Luminescence and scintillation properties of Lu 3 Al 5 O 12 nanoceramics sintered by SPS method
Autor: | Dalibor Pánek, Vladimir Babin, Akihiko Ito, Shunsuke Kurosawa, Alena Beitlerova, Jan Bárta, Romana Kucerkova, Václav Čuba, Takashi Goto, Eva Mihokova, Martin Nikl, Akihiro Yamaji, Akira Yoshikawa, Jan Pejchal |
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Rok vydání: | 2016 |
Předmět: |
Materials science
Photoluminescence Analytical chemistry Spark plasma sintering Mineralogy 02 engineering and technology Scintillator 01 natural sciences Inorganic Chemistry chemistry.chemical_compound Lutetium aluminium garnet 0103 physical sciences Ceramic Physical and Theoretical Chemistry Electrical and Electronic Engineering Spectroscopy 010302 applied physics Scintillation Organic Chemistry Radioluminescence 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials chemistry visual_art visual_art.visual_art_medium 0210 nano-technology Luminescence Computer Science(all) |
Zdroj: | Optical Materials. 53:54-63 |
ISSN: | 0925-3467 |
DOI: | 10.1016/j.optmat.2016.01.024 |
Popis: | Ce-doped lutetium aluminum garnet Lu3Al5O12 (LuAG) nanoceramics were fabricated at 1600 °C and 1700 °C by spark-plasma sintering (SPS) method from nano-powders prepared by radiation synthesis. Both undoped and Ce-doped LuAG ceramic samples were also prepared from the nano-powders at 1700 °C with significantly increased pre-heating rate. The backscattered electron images revealed large amount of pores in all the Ce-doped samples causing their significant opacity. On the other hand, very large grains and no pores were revealed in the undoped sample, which was the only transparent one. The radioluminescence measurements revealed superior overall scintillation efficiency of the samples sintered at the temperature 1700 °C, and their defect emission in the UV region was ascribed to oxygen-vacancy-related defects such as F+ centers. The photoluminescence decay of the defect emission was characterized by an extremely fast decay time of a few nanoseconds. Influence of sintering procedure and subsequent annealing on the luminescence and scintillation properties is discussed. |
Databáze: | OpenAIRE |
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