“…It is attributed to aggregation [15][16][17], originating from inter-chain attractions in the p-conjugated systems, or excimer formation by keto defects [18][19][20], inducing an energy transfer of singlet excitons. Since the distance between the polymer chains is expected to be a crucial governing factor for the formation of aggregates [21,22], several researchers have attempted to restrain the green emission by introducing a bulky end group [23] or crosslinkable group [24][25][26]. In conjugated polymers, the molecular architecture strongly influences the microcrystalline organization, to generate the change of the optoelectronic properties [27].…”