Document Details

Document Type : Article In Journal 
Document Title :
Low temperature growth of metastable cubic CdSe nanocrystals and their photoluminescence properties
Low temperature growth of metastable cubic CdSe nanocrystals and their photoluminescence properties
 
Subject : Physics 
Document Language : English 
Abstract : Metastable cubic CdSe nanocrystals have been synthesized via solution growth technique along the temperature range 5595 °C. The as-synthesized nanocrystals have been characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray (EDX). The results indicated that metastable cubic CdSe with the lattice constant a=0.609 nm is formed. This cubic structure was found preserved at all temperatures growth. HRTEM measurement confirmed the good crystallinity cubic phase of the CdSe NCs with lattice constant a=0.61 nm. The EDX measurement indicated the presence of Cd and Se only with atomic ratio of Cd Se is 0.56:0.44. The optical absorption as a function of the wavelength for the prepared CdSe nanocrystals at different temperatures is investigated. The results indicated the formation of CdSe nanocrystals and their size corresponding to the regime of spatial exciton confinement. The photoluminescence emission intensity for as-synthesized CdSe nanocrystals at different reaction temperatures depicted that at low temperature (55 °C) the emission peak intensity of the CdSe QDs was much larger than the absorption edge, indicating the presence of surface trap-state emissions. These surface crystal defects reduced with the increase in the reaction temperature. 
ISSN : 0022-0248 
Journal Name : Journal of Crystal Growth 
Volume : 334 
Issue Number : 1 
Publishing Year : 1432 AH
2011 AD 
Article Type : Article 
Added Date : Wednesday, February 8, 2012 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
أمل محمد العمريAl-Amri, Amal MResearcherMaster 
سعود جميل يغمورYaghmour, Saud JameelResearcherDoctoratesyaghmour@kau.edu.sa
وليد السيد محمودMahmoud, Waleed EResearcherDoctoratew_e_mahmoud@yahoo.com

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