Growth and characterization of Zn1-xMgxSe mixed crystals

This paper deals with experimental study of structural and luminescent properties of Zn 1-x Mg x Se mixed crystals in the x range from 0.0 to 0.615. These crystals were grown by the high pressure Bridgman method. X-ray diffraction and high resolution electron transmission microscope measurements reveal that for magnesium concentration lower than about x equals 0.18 Zn 1-x Mg x Se crystallize in sphalerite structure but for higher -- in wurtzite one. The formation of 4H phase and some other polytypes has been found at the composition close to the phase transition. From investigations of luminescence and reflection spectra the dependence of the exciton transition energy on composition has been determined. In-Zn 0.9 Mg 0.1 Se-Au structure has been fabricated. Blue-violet, green and yellow electroluminescence was observed in the temperature range from 40 K to room temperature.