“…[29][30][31][32][33][34][35][36][37][38] The rigid, bulky and thermally stable aryl imidazole moiety could reduce close packing, increase the chain distance, leading to irregular arrangement, which is conductive to the solvent to pass through. [39][40][41] Moreover, large volume heterocyclic rings is helpful to improve or maintain the thermal stabilities of polyimides. 38,39 However, the uorescence quantum yield of aromatic polyimides is very low, which could not meet the needs of practical application.…”