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The resonant cross relaxations were studied based on the discrete energy transfer model among energy donors (D) and acceptors (A). The D-A pair distribution was found partially segregated and has a cut-off at r 0 for the best-fitting decay curves of the observed fluorescences in Tb 3+ glasses.
We have proposed a new model for the self-concentration quenching effect of luminescence in Tb 3+ ions based on the resonant energy transfers from ( 5 D 3 → 5 D 4 ) to ( 7 F 0 ← 7 F 6 ) within a virtual molecule composed of neighboring two Tb ions, which conserves the total parity with the complete causality.
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