Tunable structure, morphology of Zn1−xMgxO fine powder prepared by spray pyrolysis method and its luminescence properties

Abstract

In this report, the role of Magnesium on the crystal structure, morphology, and its luminescence properties of Zn1−xMgxO particle were investigated. The Zn1−xMgxO particle was prepared by spray pyrolysis method. The obtained particle was analyzed using XRD, SEM-EDS, and photoluminescence spectroscopy correspondingly for crystal structure, morphology and elemental analysis, and photoluminescence properties due to the presence of magnesium dopant. The XRD results showed that the original structure of the particle is hexagonal wurtzite and change to cubical as the increase of Mg. The a- lattice parameter increased, and c- lattice parameter decreased with increasing the concentration of Mg in wurtzite crystal. The SEM results exhibited different morphology of the resulting particle. The morphology of the sample is dense with wrinkled shape and is changing to spherical as the result of Mg incorporation into the crystal. Photoluminescence study revealed that the addition of Mg affects the existence of new energy state beside native defect of ZnO in between valence and conduction band. The widening of bandgap on Zn1−xMgxO is due to the blue shift of excitonic peak in the excitation spectrum that usually called Burstein-Moss effect.