INVESTIGATION OF OXYGEN-RELATED DEFECTS IN ZnO:GROWING TIME AND MnCONCENTRATION EFFECTS

Özet

The optical and photoluminescence properties of ZnO nanocrystals synthesized via hydrothermal method are determined in this study. The effect of growing time (1 h, 6 h, 12 h, 24 h and 36 h) and Mn concentration (5x10-4mol, 10x10-4, 25x10-4mol, 75x10-4mol, 100x10-4mol, 250x10-4mol) on these properties are investigated and presented in detail. The ultraviolet–visible (UV-Vis) and photoluminescence (PL) spectroscopy techniques are used for optical and photoluminescence properties characterization. Room temperature PLspectra of the ZnO nanopowders showa nearband-edge emission (peak at 385nm) and a red light emission (peak at 650 nm)for both ZnO synthesized for different growing time and different Mn concentration. The ZnO prepared with 1 h and 12 h includes the lowest oxygen related defects. The ZnO doped with 5x10-4molshows the highest oxygen related defects whereas that of 100x10-4molshows the lowest defects.