NDLI: Synthesis of ZnSe and ZnSe:Cu quantum dots by a room temperature photochemical (UV-assisted) approach using Na SeO as Se source and investigating optical properties.

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Year: 2016 Volume: 31

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Year: 2008 Volume: 23

Synthesis of ZnSe and ZnSe:Cu quantum dots by a room temperature photochemical (UV-assisted) approach using Na SeO as Se source and investigating optical properties.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Khafajeh, R. Molaei, M. Karimipour, M.
Description	Country affiliation: Iran Author Affiliation: Khafajeh R ( Department of Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran.); Molaei M ( Department of Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran. m.molaei@vru.ac.ir.); Karimipour M ( Department of Physics, Faculty of Science, Vali-e-Asr University, Rafsanjan, Iran.)
Abstract	In this study, ZnSe and ZnSe:Cu quantum dots (QDs) were synthesized using Na SeO as the Se source by a rapid and room temperature photochemical (UV-assisted) approach. Thioglycolic acid (TGA) was employed as the capping agent and UV illumination activated the chemical reactions. Synthesized QDs were successfully characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), photoluminescence (PL) and UV-visible (UV-vis) spectroscopy, Fourier transform-infrared (FT-IR), and energy dispersive X-ray spectroscopy (EDX). XRD analysis demonstrated the cubic zinc blend phase QDs. TEM images indicated that round-shaped particles were formed, most of which had a diameter of about 4 nm. The band gap of the ZnSe QDs was higher than that for ZnSe in bulk. PL spectra indicated an emission with three peaks related to the excitonic, surface trap states and deep level (DL) states. The band gap and QD emission were tunable only by UV illumination time during synthesis. ZnSe:Cu showed green emission due to transition of electrons from the Conduction band (CB) or surface trap states to the T acceptor levels of Cu . The emission was increased by increasing the Cu ion concentration, such that the optimal value of PL intensity was obtained for the nominal mole ratio of Cu:Zn 1.5%.
File Format	HTM / HTML
ISSN	15227235
Journal	Luminescence
e-ISSN	15227243
Language	English
Publisher	Wiley-Blackwell
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Biophysics Discipline Biochemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Biophysics

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