Preparation of Manganese-doped ZnSe Precursor Nanoribbon Bundles and Investigation of its Magneto-optical Properties

Mn2+-doped ZnSe ethylenediamine-intercalated precursor nanoribbon bundles (MnxZn1?xSe?en3, en=ethylenediamine) were prepared through an improved solvothermal route, which is time-saving and more efficient compared with the traditional route. XPS, TGA, and FESEM were used to characterize morphology and composites of the precursor and it was proved that the doping process was successful. Electron paramagnetic resonance and photoluminescence (PL) spectra were used in a detailed experiment to characterize and study the Mn2+ doping state and Mn2+-Mn2+ interaction in MnxZn1?xSe?en3. Six well-resolved hyperfine lines, which are attributed to the Mn2+ allowed transition imply that the Mn ions were embedded inside MnxZn1?xSe?en3 lattices and partly replaced Zn. As shown in PL spectrum; the introduction of Mn2+ strongly increases the intensity of the PL peak. The internal Mn transition (4T1?6A1), which strongly increases the peak intensity depends on the average number of Mn atoms in the nanoparticals. As the Mn-doped concentration increases, the PL peak intensity is enhanced. A series of samples with different Mn-doping concentrations were prepared and studied. Combining the EPR results with PL spectra of the samples prepared, it is believed that under conditions of heating 40 h at 180 ?C and controlling Mn2+ ion concentration percentage at 2%-3% (x=0.02-0.03) in the compounds, the best doping can be achieved.