Synthesis and luminescence properties of ZnS:Mn/ZnS core/shell
Daixun Jiang Æ Æ Lixin Cao Æ Æ Ge Su Æ Æ Wei Liu Æ Æ
Hua Qu Æ Æ Yuanguang Sun Æ Æ Bohua Dong
Received: 21 November 2008/Accepted: 23 February 2009/Published online: 19 March 2009
? Springer Science+Business Media, LLC 2009
solvothermal method were successfully coated with ZnS
shells of various thicknesses. The powder X-ray diffraction
(XRD) measurements showed the ZnS:Mn nanorods were
wurtzite structure with preferential orientation along c-axis.
Transmission electron microscopy images (TEM) revealed
that the ZnS shells formed from small particles, growing
along a-axis orientation, which was proved by the XRD
measurements. Room temperature photoluminescence (PL)
spectra showed that the intensity of Mn emission first
increased and then decreased with the thickening of the
ZnS shells. The effects of ZnS shells on the luminescence
properties of ZnS:Mn nanorods is discussed.
Nanoscale semiconductor materials doped with impurities as
activators have been the subject of an extensive research
commercial devices [1–5]. The doping ions act as recombi-
nation centers for the excited electron-hole pairs and play an
influential role in determining optical properties, resulting in
II–VI compound semiconductors, ZnS is particularly suitable
for use as luminescent host materials for a variety of dopants
duetoits wide bandgapenergyat roomtemperature.One can
easily achieve photoluminescence (PL) at different wave-
10]. Among them, Mn-doped ZnS nanocrystals have been
given much more research attention, mainly because of their
promising applications. Unfortunately, a large portion of
atoms are located on or near surfaces because of their high
surface-to-volume ratio arising from the small particle size.
This causes the surface states to act as luminescent quenching
centers, resulting in low luminescence efficiency. In order to
conquer such serious shortcomings, accordingly, core/shell
structural nanomaterials have been developed and shown
been observed in ZnS:Mn/SiO2nanoparticles , ZnS:Mn/
ZnS nanocrystals , ZnS:Mn/ZnO nanoparticles , and
As mentioned above, a great deal of effort has been
devoted to the spherical core/shell structural nanocrystals,
and researches on one-dimensional nanostructures, such as
nanorods, nanotubes, nanowires, are infrequent. The PL
properties of nanorods differ significantly from those of
spherical nanocrystals. Compared with spherical nano-
crystals, nanorods feature higher PL quantum efficiency,
highly polarized PL, and significantly faster carrier relax-
ation . One-dimensional nanostructures have also
become the focus of intensive research owing to their
unique applications in fabrication of nanoscale devices .
In this article a convenient route to fabricate core/shell
structural ZnS:Mn/ZnS nanorods is reported, and the
impact of ZnS shells on the luminescence properties of
Mn-doped ZnS nanorods is well studied.
All the reactants and solvents used in this work were of
analytical grade and used without any further purification.
D. Jiang ? L. Cao (&) ? G. Su ? W. Liu ? H. Qu ? Y. Sun ?
Institute of Materials Science and Engineering, Ocean University
of China, Qingdao 266100, People’s Republic of China
J Mater Sci (2009) 44:2792–2795