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April 15-16, 2019 | Frankfurt, Germany
Applied Physics & Laser, Optics and Photonics
International Conference on
Materials Science and Nanotechnology | Volume: 3
Structural and optical properties of upconversion CuInS/ZnS quantum dots
Magdy Ali, Jehan El Nady, Shaker Ebrahim
and
Moataz Soliman
Alexandria University, Egypt
A
facile one-pot method to synthesis CuInS/ZnS
(CIS/ZnS) QDs was developed. The prepared
CIS/ZnS QDs exhibit bright emission. Moreover,
the upconversion photoluminescence (PL) of
the CIS/ZnS QDs was explored. Interestingly,
extraordinary excitation-independent emission
for both up and down conversion fluorescence
of the CIS/ZnS QDs were observed. Analysis of
X-ray diffraction (XRD) of CIS/ZnS QDs shows
chalcopyrite crystal structure. The high-resolution
transmission electron Microscopy (HRTEM)
images demonstrated crystalline CIS/ZnS QDs in
spherical shape with average diameter size of 2.5
nm and 3.6 nm for CIS and CIS/ZnS, respectively.
The selected area electron diffraction (SAED)
suggests that the prepared CIS/ZnS QDs are
poly-crystalline with 0.32 nm lattice distance.
The optical properties of CIS and CIS/ZnS QDs
were evaluated. The PL peaks position are almost
constant and exhibit a strong peak at about 640
nm for both up and down conversion emission
with a linear relationship between the intensity
of the PL emission peaks and various excitation
wavelengths.
e
:
igsr.magdyali@alexu.edu.eg