Synthesis and Characterization of High-Quality ZnS, ZnS:Mn2+, and ZnS:Mn2+/ZnS (Core/Shell) Luminescent Nanocrystals
- 23 January 2007
- journal article
- research article
- Published by American Chemical Society (ACS) in Inorganic Chemistry
- Vol. 46 (4), 1354-1360
- https://doi.org/10.1021/ic061917n
Abstract
High-quality ZnS, ZnS:Mn2+, and ZnS:Mn2+/ZnS (core/shell) nanocrystals (NCs) were synthesized via a high-boiling solvent process and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), electron paramagnetic resonance (EPR), X-ray photoelectron spectroscopy (XPS), and photoluminescence (PL) spectra. The monodisperse ZnS NCs (size = 8 nm), which self-assembled into several micrometer-sized domains, were achieved by adopting poly(ethylene glycol) (PEG) in the reaction process (without using a size-selection process). The obtained ZnS:Mn2+ and ZnS:Mn2+/ZnS core/shell NCs are highly crystalline and quasimonodisperse with an average particle size of 6.1 and 8.4 nm, respectively. All of the as-formed NCs can be well dispersed in hexane to form stable and clear colloidal solutions, which show strong visible emission (blue for ZnS and red-orange for ZnS:Mn2+ and ZnS:Mn2+/ZnS) under UV excitation. The growth of a ZnS shell on ZnS:Mn2+ NCs, that is, the formation of ZnS:Mn2+/ZnS core/shell NCs, resulted in a 30% enhancement in the PL intensity with respect to that of bare ZnS:Mn2+ NCs due to the elimination of the surface defects.Keywords
This publication has 61 references indexed in Scilit:
- Emission Properties of Manganese-Doped ZnS NanocrystalsThe Journal of Physical Chemistry B, 2005
- Properties of nanocrystalline ZnS:MnJournal of Crystal Growth, 2004
- Improved output coupling efficiency of a ZnS:Mn thin-film electroluminescent device with addition of a two-dimensional SiO2 corrugated substrateApplied Physics Letters, 2003
- Enhancement of photoluminescence in manganese-doped ZnS nanoparticles due to a silica shellThe Journal of Chemical Physics, 2003
- Up-conversion luminescence of in nanoparticlesPhysical Review B, 2001
- Highly Luminescent Monodisperse CdSe and CdSe/ZnS Nanocrystals Synthesized in a Hexadecylamine−Trioctylphosphine Oxide−Trioctylphospine MixtureNano Letters, 2001
- Epitaxial Growth of Highly Luminescent CdSe/CdS Core/Shell Nanocrystals with Photostability and Electronic AccessibilityJournal of the American Chemical Society, 1997
- Synthesis of Size-Selected, Surface-Passivated InP NanocrystalsThe Journal of Physical Chemistry, 1996
- X-ray Photoelectron Spectroscopy of CdSe Nanocrystals with Applications to Studies of the Nanocrystal SurfaceThe Journal of Physical Chemistry, 1994
- Theory, Production and Mechanism of Formation of Monodispersed HydrosolsJournal of the American Chemical Society, 1950