TIAN Xin, CAO Li-xin, LIU Wei, SU Ge, DONG Bo-hua. Synthesis and Photoluminescent Properties of Core/Shell Structure ZnS∶Cu/ZnS Quantum Dots[J]. Chinese Journal of Luminescence, 2012,33(7): 736-741
TIAN Xin, CAO Li-xin, LIU Wei, SU Ge, DONG Bo-hua. Synthesis and Photoluminescent Properties of Core/Shell Structure ZnS∶Cu/ZnS Quantum Dots[J]. Chinese Journal of Luminescence, 2012,33(7): 736-741 DOI: 10.3788/fgxb20123307.0736.
ZnS∶Cu quantum dots have been synthesised via a water-soluble route
then the ZnS shell coated for surface modification. The influence of shell thickness on the optical properties of ZnS∶Cu quantum dots has been studied. The samples were characterized by TEM
XRD
PL
PLE and UV-Vis. The results showed that the ZnS∶Cu/ZnS quantum dots were cubic sphalerite
uniform spherical-shaped and had a narrow size distribution. The average particals size increased from 2 nm to 3.2 nm after the shell modification. The PLE and UV-Vis spectra showed a gradual red shift with the shell thickening
which suggested that the quantum dots was growing with the
n
s
/
n
c
increased. It can proved that the ZnS shell growed on the ZnS∶Cu quantum dots surface and formed the ZnS∶Cu/ZnS core/shell structure quantum dots. The PL intensity related with Cu
2+
increased at the beginning and decreased with further growth of the ZnS shell. The intensity of emission peak achieved the maximum when
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