LUMINESCENCE PROPERTIES OF MGXZN1-XSE CRYSTALS

The luminescence properties of ZnSe single crystals doped with isoelectronic substituent Mg by a simple diffusion procedure have been studied. It has been shown that Mg easily enters substitutionally on a Zn site forming MgxZn1-xSe mixed crystals with a bandgap energy considerably larger than that of 'pure' ZnSe. The photoluminescence spectrum of such crystals is dominated by blue and violet emission, the efficiency of which is much higher than the efficiency of blue luminescence in ZnSe. Low-voltage blue-violet electroluminescence with maximum emission at 2.98 eV at T = 45 K and 2.875 eV at room temperature in MgxZn1-xSe mixed crystals has been demonstrated, which makes this material very promising for future application in constructing blue and violet light emitting diodes.