emitting applications. However, the inherent instability issue strongly restricts further development and commercialization of light-emitting devices based on perovskite QDs. As well investigated in conventional QDs, the construction of QDs with core–shell structure is recognized as an effective way to improve the stability and optimize luminescent properties at the same time. Inspired by the unique structure diversity of perovskite materials, 2D/3D FAPbBr3@GA2PbBr4 QDs are proposed and fabricated through a one-step phase transfer enhanced emulsion synthesis. By systematically tuning the ratio between GABr and FABr as well as a combined analysis with X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, absorption and photoluminescence spectrum characterizations, a well-defined core–shell structure is demonstrated for FAPbBr3@GA2PbBr4 QDs under an appropriate ratio of GABr/FABr. Compared to the original QDs, the as fabricated core–shell QDs exhibit an enhanced exciton binding energy and improved stability under heat, light, and moisture exposure. Moreover, phosphor converted light-emitting diodes based on the core–shell QDs are also fabricated with a much improved device performance than that of QDs without a core–shell structure, proving the superiority of FAPbBr3@GA2PbBr4 QDs in light-emitting applications.
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高影响因子
RSC Advances
·
2012
·Vol. 2
·期 27
·10330-10336
·
IF 0
Jungang Hou,Chao Yang,Zheng Wang,Shuqiang Jiao,Hongmin Zhu
Large-scale hydrogen production through water splitting using photocatalysts with solar energy can potentially produce clean fuel from renewable resources. In this work, photocatalytic hydrogen evolution with a high efficiency was achieved using CdS nanocrystal decorated CdLa2S4 microspheres (CdS/CdLa2S4) successfully prepared by a two-step hydrothermal process. The obtained CdS/CdLa2S4 composite was characterized by X-ray diffraction (XRD), electron microscopy (EM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance absorption spectroscopy (DRS), and photoluminescence spectroscopy (PL). XRD demonstrated that highly crystalline hexagonal CdS was obtained in CdS/CdLa2S4. EM results revealed that CdLa2S4 microspheres assembled from a large number of nanoprisms, were intimately enwrapped by the surrounding CdS nanocrystals with a particle size below 20 nm. This unique architecture resulted in the appropriate dispersion of CdS nanocrystals and intimate multipoint contacts between the CdS nanocrystals and CdLa2S4, which led to significant enhancement of charge separation in CdS/CdLa2S4. Especially, the CdLa2S4 microspheres decorated with 3 wt% CdS nanocrystals containing 0.4 wt% of Pt showed a high rate of H2-production at 2.25 mmol h−1 with an apparent quantum efficiency of 54% under 420 nm monochromatic light. The rate of hydrogen evolution from water splitting was 9 times faster in comparison with the rate observed on pure CdLa2S4, which is ascribed to the presence of CdS nanocrystals that alter the energy levels of the conduction and valence bands in the coupled semiconductor system.
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