Synthesis and Characterization of High-Quality ZnS, ZnS:Mn2+, and ZnS:Mn2+/ZnS (Core/Shell) Luminescent Nanocrystals

Zewei Quan,† Zhenling Wang,† Piaoping Yang,† Jun Lin,*† and Jiye Fang‡
Key Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China, Graduate School of the Chinese Academy of Sciences, Beijing 100049, People's Republic of China, and Department of Chemistry, State University of New York at Binghamton, Binghamton, New York 13902-6000
Inorg. Chem., 2007, 46 (4), pp 1354–1360
DOI: 10.1021/ic061917n
Publication Date (Web): January 23, 2007
Copyright © 2007 American Chemical Society
†

 Changchun Institute of Applied Chemistry, and Graduate School of the Chinese Academy of Sciences.

,
*

 To whom correspondence should be addressed. E-mail:  jlin@ciac.jl.cn.

,
‡

 State University of New York at Binghamton.

Abstract

Abstract Image

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.

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  • Published In Issue February 19, 2007
  • Received October 7, 2006

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