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Solvothermal Synthesis and Photoluminescence Properties of ZnS:Mn2+/ZnO Core–Shell Nanocrystals

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High-quality ZnS:Mn2+ and ZnS:Mn2+/ZnO core–shell nanocrystals (NCs) were synthesized via a solvothermal method, and characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), ultraviolet-visible (UV-vis) and photoluminescence (PL) spectra. Compared with the bare ZnS:Mn2+ NCs (10 nm), the obtained ZnS:Mn2+/ZnO core–shell NCs have a smaller size (4 nm) and better dispersion, which could be attributed to the added ammonia that adsorbed on the surface of ZnS nuclei and hindered their further growth. From the PL spectrum of ZnS:Mn2+ NCs, orange luminescence at about 595 nm is observed, which is attributed to the 4T16A1 transition of the Mn2+. Meanwhile, the PL intensity of the ZnS:Mn2+/ZnO core–shell NCs is enhanced, and the emission peak is shifted from 595 to 581 nm. The enhancement of the PL intensity is due to the elimination of the surface defects after the growth of the ZnO shell on ZnS:Mn2+ NCs, while the peak blue shift is mainly ascribed to the stress from the mismatch of lattice constants between ZnS and ZnO NCs.
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Keywords: CORE-SHELL; NANOCRYSTALS (NCS); PHOTOLUMINESCENCE; SOLVOTHERMAL

Document Type: Research Article

Publication date: 2010-03-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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