Synthesis, Structure, and Luminescence of 2D-Dilute Magnetic Semiconductors:  Zn_1-<i>x</i>Mn<i>_x</i>Se·0.5L (L = Diamines)

Abstract

The two-dimension dilute magnetic semiconductors (2D-DMS) Zn 1 - x Mn x Se·0.5L (L = ethylenediamine or en, 1,3-propanediamine or pda, 1,4-butanediamine or bda, and 1,6-hexanediamine or hda) and their host compounds ZnSe·0.5L were prepared by solvothermal reaction in solvent L at 190 °C. The powder X-ray diffraction patterns of ZnSe·0.5L are indexed as isomorphous orthorhombic lattices, whose constants c increase monotonically from L = en to L = hda. The orthorhombic lattice in ab plane of ZnSe·0.5en is a shrunken 2D superlattice (√3 a × c ) of the (110) plane of hexagonal ZnSe. When Zn 2+ is partly substituted by Mn 2+, Zn 1 - x Mn x Se·0.5L become 2D-DMS. Their photoluminescence (PL) spectra show strong Mn 2+ -related emission peaks at 2.07 eV (600 nm). The Mn content dependence of PL intensity of Zn 1 - x Mn x Se·0.5hda is especially studied, and high intensities are obtained when x < 0.2. For x ≈ 0.2, the PL intensities of Zn 1 - x Mn x Se·0.5L increase from L = en to L = hda, which can be attributed to the formation of Zn/Mn−N bonds and the effective energy transfer routes and radiative recombination of the 3d electron of Mn 2+ within the 2D [Zn 1 - x Mn x Se] layers.