RSC Advances
·
2017
·Vol. 7
·期 27
·16662-16667
·
IF 3.108
Li Wang,Haoran Zhang,Xiaohua Zhou,Yingliang Liu,Bingfu Lei
Light-emitting diodes (LEDs) are widely used for artificial lighting in plant factories and have been applied for disease prevention and for accelerating plant growth. In this study, a unique dual-emitting core–shell CDs/CaAlSiN3:Eu2+-silica powder was prepared by a one-pot sol–gel method. LED devices with multi-wavelength emission (623 nm red light and 465 nm blue light) were fabricated using the as-prepared dual-emitting core–shell CDs/CaAlSiN3:Eu2+-silica powder, and the electrical characteristics of these LED devices were evaluated. Furthermore, it was demonstrated that these LED devices could be used for plant growth lighting in plant factories. The LEDs prepared in the present study for plant growth lighting have the advantage of being convenient, low-cost, non-toxic, and stable compared with traditional LED devices for plant growth lighting.
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高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Junxiang Pei,Haofeng Li,Fayi Chen,Zitao Chen,Xiaodong Yuan,Zhaoxia Han,Daqin Chen,Dechao Yu,Dawei Zhang
Carbon quantum dots (CQDs) with fluorescence emission have been widely studied for versatile applications, but facile tunability of the spectral properties of CQDs by doping remains to be further explored. Herein, employing lanthanide ion Eu3+ as a dopant and activator, a simple and efficient synthesis route for pure CQDs and Eu-CQDs was demonstrated using N, N-dimethylformamide, oleic acid, and oleylamine as precursors for carbon sources. In comparison, with the popular citric acid precursor, the as-prepared CQDs and Eu-CQDs exhibited an obviously smaller particle size (1.72 ± 0.29 nm) and a more uniform distribution. Through systematic optimization of Eu3+ doping for the Eu-CQD system, colorful light emissions in the visible range were first realized under excitation of ultraviolet (UV) ∼360 nm for promising application of UV-triggered light-emitting diodes. Most interestingly, this Eu-CQD solution with UV-excited colorful light emissions was utilized as a visual pH sensor, experimentally featuring good repeatabilities and stabilities (pH values switching between 7 and 14). Besides, the Eu-CQD solution exhibited highly sensitive detection characteristics for Co (II) ions. Due to the spectral overlapping, the quenching efficiency is as high as 96.3%, and the detection limit is obtained as 0.139 μM, which is much lower than the maximum concentration of Co (II) in the drinking water permitted by WHO. All of these relevant results significantly demonstrate the great potential of lanthanide doping in the multifunctionalization of CQDs for certain emerging applications like lighting, sensing, and detection.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2016
·
IF 2.653
Fang Zhang,Yonghong Zheng,Jiaman Liang,Sha Long,Xianping Chen,Kejun Tan
A simple, highly sensitive resonance light scattering (RLS) method for the detection of perfluorooctanoic acid (PFOA) has been developed based on the interaction with crystal violet (CV). It was found that PFOA can form complexes with CV in acid medium resulting in remarkable enhancement of the RLS intensity of the system. And the enhanced RLS intensities are in proportion to the concentration of PFOA in the range of 0.1–25.0 μmol/L (R 2 = 0.9998), with a detection limit of 11.0 nmol/L (S/N = 3). In this work, the optimum reaction conditions and the interferences of foreign substances were investigated. The reaction mechanism between CV and PFOA was also studied by the absorption spectrum and scanning electron microscope (SEM). This method is successfully applied to the determination of PFOA in tap water and Jialing river water samples with RSD ≤ 4.04%.
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高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Bolin Li,Yun He,Menghan Xiao,Yiran Zhang,Zhen Wang,Zhenhua Qin,Bo Chai,Juntao Yan,Jianfen Li,Ji Li,Zhong Cao
Photocatalytic fuel cell as a potential green technology has been widely reported. In this work, MoS 2 /TiO 2 and MoS 2 /Ni foam were successfully synthesized and acted as photoanode and cathode, respectively, the as-prepared photocatalytic fuel cell. After MoS 2 is modified, the modified composite photoanode obtains higher light-harvesting, electron-hole separation efficiency and electron transport efficiency than pure TiO 2 nanorod photoanode. The result indicated that the photocurrent of the MT-3 photoanode is 1.76 times higher than that of pure TiO 2 . The enhanced performance is attributed to the formation of heterojunction between TiO 2 and MoS 2 in reducing the interface charge carrier recombination and improving the light-harvesting compared with bare TiO 2 . The highest value of open-circuit voltage (0.7 V), short-circuit current (1.04 mA •cm −2 ) and actual maximum power density (0.114 mW•cm −2 ) was obtained by the proposed MT-MN PFC. The degradation performance of the proposed PFC system was evaluated by decomposing the model organic pollutants . As the result indicates, the degradation efficiency was 69.16% when rhodamine B (20 ppm, pH=7) was used as the model organic waste.
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JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2020
·Vol. 20
·期 4
·2365-2371
·
IF 1.134
Zeng Bin,Zeng Wujun
A novel reduced graphene oxide graphene-CdS/CuS nanoplate (G-CdS/CuS NP) was fabricated using a microwave method of loading CdS nanoplates onto graphene sheets (G-CdS NP) and subsequent cation exchange between G-CdS NP and Cu(NO3)2. The prepared G-CdS/CuS NP exhibited
excellent photocatalytic activity which was attributed to the synergy between graphene and CdS/CuS NP. The heterostructure in the CdS/CuS NP lead to an efficient charge transport across the interface. Graphene facilitated the transformation of electrons and reduced the recombination of electron–hole
pairs. These results provide a fabrication method for highly active photocatalysts and will lead to future rational design of photocatalytic materials.
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高影响因子
APPLIED SURFACE SCIENCE
·
2013
·
IF 2.112
Weibing Li,Fangxia Hua,Jiguang Yue,Jiwei Li
Metal-semiconductor compounds, such as Ag@AgX (X = Cl, Br, I), enable visible light absorption and separation of photogenerated electron–hole through surface plasmon resonance (SPR) effect. However, the electron–hole generated and separated by light are vulnerable in Ag@AgX phase because of the occurrence of secondary recombined. In order to more effectively utilize the SPR photocatalytic effect, a heterojunction interface electric field was implemented effectively by introducing some cost-effective semiconductor materials with wide band gap to Ag@AgX compound, thereby preventing photogenerated electrons from secondarily compounding with the holes. In this article, by mixing 500 nm diameter ZnO and Ag@AgX compounds with mole ratio 1:1, studies show that 15 min illumination under visible light can complete degradation of rhodamine B (RhB), and indicate a high stability of photocatalytic degradation. Through Mott–Schottky plots and photoinduced I – t curve, the results show that through the ZnO/Ag@AgCl composition, heterojunction interface electric field can be formed effectively, thus increasing the separation efficiency and transfer speed of photogenerated electrons and holes, and improving the photocatalytic performance. Meanwhile, Ag@AgCl can implement the photosensitization of ZnO with high efficiency through SPR effect, which will enlarge the response range of photocatalyst to the visible area.
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高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 9
·2596-2603
·
IF 6.641
Xiaohui Li,Bojana Milićević,Miroslav D. Dramićanin,Xiping Jing,Qiang Tang,Jianxin Shi,Mingmei Wu
Single-component white light phosphors with a broad and full color spectrum are urgently required to overcome residual problems with commercial phosphors. In this paper, we describe how Eu3+, as the dopant of Sr3ZnTa2O9 (SZT), plays an important role in structural modulation (including structural order–disorder and intrinsic oxygen defects), as demonstrated by electronic structural calculations and systematic experiments. Furthermore, 5D0 → 7F2 emission of Eu3+ provides the red component of the emission spectrum and increases the color rendering index of SZT:Eu3+ phosphors. Consequently, the resulting phosphor SZT:10%Eu3+ shows significantly enhanced emission intensity, and its broadband emission covers the entire visible region from 400 nm to 720 nm. A fabricated LED device using a near-ultraviolet 370 nm chip coated with a single-component, the SZT:10%Eu3+ phosphor, shows warm white emission with a high color rendering index (Ra = 82).
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高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 13
·期 2
·766-775
·
IF 5.7
Xue Meng,Zhijun Wang,Xiaoxue Huo,Mingxin Zhou,Yu Wang,Panlai Li
Phosphor-in-glass (PiG) films are thought to be the best color converters for lighting of laser diodes (LDs) because of their better efficiency and outstanding thermal conductivity. Since laser-driven illumination can overcome the limitations of power density at higher incident optical power densities, in this paper, Cr3+-activated oxides were prepared as near-infrared emitters with thermally stable photoluminescence using a practical blade-coating approach. When pumped using a blue laser, the CaZrTaGa0.2Ge0.4Zn0.4O7:0.01Cr3+ PiG film presents a near infrared (NIR) emission band, with a peak at 812 nm and a full width at half maximum (FWHM) of 248.37 nm. Its internal quantum efficiency reaches 90.20% and the emission intensity at 423 K remains at 92.32% of that at room temperature (RT). In addition, when coupled with a blue laser diode (LD), the optical output power of the NIR LD reaches up to 2.07 W mm−2 at an input power of 9 W mm−2, which is significantly higher than the output power of the NIR phosphor-converted light-emitting diodes (pc-LEDs). Thus, this study advances the development of Cr3+ activated oxide-based PiG films with thermally stabilized luminescence properties and confirms their promising applications in laser-pumped dental monitoring and near-infrared high-power illumination.
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LUMINESCENCE
·
2015
·Vol. 30
·期 7
·1071-1076
·
IF 1.518
Lining Sun,Yannan Qiu,Tao Liu,Jing Feng,Wei Deng,Liyi Shi
We used the synthesized dinaphthylmethane (Hdnm) ligand whose absorption extends to the visible-light wavelength, to prepare a family of ternary lanthanide complexes, named as [Ln(dnm) 3 phen] (Ln = Sm, Nd, Yb, Er, Tm, Pr). The properties of these complexes were investigated by Fourier transform infrared (FT-IR) spectroscopy, diffuse reflectance (DR) spectroscopy, thermogravimetric analyses, and excitation and emission spectroscopy. Generally, excitation with visible light is much more advantageous than UV excitation. Importantly, upon excitation with visible light (401–460 nm), the complexes show characteristic visible (Sm 3+ ) as well as near-infrared (Sm 3+ , Nd 3+ , Yb 3+ , Er 3+ , Tm 3+ , Pr 3+ ) luminescence of the corresponding lanthanide ions, attributed to the energy transfer from the ligands to the lanthanide ions, an antenna effect. Now, using these near-infrared luminescent lanthanide complexes, the luminescent spectral region from 800 to 1650 nm, can be covered completely, which is of particular interest for biomedical imaging applications, laser systems, and optical amplification applications. Copyright © 2015 John Wiley & Sons, Ltd.
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高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2024
·Vol. 34
·期 12
·10999-11008
·
IF 2.2
Feng Lijuan,Yuan Xiang,Wang Qingping,Li Weiwei,Hao Li,Su Ling,Jiang Guiquan
Energy transfer (ET)-based ZnGa 2 O 4 :Mn 2+ , Cr 3+ phosphors with the capacity for ratiometric light conversion have been designed. The Mn 2+ and Cr 3+ ions in the ZnGa 2 O 4 :Mn 2+ , Cr 3+ act as ET donors and receptors, respectively, by changing the doping amount of energy receptor Cr 3+ ions, phosphor materials show different emission colors (green to deep red). The relationship between red and green phosphorescence is ratiometric and linear and, when 254 nm excitation is stopped, the phosphor shows a dark green afterglow. This ET-based ratiometric green-to-red light conversion provides a facile, sensitive and selective method for dynamic anti-counterfeiting.
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高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Yun-Di Yue,Chen Sun,Wei-Feng Zhang,Xing-Yu Sun,Yan Du,Hong-Mei Pan,Yue-Yu Ma,Ting-Jiang Yan,Zhi-Hong Jing
By using in situ N-alkylating [(Me) 2 -2,2-bipy] 2+ organic cation as structural-directing agent (SDA), two new types of organic-inorganic hybrid cuprous halides , namely, [(Me) 2 -2,2-bipy]Cu 3 I 5 ( 1 ) and [(Me) 2 -bipy)] 2 Cu 7 Br 9 I 2 (2) , have been solvothermally synthesized and structurally characterized. The compound 1 crystallizes in the monoclinic space group P 2 1 / n (No. 147) and features one-dimensional (1D) anionic [Cu 3 I 5 ] 2- chains separated by [(Me) 2 -2,2-bipy] 2+ cations. The structure of compound 2 contains a 1D [Cu 7 Br 9 I 2 ] 2- anionic chain, which belongs to the first hybrid cuprous halide with mixed halogen elements. The UV–vis absorption optical measurement reveals that the compounds possesses narrow band gaps of 1.95–2.14 eV, which leads to stable photocatalytic degradation activity over organic pollutant under visible light irradiation. The possible photocatalytic mechanism and reason of photochemical stability is also proposed based on experimental results and electronic band structural calculation.
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 30
·17273-17280
·
IF 3.049
Fan Yang,Jun Liu,Xue Jiang,Weiwei Wu,Zhenni Wang,Qi Zeng,Ruichan Lv
Photodynamic therapy (PDT) is a promising and effective method for tumor therapy that relies on the reactive oxygen species (ROS) produced by photosensitizers at specific wavelengths to inhibit tumor cells. Inorganic semiconductive materials are potential photosensitizers that can excellently absorb ultraviolet light to produce ROS to kill cancer cells. However, this strategy is still limited in terms of practical applications due to the weak penetration of ultraviolet light through biological tissue, as well as the hypoxic tumor microenvironment, largely decreasing ROS generation. In this research, novel PDT agents made with mesoporous lanthanide-semiconductor composites are developed to obtain a remarkable amount of generated ROS under near-infrared (NIR) laser irradiation. Due to the larger size (about 120 nm) of the up-conversion material (UCM) used as the substrate, coated with different amounts of semiconductors with mesoporous morphologies, this platform could emit higher blue emission under a 980 nm laser. Meanwhile, both of the semiconductors (SnO2 and TiO2) used have wide absorbance bands in the ultraviolet region, and the ultraviolet fluorescence emitted from the UCM core under NIR laser excitation can be used as the energy donor. Electron transfer processes in SnO2 and TiO2 are generated via the above platforms and produce ROS through photochemical action. Furthermore, the coated semiconductors are mesoporous with larger surface areas (about 302 m2 g−1) and various channels; this is beneficial to obtain enough oxygen to generate more ROS under a hypoxic environment. The PDT efficiency of a typical NaYF4@SnO2 sample is studied using a DPBF detector, in vitro MTT assays, and in vivo tumor inhibition experiments, revealing that this lanthanide-semiconductor platform could be potentially used as a PDT agent under NIR excitation.
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高影响因子
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