Localized-State-Dependent Electroluminescence from ZnO/ZnS Core–Shell Nanowires–GaN Heterojunction

Li, Ruxue; Wei, Zhipeng; Fang, Xuan; Wang, Yanbin; Li, Yongfeng; Wang, Dengkui; Tang, Jilong; Fang, Dan; Chu, Xueying; Ye, Bin; Chen, Rui; Wang, Xiaohua

doi:10.1021/acsanm.8b00123

Cited by 13 publications

(3 citation statements)

References 46 publications

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“…Among the semiconductor based photocatalyst, ZnO and TiO 2 are widely used due to their strong oxidation capacity, chemical stability, non-toxicity, low cost etc. ZnO (3.37 eV) is one of the best alternate semiconductor material for TiO 2 (3.2 eV) as it has similar band gap energy and high quantum efficiency [6][7][8][9][10][11][12][13][14][15][16][17][18] .…”

mentioning

confidence: 99%

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Ganapathy

Harinee

Sridhar

et al. 2020

Sci Rep

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PbS heterojunction were prepared by microwave irradiation to improve the organic pollutants degradation under visible light irradiation. Hexagonal (wurtzite) and cubic crystal structure of ZnO and PbS respectively were confirmed by PXRD. Nano-plate, nano-sponge and nano-sponge imprinted over nano-sheet like morphology of ZnO, PbS and ZnO-PbS respectively were revealed through FESEM analysis. HR-TEM analysis provides the formation of heterojunction. XPS analysis shows the presence of the ZnO-PbS heterojunction. UV-Visible spectroscopy confirms the enhanced visible light response of Zno-pbS heterojunction than the bare Zno. the pL and eiS results indicate ZnO-PbS heterojunction exhibited lowest recombination of excitons and electron transfer resistance. Synergistic effect of ZnO-PbS heterojunction leads to efficient degradation against organic pollutants than bare ZnO and PbS. Aniline and formaldehyde were successfully degraded around 95% and 79% respectively, under solar light irradiation. As-prepared photocatalysts obeys pseudo first order reaction kinetics. HPLC analysis also confirms the successful mineralization of organic pollutants into water and co 2 .Lead sulfide (PbS) has broad spectral response form visible to near-IR region due to its narrow direct band gap (0.41 eV). In recent years, PbS sensitized nanomaterial's are increased the visible light response and photo-conversion efficiencies. It has unique photo physical properties such as multi exciton generation (MEG), high absorption coefficients, size dependent optical properties and optoelectronic properties 23,24 .Recently, several methods are adopted for the preparation of ZnO-PbS heterojunction such as chemical bath deposition 25 , ultrasound deposition method 26 , low temperature method 27 , successive Ionic Layer Adsorption and Desorption method 28,29 , Radio Frequency Sputtering 30 and spin coating method 31 . In all the above methods, most of them have some difficulties and limitations to produce ZnO-PbS heterojunction such as long reaction time and cost of the equipment. Therefore, novel techniques required to overcome this problem to prepare the semiconductor coupled ZnO-PbS photocatalyst in large-scale production without any sacrification in efficiency.Microwave irradiation technique is a best alternative heating source for the preparation of nano materials due to its rapid chemical reaction with short span of time when compared to conventional methods. Microwave irradiation involves through dipolar polarization and ionic conduction, which helps for the preparation of nanostructured materials 32 . Microwave method is fast, uniform heat distribution, energy efficient and simple than other conventional methods. The size and morphology of the material can be easily controlled by the microwave parameters such as frequency, time and operating power. Therefore, microwave method is leading technique for homogeneous nucleation and fast crystallization, which leads to the preparation of nano-structured inorganic semiconductor photocatalyst. In recent ...

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mentioning

confidence: 99%

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Ganapathy

Harinee

Sridhar

et al. 2020

Sci Rep

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“…2b). 24,25 Besides, energy-dispersive spectroscopy (EDS) was performed for the characterization of the elemental composition within ZnOS-3. Element mapping confirms that O, S, and Zn elements are uniformly distributed on the nanoparticles (Fig.…”

Section: Synthesis and Characterization Of Znos-xmentioning

confidence: 99%

Collaborative hydrothermal and calcination fabrication of ZnOS heterostructures for visible-light-driven H₂ production

Chen

Lin

Lai

et al. 2023

Phys. Chem. Chem. Phys.

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“…With the development and understanding of solid-state physics and using several luminescence techniques such as cathodoluminescence, polarized luminescence, thermoluminescence etc, various models [19,20] were developed to illustrate electronic transitions and the nature of defects responsible for the luminescence behavior in ZnS. There are several models in the literature like donor-acceptor pair emission [21], emission due to clouds of defects [22], excitonic emission [23], localized state emission [24], emission provided by isoelectronic traps [25] or band edge emission [26]. Also, the ZnS activated with Ag + ions is a leading scintillator material extensively in neutron, α particles and radon detection [27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Induced ageing of ZnS:Ag microparticles exposed to 13 keV electron beam

Scurtu,

Ticos,

Mitu

et al. 2024

Phys. Scr.

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Phosphorescent microparticles made of ZnS:Ag were exposed to pulsed electron beams with an energy of 13 keV for periods of time between 30 minutes and 240 minutes. An XRD analysis showed no modification of crystalline structure. The average cristalites of ZnS:Ag was 62 nm deduced from SEM imaging. The luminescence spectra showed a decreasing activity with 40% after 30 minutes of irradiation at a fluence of 5.79 x 1016 electrons/cm2. The broad peak between 445 nm to 480 nm centered aroud 460 nm with a FWHM almost constant aroud 80 nm show no shifting. After a long exposure (over 240 min) and a fluence of 4.60 x 1017 electrons/cm2, the powder suffered a blackening effect attributed to formation of dead layers under electronic excitation combined with increasing of Sulphur vacancies, quantitatively confirmed by EDS analysis, where the proportion of S in ZnS:Ag decreases from 31.42% to 13.75%. Also, the luminescence at this moment dropped to almost 90% under the electron beam effect. The thermal effect could not be correlated with luminescence quenching, which was attributed to the increase in the number of impurities. 

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Localized-State-Dependent Electroluminescence from ZnO/ZnS Core–Shell Nanowires–GaN Heterojunction

Cited by 13 publications

References 46 publications

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Collaborative hydrothermal and calcination fabrication of ZnOS heterostructures for visible-light-driven H₂ production

Induced ageing of ZnS:Ag microparticles exposed to 13 keV electron beam

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Localized-State-Dependent Electroluminescence from ZnO/ZnS Core–Shell Nanowires–GaN Heterojunction

Cited by 13 publications

References 46 publications

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Microwave assisted synthesis of ZnO-PbS heterojuction for degradation of organic pollutants under visible light

Collaborative hydrothermal and calcination fabrication of ZnOS heterostructures for visible-light-driven H2 production

Induced ageing of ZnS:Ag microparticles exposed to 13 keV electron beam

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Collaborative hydrothermal and calcination fabrication of ZnOS heterostructures for visible-light-driven H₂ production