Optical properties of thin film of CdSe/CdS/ZnS quantum dots capped with oleic acid
A J Al-Alwani,1,2, V N Mironyuk,1, О.А.H Hassoon1 & E G Glukhovskoy1
1Saratov State University, Saratov, Russia
2Ibn Khaldun University College, Baghdad, Iraq
Abstract
The formed monolayer and deposited thin film of CdSe/CdS/ZnS quantum dots on silicon substrate was prepared using Langmuir Blodgett method. The optical properties of CdSe/CdS/ZnS quantum dots capped with oleic acid (OA) were studied using PL spectra, determination using the NT-MDT Ntegra Spectra nanolaboratory (Russia), luminescence (PL) was excited by a laser with a wavelength of 473 nm and an optical power of 10 mW. The laser spot diameter is about 300 nm, the exposure time is 1 s. The spectral resolution is 0.33 nm. The intensity of the PL growth peak increases by more than 4 times after the solution is heated to 60 oC and purified from excess surfactants of oleic acid (Fig.1 peak “b”). In this case, a blue shift takes place in the PL peak by several nanometers. The observed “blue shift” of the PL peak after purification can be explained by a changing in the shell thickness of quantum dots during the removal of excess oleic acid.
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Speaker
Al-ALwani Ammar Jaber
Saratov State University
Russia
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