An ODMR study at 1.6K shows that the 3.4 eV luminescence of Y 2 O 3 originates in a triplet state. The results are consistent with an intrinsic trapping mechanism for excitons. The nature of the trapping mechanism is discussed. Results of an ODMR study of SC 2 O 3 are also reported, using the 3.6 eV luminescence.
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Hayes et al. (1984) studied this question.
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