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Electron Transfer between RE3+ Ions in Oxide Hosts: Experiments and Initial Quantitative Analysis

It is known that acceptor ions such as Eu, Yb, and Sm can strongly quench Ce 5d→4f luminescence via electron transfer (ET). Prior work has given estimates for the distance dependence for electron transfer [1] and the extent of quenching for different acceptor ions in the same host (at least for Pr S0 emission [2]). In this presentation, we attempt to expand upon this work by drawing the analogy between molecular/solution based ET [3] and these ET reactions. This quantitative analysis is done using the semi-classical description of ET from Marcus theory [3]: