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Abstract
The dominant flourescence of Fe 3+ in ordered LiAl 5O 8 and LiGa 5O 8 is due to tetrahedral site occupancy. We have observed a very weak flourescence in LiGa 5O 8 due to Fe 3+ in octahedral sites. At low temperatures, the flourescence shows a zero phonon line with vibronic sidebands whose presence is evident even at room temperature. On the other hand. Fe 3+ in octahedral sites of LiAl 5O 8 (in the disordered phase) exhibits a broad band flourescence at room temperature that does not narrow appreciably upon cooling. We attribute this effect to inhomogeneous site broadening.
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