Graduate J-aggregation and H-aggregation differences

[Sciencestd]

Why J-aggregation has red shift and H-aggregation has blue shift what is the physics behind it? And the second question is does J-aggregate can makes with another J-aggregate H-aggregate?? (I'm new in this topic)

 

[azntoon]

The difference in the energy levels of J-aggregates and H-aggregates is due to the fact that the J-aggregates are composed of molecules with lower energy states than those of the H-aggregates. In J-aggregates, the molecules form a lattice structure which restricts the movement of electrons, resulting in a red-shift in their optical spectrum. In H-aggregates, the molecules have higher energy states, allowing them to move more freely and absorb higher-energy photons, resulting in a blue-shift in their optical spectrum.No, J-aggregates cannot be used to create H-aggregates. The molecules in J-aggregates have lower energy states than those of the H-aggregates, and thus cannot be used to create an H-aggregate.