title: Synthesis and Luminescence Properties of Core/Shell ZnS:Mn/ZnO Nanoparticles.
abstract: 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.
authors.affiliation: Institute of Materials Science and Engineering, Ocean University of China, Qingdao, 266100 People's Republic of China.
authors.forename: Daixun
authors.initials: D
authors.lastname: Jiang
authors.forename: Lixin
authors.initials: L
authors.lastname: Cao
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Ge
authors.initials: G
authors.lastname: Su
authors.forename: Hua
authors.initials: H
authors.lastname: Qu
authors.forename: Yuanguang
authors.initials: Y
authors.lastname: Sun
authors.forename: Bohua
authors.initials: B
authors.lastname: Dong