Polythiophenes as Red-Light Emitters

2 Light-Emitting Thiophene Homopolymers 2.4.2.1 Polythiophenes as Red-Light Emitters 

SCHEME 2.62 Synthesis of alkylthiophenes 397-399 through oxidative iodination of the thiophene followed by Ni-catalyzed polymerization. (From Bolognesi, A., Botta, C., Geng, Z., Flores, C., and Denti, L., Synth. Met., 71, 2191, 1995 Bolognesi, A., Porzio, W., Bajo, G., Zannoni, G., and Fanning, L., Acta Polym., 50, 151, 1999.) 

SCHEME 2.63 Synthesis of alkoxycarbonyl-PTs. (From Pomerantz, M., Yang, H., and Cheng, Y., Macromolecules, 28, 5706, 1995.) 

Jin et al. [487] synthesized and studied the PL and EL properties of polymers 403 and 404 that differ by the position of the alkoxy substituent in the phenyl ring, expecting different distortion of the polymer main chain (and consequently conjugation length) due to different steric factors for para- and ort/zo-substitution (Chart 2.98). The absorption spectrum of the ortho-polymer 403 showed a substantial blue shift of 40 nm compared to para 404 and a decrease in EL turn-on voltage (4.5 and 6.5 V, respectively). Both polymers demonstrated nearly the same PL and EL maxima (Table 2.1). 

Properties of Poly(3-/ )thiophenes, Prepared by the Ulmann (Cu), Yamamoto (Ni), or FeCI3 Polymerization 

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See also in sourсe #XX -- [ , , ]

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