In this work we demonstrate the concept of aggregation induced bathochromism (AIB) for redshifting the absorption of photoswitches by self-aggregation (Figure ). To this end we prepared new derivatives 1-3 of PAT and compared them to our original PAT 4. We show that electron-donating groups at the periphery of the chromophore lead to well controllable aggregation behavior in the global minimum E isomeric state in organic solvents. Upon aggregation, the absorption is significantly broadened and bathochromically shifted beyond 1000 nm. Direct excitation with 1020 nm SWIR light induces photoisomerization to the metastable Z isomer, which is not aggregating. As a consequence, the aggregates dissolve and a deep blue solution is obtained. Irradiation of the Z isomer with red or orange light returns the E isomeric state, which forms aggregates again. In this fashion a fully photonic self-aggregation and deaggregation behavior is established that controls reversible formation and dissolution of ca. 500 nm-scale particles with light beyond 1000 nm wavelengths. Additionally, reversible acid base switching between aggregated and dissolved E isomers of PAT 2 as well as pH dependent NIR absorption changes are enabled by introduction of basic aniline moieties.