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IJSTR >> Volume 5 - Issue 1, January 2016 Edition



International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616



Colloidal Synthesis And Characterization Of Cdse Quantum Dots: Role Of Cd:Se Molar Ratio And Temperature

[Full Text]

 

AUTHOR(S)

Hakan Aydın, M. R. Karim, Mesut Balaban, Hilmi Unlu

 

KEYWORDS

Absorbance, HRTEM, Molar ratio, Photoluminescence, Particle size, Quantum dots, Temperature

 

ABSTRACT

Semiconductor Cadmium selenide (CdSe) Quantum Dots (QDs) were synthesized via colloidal chemistry method at moderately lower growth temperatures. Optical absorption and photoluminescence (PL) spectroscopy techniques were used to characterize the optical properties of CdSe QDs. Optical properties of colloidal CdSe QDs were successfully controlled by changing the initial Cd:Se molar ratios and temperature. Optical absorption and PL spectrum both showed gradual red shift with increasing Cd:Se molar ratio and temperature. High-resolution transmission electron microscopy (HRTEM) technique were used to study the structural properties of CdSe QDs. Full width at half maximum (FWHM) values obtained from the emission spectrums were helped to prove the narrow size distribution, which coincides with the matching results of HRTEM images and theoretical calculations.

 

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