Resonant tunneling light emitting diode based on rock-salt ZnO/MgO multiple quantum well

The rock-salt structure ZnO is favorable for optoelectronic applications due to its high symmetry and a promising rock-salt. However, this high-pressure phase is metastable under ambient conditions. This work presents experimental results for rock-salt ZnO/MgO multiple quantum well (RS-MQW) and its resonant tunneling light emitting diode (RTLED). Near ultraviolet and blue-violet electroluminescence centered at 396 nm is observed from the RTLED. The electroluminescence is naked eye visible even at a forward injection current as low as 0.5 mA. The absolute radiation fluxes in the spectral range of 365 nm-465 nm and 390 nm-400 nm reach to 246.6 mu W and 57.0 mu W, respectively, at 10 mA injection current. The luminance of the RTLED is 10643 cd/m2. This work shows an application of rock-salt ZnO in light emitting diodes.