Abstract J-aggregate formation of dyes in the Langmuir–Blodgett (LB) films was examined.
UV illumination of a single-layer LB film of an amphiphilic spiropyran caused the photoisomerization of spiropyran into merocyanine, followed by the formation of J-aggregates of merocyanine.
A large morphological change accompanied the J-aggregation.
Alternate illumination of mixed LB films of dyes and azobenzene triggered the formation of J-aggregates of dyes in the films irrespective of whether the dyes were photochromic or not.
The J-aggregation of this type was also accompanied by large morphological changes.