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Excitonic luminescence in ZnO nanopowders and ceramics |
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| Authors: | L Grigorjeva D Millers K Smits V Pankratov W &#x;ojkowski J Fidelus T Chudoba K Bienkowski C Monty |
| Affiliation: | aInstitute of Solid State Physics, University of Latvia, 8 Kengaraga, LV-1063 Riga, Latvia;bInstitute of High Pressure Physics, Polish Academy of Science, Warsaw, Poland;cCNRS Processes, Material and Solar Energy Laboratory (PROMES), BP5 Odeillo, France |
| Abstract: | Fast photoluminescence spectra in the spectral region of 3.1–3.45 eV in ZnO and ZnO:Al ceramics were studied at 14 and 300 K. Ceramics with grains smaller than 100 nm were sintered from nanopowders by high pressure (8 GPa) and low temperature (350 °C). Ceramics with grain sizes 1–5 μm were sintered at 1400 °C. It is shown that excitonic luminescence spectra depend on the ceramics grain size, post preparing annealing and doping. The excitonic luminescence decay time was faster than 2 ns and the afterglow at 30 ns was  0.05%. |
| Keywords: | Photoluminescence ZnO ceramics Time-resolved luminescence Fast scintillators |
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