Site-selective emission spectra of Eu 3+ -doped CeO 2 nanoparticles up to the 5 D 0 − 7 F 5 transition were recorded under cryogenic conditions to identify the local structure around the Eu 3+ dopants in ceria. It is found that pretreatment conditions are crucial for the redistribution of dopants from a broad variety of environments to six well-defined lattice sites. The influence of the dopant and the host structure on the catalytic activity was investigated. A relationship between structure and reactivity is discussed. It is shown that oxygen transport is most efficient in particles with a pronounced amorphous character.
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