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1 December 1997 Synthesis and electroluminescence of novel DSB-segmented copolymers of the PAV/PPV type
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In this paper our recent advances in the development of a novel class of highly efficient DSB-segmented copolymers 1-5 are reported. (-Y-C6H4-CH equals CH-C6H2(OR)2-CH equals CH-C6H4)n (1): Y equals NC6H5 (2): Y equals O (3): Y equals CO (4): Y equals CHOH (-Y-C6H4- CH equals CR'-C6H4-CR' equals CH-C6H4-)n (5): Y equals NC6H5 R' equals CH3OC6H4. 1,2,3 have successfully been synthesized using the HORNER/WITTIG carbonyl olefination of appropriate dialdehydes which are based on triphenylamine, diphenylether, and diphenylketone. 4 was prepared by polymer analogous carbonyl reduction of 3. This approach resulted in high molecular and soluble materials exhibit green (1,3) and blue (2,3) luminescence with an excellent photoluminescence efficiency. Our goal in this paper is to illustrate the changes in the electrooptical properties that have been caused by segmentation of the polyconjugated PPV backbone into distyrylbenzene (DSB) segments which are connected by mono-atomic Y groups. The chemical character of Y determines significantly the oxidation potentials. Due to its low and reversible oxidation potential 1 shows the most favorable properties for low voltage LED's: green electroluminescence with luminance in the range of 100-500 cd/m2 at 7-10 V has been demonstrated. There has also been prepared an electron donating polymer 5 having additional phenyl substituents attached to the vinylenic unit. These phenyl groups are responsible for high glass transition temperature and helped to solubilize the chain.
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Hans-Heinrich Hoerhold, Henning Rost, Annett Teuschel, Willi Kreuder, and Hubert Spreitzer "Synthesis and electroluminescence of novel DSB-segmented copolymers of the PAV/PPV type", Proc. SPIE 3148, Organic Light-Emitting Materials and Devices, (1 December 1997);

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