| Abstract: | Delayed emission was observed for alternating and random copolymers of 9-phenanthrylmethyl methacrylate and 2-(9-carbazolyl)ethyl methacrylate with styrene in a rigid solution at 77 K. All the copolymers showed monomeric phosphorescence and delayed fluorescence, indicating the absence of deep trap sites in either the excited singlet or triplet states. The delayed fluorescence was more pronounced for the random copolymers with higher chromophore contents than that for the alternating copolymers. Hence, the interchromophore distance is crucial for efficient triplet-state energy migration. © 1997 John Wiley & Sons, Ltd. |
