Green Electroluminescence From ZnCdO Multiple Quantum-Well Light-Emitting Diodes Grown by Remote-Plasma-Enhanced Metal–Organic Chemical Vapor Deposition

Zn_0.80Cd_0.20O/Zn_0.92Cd_0.08O multiple quantum-well (MQW) light-emitting diodes (LEDs) on p-type 4H-SiC substrates, using remote-plasma-enhanced metal-organic chemical vapor deposition, have been fabricated and characterized. Band-edge green electroluminescence (EL) at 500 nm has been obtained. The ZnCdO MQW LEDs show a rectifying current-voltage behavior with a turn-on voltage of 6.0 V. The integrated EL intensity linearly increases with increasing injection current density up to 1.9 A/cm². Furthermore, the presence of an EL blue-shift of 20 nm with increasing current and a large EL spectral width in comparison to PL are discussed in terms of Cd compositional fluctuations.