Abstract

Abstract The point of this article is to investigate under what conditions the sum of a donor transition of an impurity ion, Mn+ → M(n+1)+ + e(CB), and an acceptor transition M(n+1)+ + e(VB) → Mn+ is equal to the band gap of the host. Our recent work on Ti3+, Ti4+ in aluminate host crystals provides the best of the few examples where both a donor and an acceptor transition are known.

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