Study of Non Linear optical properties of Fe doped CdSe nanoparticles

Abstract

Fe doped CdSe nanoparticles were synthesized by Co-Precipitation method.  Optical, Structural, Morphological studies were carried out by UV-Vis spectroscopy, Fluorescence spectroscopy, FTIR and Scanning Electron Microscopy (SEM). Inecrease in band gap, fluorescence quenching and red shift of fluorescence peak position was observed with increasing dopant (Fe) concentration in CdSe. Absorption spectra of undoped CdSe, Fe doped CdSe QDs exhibits a blue shift as compared to the bulk CdSe which indicates clearly the quantum confinement effect. The nonlinear optical parameters viz. nonlinear absorption coefficient (β), nonlinear refractive index (n₂) and third order nonlinear susceptibilities (χ³) of quantum dots have been estimated using second harmonic of Nd:YAG laser. The study predicts that CdSe:Fe quantum dots exhibits strong non linearity as compared to core CdSe nanoparticles.