Abstract
Doping of ZnO nanostructures offers a highly controllable platform for modifying emitted color lines. Improving the luminescence quality of ZnO NRs by doping with different dopants has led to many new applications in optoelectronics. The emitted color lines in ZnO can be effectively controlled by introducing defects which may be distributed over a relatively wide range. Herein, we demonstrate a new method to achieve spectrally stable blue emission from ZnO NRs. We discuss the contribution of ZnO in the observed luminescence and specifically the enhancement in violet-blue emission due to Mg doping in ZnO NRs. Doping ZnO NRs with Mg increased the external quantum efficiency by 100% and increased the color rendering index, which suggests that the quality of light generated by the Schottky LEDs can be tuned by selecting an appropriate dopant. A new strategy indicates that Mg doping plays a significant role in improving the EQE and luminescence quality of LEDs by introducing a highly efficient and spectrally stable blue emission.