Abstract
In the present work, photoluminescence and photoluminescence excitation (PLE) spectroscopy have been employed to study d-d and p-d exchange interaction of Mn-doped ZnSe nanocrystals (NCs) from room temperature through 10K. Mn-doped ZnSe NCs of size about 5nm with zinc blend crystal structure are grown by the nucleation doping strategy. The doped-NCs reveal strong Mn-related emission; surprisingly that shows red shift with the decrease in temperature. At 10 K, four different excitation features related to d-d transitions of Mn2+ were observed. Crystal field parameter (Dq) and Racah parameters (B and C) are calculated using low temperature PLE spectra recorded by fixing the Mn2+related orange luminescence emission. Increased covalency of the metal-ligand bond and the enhanced exchange interaction between different d-electrons is found. Increment in covalency and exchange interaction is corroborated by the appearance of broad feature in electron spin resonance spectroscopy.
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