The rather undefined nature of the aggregates also corresponds well with the absorption behavior of PATs 1-3, as there is not a single very sharp absorption forming upon increasing aggregation but rather a strong broadening and fine structuring. This behavior is different from typical J-aggregates, which are more well-defined and possess one distinct and sharp bathochromically shifted maximum. Similar DLS experiments were conducted with aggregated E isomers of PAT 2 and 3, also leading to a consistent picture (see Supporting Information). For PAT 2 smaller average sizes for the aggregates are detected, which are found to be in the range of 100 nm to 600 nm diameters. For PAT 3 sizes are a bit larger on average between 300 nm and 600 nm but are still smaller than for PAT 1. These findings can be directly correlated with the solubility order PAT well.