Abstract
CdSe nano flakes have been synthesized through using the selenium powder and cadmium foil in the ethylenediamine by an elemental direct reaction method. These high-quality CdSe nano flakes, being approximately perpendicular to the cadmium foil substrate, show the hexagonal structure and are characterized with the networking structures. According to Kubelka-Munk method, band gap of CdSe nano flakes can be estimated to be ∼2.44 eV. Multi-peak emissions under the excitation of 325 nm can be observed at room temperature. From green to red, four emissions can be fitted and attributed to the transition of band gap, selenium vacancies, interstitial cadmium, and the surface defects associated with oxygen, respectively. Investigation of multi-peak emission origins as well as understanding and regulating of defect states are helpful for CdSe nano flakes to apply in the field of the optoelectronic devices.
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