Full-color electroluminescence from ZnO-based heterojunction diodes

Abstract

Red, green, and blue electroluminescence have been observed from ZnO-based heterojunction diodes consisting of n-ZnO∕n-MgyZn1−yO∕Zn1−xCdxO∕p-SiC layers. The heterostructures were grown by remote-plasma-enhanced metal-organic chemical vapor deposition. The rectifying I-V characteristics at room temperature reveal the red, green, and blue wavelengths near 720, 520, and 480nm, respectively, when the diodes are forward biased. It is observed that the emission color can be controlled by changing the cadmium content in the emission layer.