Jiang, Daixun and Cao, Lixin and Liu, Wei and Su, Ge and Qu, Hua and Sun, Yuanguang and Dong, Bohua (2009) Synthesis and Luminescence Properties of Core/Shell ZnS:Mn/ZnO Nanoparticles. Nanoscale Research Letters, 4 (1). pp. 78-83. ISSN 1931-7573 (Print) 1556-276X (Online)
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In this paper the influence of ZnO shell thickness on the luminescence properties of Mn-doped ZnS nanoparticles is studied. Transmission electron microscopy (TEM) images showed that the average diameter of ZnS:Mn nanoparticles is around 14 nm. The formation of ZnO shells on the surface of ZnS:Mn nanoparticles was confirmed by X-ray diffraction (XRD) patterns, high-resolution TEM (HRTEM) images, and X-ray photoelectron spectroscopy (XPS) measurements. A strong increase followed by a gradual decline was observed in the room temperature photoluminescence (PL) spectra with the thickening of the ZnO shell. The photoluminescence excitation (PLE) spectra exhibited a blue shift in ZnO-coated ZnS:Mn nanoparticles compared with the uncoated ones. It is shown that the PL enhancement and the blue shift of optimum excitation wavelength are led by the ZnO-induced surface passivation and compressive stress on the ZnS:Mn cores.
|Uncontrolled Keywords:||ZnS:Mn/ZnO - Nanoparticles - Core/shell structure - Luminescence - II-VI Semiconductor|
|Subjects:||Material Science > Nanostructured materials|
|Deposited By:||Lesley Tobin|
|Deposited On:||19 Jan 2009 14:10|
|Last Modified:||19 Jan 2009 14:10|
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