There were also several attempts of our group and colleagues to explain structure-properties relationships in aggregation in Langmuir-Schaeffer materials. Variation in linear dimensions of bulky aromatic or aliphatic substituents in BODIPY core was found to influence excited state behavior in obtained materials. Concentration control was found to influence emission wavelengths of composite systems in OLED emitters, it was also recently shown how structure alterations actually may change steady-state aggregation patterns in thin films. Even though latter publications are dealing with external aggregation facilitation by compression on an air-water interface, synthetic approach to control of aggregate properties is still in emphasis. Switch from this paradigm is complicated while there is lack of systematic investigations of agggregation effects and known direct means to control them.