“…Amongst the numerous heterocyclic organic luminescent materials, pyrazoline and its derivatives have received increasing attention due to their excellent electro-optical properties [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ] and wide range of applications. For example, they are used in fluorescent probes, organic light-emitting diodes, and many other materials [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Generally, pyrazoline and its derivatives display strong emission in dilute solutions, but their emission efficiencies can dramatically decrease in the solid state (e.g., in high concentration in solution, in the aggregated state, as a powder, film, or single crystal) due to strong intramolecular and/or intermolecular interactions between neighboring molecules.…”