1. bookVolume 49 (2012): Issue 4 (January 2012)
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18 Mar 2008
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Defect Luminescence of Yag Nanopowders and Crystals

Published Online: 17 Sep 2012
Page range: 54 - 60
Journal Details
License
Format
Journal
First Published
18 Mar 2008
Publication timeframe
6 times per year
Languages
English
Copyright
© 2020 Sciendo

Undoped and rare-earth-ion-doped Y3Al5O12 (YAG) nanopowders are prepared by the sol-gel low-temperature combustion method. The luminescence characteristics of the YAG, YAG: Ce, YAG:Pr, and YAG: Ce/Pr nanopowders are compared with those of the single crystals. The luminescence band peaking around 3.1 eV is complex and excited at about 3.6 eV, 3.9 eV and 4.3 eV. The 3.1 eV emission was peculiar to all the samples studied. The Stokes shift of this band is ~0.5 eV. The decay time of the ~3.1 eV emission at 80 K is ~14 ns and the slower decay (afterglow) components are practically absent. The 3.1 eV luminescence was suggested to arise from different intrinsic lattice defects.

Keywords

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