Abstract:
ZnO ceramic samples of different tellurium impurity are prepared by the uniaxial cold pressing method. The dependence of the optical and X-ray structural properties of zinc oxide ceramics on a tellurium concentration (0–9%) is examined. The annealing at 430$^\circ$C in ZnO:Te ceramics (9%) is shown to generate ZnTeO$_3$ phase, while annealing at 900$^\circ$C leads to the formation of Zn$_3$TeO$_6$ phase at Te content of 3, 7, 9%. Observations of the green luminescence spectrum of ceramics ZnO:Te (annealing at 430$^\circ$C) reveal that a tellurium doping of 1, 3% results in a shift of the spectrum to the long-wave region while at 7, 9% the spectrum returns to its original position. The annealing at 900$^\circ$C causes a substantial shift of the green luminescence spectrum (77 K) to the long-wave range. At 430$^\circ$C annealing, a violet luminescence band flares up, which goes out on annealing at 900$^\circ$C.
Fulltext:
PDF file (500 kB)