Effect of tellurium impurity on structural and optical properties of ZnO ceramics
Omaev A. K.1, Ataev M. B. 1, Zobov M. E. 1
1Amirkhanov Institute of Physics, Dagestan Scientific Center, Russian Academy of Sciences, Makhachkala, Russia
Email: omaev.67@mail.ru
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 oC in ZnO:Te ceramics (9%) is shown to generate ZnTeO3 phase, while annealing at 900 oC leads to the formation of Zn3TeO6 phase at Te content of 3, 7, 9%. Observations of the green luminescence spectrum of ceramics ZnO:Te (annealing at 430 oC) 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 oC causes a substantial shift of the green luminescence spectrum (77 K) to the long-wave range. At 430 oC annealing, a violet luminescence band flares up, which goes out on annealing at 900 oC. Keywords: Ceramics, photoluminescence, zinc oxide, structures.
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