Excitonic luminescence in ZnO nanopowders and ceramics

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• 作者：L. Grigorjeva ; D. Millers ; K. Smits ; V. Pankratov ; W. Ł ; ojkowski ; J. Fidelus ; T. Chudoba ; K. Bienkowski ; C. Monty
• 关键词：Photoluminescence ; ZnO ceramics ; Time-resolved luminescence ; Fast scintillators
• 刊名：Optical Materials
• 出版年：2009
• 出版时间：October 2009
• 年：2009
• 卷：31
• 期：12
• 页码：1825-1827
• 全文大小：373 K

文摘

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 % .