Time resolved spectroscopy of Eu2+ aggregates in the NaCl system — at different stages of the aggregation process — shows a non‐exponential behaviour of time decay signals that is interpreted in terms of excitation migration and up‐conversion processes in a fractal geometry. Following this model, the spectral dimension of such aggregates is obtained from the time decay profiles. The analysis of experimental results suggests a model (fluctuation‐percolation triggered aggregation, FPTA) for the aggregation process.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics