Photoluminescence decay kinetics of ZnO: Mn nanobelts

Abstract

Zinc oxide Mn doped nanobelts have been synthesized by chemical precipitation technique using zinc acetate and manganese acetate as a starting material. Electron microscopy observations indicate that the length of nanobelts are ranging from 100μm to 200μm. X-Ray diffraction pattern confirms the wurtzite structure. Nitrogen laser having high peak power (1MW), pulsed (5-7ns) and (λ =337.1nm) has been used for the time resolved luminescence studies and spectroflourometer for steady state photoluminescence measurements. From the decay curves of time resolved laser induced photoluminescence various important optical parameters such as excited state life time, trap depth value, decay constant and integrated cross section and dipole moment have been calculated and reported in this paper. Einstein's spontaneous and stimulated coefficient values obtained from decay curves indicate the probability of transitions from various traps. Selective excitation of the levels can make ZnO a best suited laser medium. Various parameters have been calculated from recorded luminescence decay curves. Crystallographic and morphological characteristics have been studied using X-Ray diffraction (XRD) and electron microscopy (SEM and TEM). © 2020 Elsevier B.V., All rights reserved.