Light emitting polymeric derivatives

Becker et al. (5) prepared polymeric organic light-emitting diodes by copolymerizing 4,7-dibromobenzo[l,2,5]-thiadiazole, (IV), and 4,7-dibromobenzo-furazone, (V), with spirobifluorene derivatives. Polymerizations were performed under Yamamoto conditions. 

Triphenylamine derivatives are known to be efficient hole transport materials and are widely used in organic light-emitting devices. Thelakkat et al. reported the synthesis of a 2,2-bipyridine ligand capped with polyfvinyl-triphenylamine) at both ends.97 The polymer chain was synthesized by the atom transfer radical polymerization of 4-bromostyrene using 4,4-bis (chloromethyl)bipyridine as the initiator (Scheme 18). The bromide groups were then replaced by diphenylamine in the presence of palladium catalyst. Polymer 33 was then obtained by the metalation reaction. 

Two crosslinkable perfluorinated bisphenol A polymeric derivatives having nonlinear optical chromophores containing thiophene have been prepared. Both crosslinked polymers had higher Tg s and greater mechanical stability than their noncrosslinked analogues and were used as light-emitting diodes. 

Oxadiazole derivatives found application for the production of electron transporting material for blended-layer organic light-emitting diodes. Compound 209 was used to enhance electron injection in an emissive polymeric material <05JMAC194>. 

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