ZnO Mn thin films were deposited on glass substrates at

The transmission data was taken with a glass sample as a reference, i.e., the reflection from the substrate was subtracted. In addition, the room temperature photoluminescence spectra were measured using a fluorescence spectrophotometer (Jobin Yvon FL3-21) with Xe lamp (450 W) as light source excited at 325 nm. Also, the impedance measurements were recorded out in the frequency range (5 Hz–13 MHz) at various temperatures (578–638 K), using an impedance meter (Hewlett–Packard 4192 analyzer).