Optical and Electron Paramagnetic Resonance Spectroscopies of Mn-Doped PbS Nanocrystals

Mn-doped PbS nanocrystals (NCs) (Pb
₁
-xMn
_x
S) embedded in glass matrix have been successfully synthesized by means of fusion method. The geometrical morphology and size dispersion of Pb
_1-x
Mn
_x
S NCs were studied by atomic force microscopy (AFM). Their magnetic and the optical properties have been investigated using electron paramagnetic resonance (EPR) and optical absorption (OA) measurements. We found that the isolated Mn
²⁺
-ions are located on the PbS NC-shell whereas coupled Mn
²⁺
-ions are located on the Pb
_1-x
Mn
_x
S NC-core