▎ 摘　　要

NOVELTY - An azido-containing fluorene-based polymer having structural unit (I), is new. USE - Azido-containing fluorene-based polymer for preparing covalently modified polymeric graphene material for producing solid-state thin-film optical limiter used in optoelectronic device and photovoltaic devices (all claimed). ADVANTAGE - The polymer has excellent aggregation-induced emission characteristics. The graphene composite has excellent solubility, optical properties and charge transport properties, and provides solid-state thin film optical limiter having excellent optical response. DETAILED DESCRIPTION - An azido-containing fluorene-based polymer having structural unit of formula (I), is new.n = not defined. N.B: n is not defined. INDEPENDENT CLAIMS are included for the following: (1) preparation of polymer (I); (2) covalently modified polymeric graphene material of formula (Ia); (3) preparation of polymeric graphene material (Ia), which involves adding the polymer (I) and graphene to N-methylpyrrolidone in an inert gas atmosphere, reacting, separating and purifying; and (4) preparation of solid-state thin film light limiter, which involves adding polymethyl methacrylate powder to an organic solvent, ultrasonically dispersing, mixing resultant with a sample solution obtained by dissolving composite polymeric graphene material in N-methylpyrrolidone, removing air bubbles, slowly pouring the mixed solution on a glass surface dish, leaving for 30 minutes, and drying. A = group of formula (i).