Luminescence of theFcenter in sapphire
作者： K. H. Lee , J. H. Crawford
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摘要: 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 to forbidden triplet-to-singlet transition center. $F\ensuremath{\leftrightarrow}{F}^{+}$ conversion can be shown by studying and ${F}^{+}$ bands these crystals.
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