Mn-DOPED CdSSe TERNARY SEMICONDUCTOR NANOCRYSTALS: STRUCTURE, OPTICAL PROPERTIES AND ENERGY TRANSFER

Abstract

This paper presents the results of fabrication of CdSSe semiconductor nanocrystals (NCs) doped with Mn²⁺ ions with varying concentrations (0-5%) by wet chemical method. The optical properties and structural of the CdSSe NCs were investigated by changing the S/Se ratio. The fabricated CdSSe NCs have a cubic structure. The presence of elements and their compositions in the samples were determined through energy dispersive spectroscopy (EDX). The luminescence properties of the Mn-doped CdSSe NCs were investigated through photoluminescence spectroscopy (PL). Emission spectra of the Mn-doped CdSSe NCs located in the visible light region with two characteristic emission peaks at wavelengths of 426-436 nm and 584-587 nm, respectively. Two emission peaks correspond to the emission of the CdSSe host and the emission of Mn²⁺ ions (corresponding to the energy transition ⁴T₁-⁶A₁). The energy transfer process from the host to the impurity and the efficiency of this process have been studied and determined. The Mn-doped CdSSe NCs have a much longer lifetime than the undoped CdSSe NCs, giving them great potential for applications in solar cells and biomarkers.