December 13, 2019
Dariush Souri

Dariush Souri

Academic rank: Associate professor
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Education: Ph.D in فیزیک
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Faculty: science

Research

Title PH-, microwave irradiation time-, and dopant content- sensitive photoluminescence of pure and Cu-doped ZnSe quantum dots fabricated by rapid microwave activated method
Type Article
Keywords
ZnSe NCs Photoluminescence (PL) pH Microwave irradiation Cu impurity Optical band gap
Journal OPTIK
Researchers Dariush Souri

Abstract

Synthesis and photoluminescence (PL) of colloidal MAA-capped ZnSe and ZnSe:Cu quantum dots (QDs) is investigated here. The size of QDs is varied tunably by changing the pH, MWIR time and Cu dopant percentage. Results show that the as-synthesized ZnSe QDs and doped QDs (dQDs) have similar cubic zinc blend structure. PL properties is synthesis condition-sensitive in which can be controlled by them, suggesting applications in bio-sensors. It was founded that, PL peak positions had red shift and PL intensities increase commonly as pH increases for different MWIR times; relatively such trend could be observed with increase of Cu dopant. It is suggested that MAA dissociates from the ZnSe outer shell at higher pH, resulting in aggregation and loss of solubility and can change the fluorescence of the MAA-capped QDs. Also, Cu ions as doping agent may be the centers of energy transfer role in the lattice. Generally, PL intensity increases slightly by increasing in pH, and MW irradiation time. Linear decremental, non-linear variation, and nonlinear decremental trends of optical gap were identified at different mentioned synthesis conditions, correspondingly. In brief, the studied QDs promises a novel range of green-emission luminescent QDs for development of nano-probes in bio-imaging applications.