Abstract
Abstract Energy transfer from ligand molecule to ion in rare earth chelates has been assumed to involve a molecular triplet state. 1,2 These triplet states manifest themselves optically as long-lived Tπ, π∗ →Sπ,π emission if the lowest resonance level of the ion is of higher energy than the molecular triplet. 3 If the resonance level lies below the triplet, longlived emission is absent or severely reduced in intensity. 4,5
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