The fluorescence properties of bisphenol A polycarbonate (PC) solids w
ere studied in detail as a function of casting and annealing temperatu
res (40-180 degrees C), resulting in the establishment of a method to
measure the pure fluorescence spectrum of PC solids. The spectrum was
subject to contamination by a photoproduct of PC, which was assumed to
have a similar structure to 2,2'-dihydroxydiphenyl. The existence of
an excimer, formed between intermolecular phenyl groups in the PC main
chain, was ascertained, showing that some main chains are located wit
h a distance of 0.35 nm between one another in the amorphous area of P
C solids.