Luminescence of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>F</mml:mi></mml:math>center in sapphire
K. H. LeeDepartment of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27514J. H. CrawfordDepartment of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27514
1979en
ABI
Abstract
An $F$-center emission band (3 eV) has been observed in subtractively colored ${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$ crystals upon exciting with $F$ light (6.1 eV). The lifetime of the 3 eV luminescence is 36 \ifmmode\pm\else\textpm\fi{} 4 msec. We attribute this long lifetime to the forbidden triplet-to-singlet transition of the $F$ center. The $F\ensuremath{\leftrightarrow}{F}^{+}$ conversion can be shown by studying the $F$ and ${F}^{+}$ emission bands in these crystals.
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