We report for the first time how the optical transitions associated with localized levels of a rare-earth impurity can be modulated by quantum confinement. The effect of quantum confinement on impurity critically depends on the size of the host crystal. The variation of absorption and luminescence efficiency of Tb3+-ion doped Y2O3 is discussed within the framework of the quantum confined atoms.
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Bhargava et al. (1998) studied this question.