Synthesis and Luminescence Properties of Core/Shell ZnS:Mn/ZnO Nanoparticles
<p>Abstract</p> <p>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 Zn...
| Published in: | Nanoscale Research Letters |
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| Main Authors: | , , , , , , |
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2008-01-01
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1007/s11671-008-9205-6 |
| Summary: | <p>Abstract</p> <p>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.</p> |
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| ISSN: | 1931-7573 1556-276X |