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Open Access Nano Express

Synthesis and Luminescence Properties of Core/Shell ZnS:Mn/ZnO Nanoparticles

Daixun Jiang, Lixin Cao*, Wei Liu, Ge Su, Hua Qu, Yuanguang Sun and Bohua Dong

Author Affiliations

Institute of Materials Science and Engineering, Ocean University of China, Qingdao, 266100, People’s Republic of China

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Nanoscale Research Letters 2008, 4:78-83  doi:10.1007/s11671-008-9205-6

Published: 26 November 2008

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.

Keywords:
ZnS:Mn/ZnO; Nanoparticles; Core/shell structure; Luminescence; II-VI Semiconductor