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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 Type
Dr Grade
Email
أمل محمد العمري
Al-Amri, Amal M
Researcher
Master
سعود جميل يغمور
Yaghmour, Saud Jameel
Researcher
Doctorate
syaghmour@kau.edu.sa
وليد السيد محمود
Mahmoud, Waleed E
Researcher
Doctorate
w_e_mahmoud@yahoo.com
Files
File Name
Type
Description
32218.pdf
pdf
Abstract
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