A sol–gel method for preparing ZnO quantum dots with strong blue emission

Chen, Zhong; Li, Xiao Xia; Du, Guoping; Chen, Nan; Suen, Andy Y.M.

doi:10.1016/j.jlumin.2011.05.009

Cited by 51 publications

(15 citation statements)

References 37 publications

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“…Syntheses of Pure ZnO QDs and Ag@ZnO Hybrid Nanodots : Similar to previous reports, pure ZnO QDs were synthesized through a simple wet chemical method with zinc acetate dihydrate (ZnAc 2 •2H 2 O, analytical reagent) and sodium hydroxide (NaOH, analytical reagent) as reaction precursors. First, ZnAc 2 and NaOH ethanol solutions, with respective molar concentration of 20 × 10 −3 and 500 × 10 −3 m , were prepared.…”

Section: Methodsmentioning

confidence: 99%

Enhanced Electroluminescence from ZnO Quantum Dot Light‐Emitting Diodes via Introducing Al₂O₃ Retarding Layer and Ag@ZnO Hybrid Nanodots

Yang

et al. 2017

Advanced Optical Materials

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Short‐wavelength light‐emitting diodes (LEDs), a prevalent research topic in modern optoelectronics, have attracted considerable attention in recent years because of their vast application potential in both civil and military domains. Herein, blue‐violet LEDs are constructed via a spin‐coating solution‐processed ZnO quantum dots (QDs) onto p‐GaN: Mg wafers. By inserting a thin Al2O3 dielectric retarding layer into the ZnO QDs side, electrons injected from ITO cathode are effectively slowed and detained in the QDs emissive layer, resulting in a ≈30‐fold improvement of near‐UV electroluminescence intensity from this p‐GaN/ZnO QDs/Al2O3/ZnO QDs LED. Furthermore, by replacing pure ZnO QDs with Ag@ZnO hybrid nanodots (synthesized through a simple one‐step wet chemical route) as the electron transport layer, the device electroluminescence intensity is further increased. Time‐resolved and temperature‐dependent spectroscopy reveals that both the spontaneous emission rate and internal quantum efficiency of the ZnO QDs active layer are simultaneously increased as a result of the exciton‐localized surface plasmon resonant coupling, which leads to the observed blue‐violet electroluminescence enhancement.

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Section: Methodsmentioning

confidence: 99%

Enhanced Electroluminescence from ZnO Quantum Dot Light‐Emitting Diodes via Introducing Al₂O₃ Retarding Layer and Ag@ZnO Hybrid Nanodots

Yang

et al. 2017

Advanced Optical Materials

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“…Moreover, the Brownian movement was decelerated at lower reaction temperatures, and this also restricted the growth rate of the ITO crystals because of lower chance of ionic or molecular collision. 17 Figure 2(b) shows that a higher temperature of 70 C favored the growth of the crystalline nucleates, and the ITO nanoparticles exhibited a rodlike structure with a size 20-30 nm in diameter, and 60-100nm in length. As shown in Figure 2(c), the ITO particles tended to aggregate severely because of their faster growth rate when the temperature was up to 90 C. On the basis of the previous analytical results, a reaction temperature of 70 C was selected for the experiments; this temperature favored both nucleation and the growth of the crystal nucleus.…”

Section: Article Wileyonlinelibrarycom/appmentioning

confidence: 99%

Fabrication and properties of nano indium tin oxide/wool keratin composites

Wen

et al. 2013

J of Applied Polymer Sci

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A functional keratin/indium tin oxide (ITO) composite was prepared by a route involving an ionic liquid dissolving process and a wet-chemical codeposition technique. The crystal structure and morphology of ITO were investigated by X-ray diffraction and transmission electron microscopy, respectively. The factors influencing the crystal structure and the size of the ITO were investigated in detail. The optimal In/Sn ratio, reaction temperature, and pH value were found to be 10:1, 70 C, and 7, respectively. The sheet resistance of the composite reached 0.39 kX/ w . In addition, the composite films possessed a perfect UV protection ability with a UV protection factor of up to 43.78.

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“…Therefore, such systems are becoming more and more important in materials science and being used as photo-catalysts, solar cells and gas sensors 5 6 7 8 9 . There are several methods reported in the literature for the synthesis of undoped and doped ZnO nanoparticles which can be categorized into either chemical or physical methods 10 11 such as sol-gel method 12 , solvothermal 13 and co-precipitation method 14 . Among the various methods, co-precipitation is one of the most important methods to prepare the nanoparticles.…”

mentioning

confidence: 99%

In vitro antibacterial activity of ZnO and Nd doped ZnO nanoparticles against ESBL producing Escherichia coli and Klebsiella pneumoniae

Hameed¹,

Karthikeyan²,

Ahamed

et al. 2016

Sci Rep

311

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Pure ZnO and Neodymium (Nd) doped ZnO nanoparticles (NPs) were synthesized by the co-precipitation method. The synthesized nanoparticles retained the wurtzite hexagonal structure. From FESEM studies, ZnO and Nd doped ZnO NPs showed nanorod and nanoflower like morphology respectively. The FT-IR spectra confirmed the Zn-O stretching bands at 422 and 451 cm−1 for ZnO and Nd doped ZnO NPs respectively. From the UV-VIS spectroscopic measurement, the excitonic peaks were found around 373 nm and 380 nm for the respective samples. The photoluminescence measurements revealed that the broad emission was composed of ten different bands due to zinc vacancies, oxygen vacancies and surface defects. The antibacterial studies performed against extended spectrum β-lactamases (ESBLs) producing strains of Escherichia coli and Klebsiella pneumoniae showed that the Nd doped ZnO NPs possessed a greater antibacterial effect than the pure ZnO NPs. From confocal laser scanning microscopic (CLSM) analysis, the apoptotic nature of the cells was confirmed by the cell shrinkage, disorganization of cell wall and cell membrane and dead cell of the bacteria. SEM analysis revealed the existence of bacterial loss of viability due to an impairment of cell membrane integrity, which was highly consistent with the damage of cell walls.

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A sol–gel method for preparing ZnO quantum dots with strong blue emission

Cited by 51 publications

References 37 publications

Enhanced Electroluminescence from ZnO Quantum Dot Light‐Emitting Diodes via Introducing Al₂O₃ Retarding Layer and Ag@ZnO Hybrid Nanodots

Enhanced Electroluminescence from ZnO Quantum Dot Light‐Emitting Diodes via Introducing Al₂O₃ Retarding Layer and Ag@ZnO Hybrid Nanodots

Fabrication and properties of nano indium tin oxide/wool keratin composites

In vitro antibacterial activity of ZnO and Nd doped ZnO nanoparticles against ESBL producing Escherichia coli and Klebsiella pneumoniae

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A sol–gel method for preparing ZnO quantum dots with strong blue emission

Cited by 51 publications

References 37 publications

Enhanced Electroluminescence from ZnO Quantum Dot Light‐Emitting Diodes via Introducing Al2O3 Retarding Layer and Ag@ZnO Hybrid Nanodots

Enhanced Electroluminescence from ZnO Quantum Dot Light‐Emitting Diodes via Introducing Al2O3 Retarding Layer and Ag@ZnO Hybrid Nanodots

Fabrication and properties of nano indium tin oxide/wool keratin composites

In vitro antibacterial activity of ZnO and Nd doped ZnO nanoparticles against ESBL producing Escherichia coli and Klebsiella pneumoniae

Contact Info

Product

Resources

About

Enhanced Electroluminescence from ZnO Quantum Dot Light‐Emitting Diodes via Introducing Al₂O₃ Retarding Layer and Ag@ZnO Hybrid Nanodots

Enhanced Electroluminescence from ZnO Quantum Dot Light‐Emitting Diodes via Introducing Al₂O₃ Retarding Layer and Ag@ZnO Hybrid Nanodots