Abstract
For Cr 3+ ions in crystalline hosts, in which the 4T 2 level is at lower energy than 2E, the variation in τ, the observed lifetime, should provide a measure of the variation in quantum efficiency. This is not the case for Cr 3+ ions in glass; in glass the quantum efficiency falls with increasing temperature much more rapidly than the average lifetimes <τ>. We show that this is caused by the occurence in glass of Cr 3+ ions with distinctly different non-radiative rates. We investigate this effect to see if it can provide information about the distribution of non-radiative among the Cr 3+ ions.
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