Synthesis and characterisation of poly(distyrylbenzene-block-hexa(ethylene oxide)) and its fluorinated analogue - Two new block copolymers and their application in electroluminescent devices

Cacialli, F.Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom (författare)

Two new soluble block copolymers are reported in which chromophores and hexa(ethylene oxide) units alternate along the polymer backbone. In polymer 1 the chromophore was the distyrylbenzene unit. The polymer was synthesised via the Wittig reaction and the ionization potential of 5.4 ± 0.2 eV was measured by cyclic voltammetry and photoelectron spectroscopy. Polymer 1 showed a high solid-state photoluminescence efficiency (34%) and was used to make efficient (0.5 cd/A) light emitting diodes (LEDs). Polymer 1 was also used in light emitting cells, these showed luminescence in reverse bias and a reduced turn-on voltage compared to the LEDs. Polymer 2, in which the chromophore was dodecafluoro-distryrylbenzene, was prepared via the Horner-Wittig reaction and showed an ionization potential of 6.25 ± 0.15 eV and a solid-state photoluminescence efficiency of 17%. It was used as electron-conducting layer in a LED but failed to give significant electroluminescence. The optical energy gap for both polymers was 3.0 eV. © 2002 Published by Elsevier Science Ltd.

Feast, W.JamesIRC in Polymer Science and Technology, Department of Chemistry, University of Durham, South Road, Durham DH1 3LE, United Kingdom (författare)
Friend, R.H.Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, United Kingdom (författare)
de Jong, Michel PLinköpings universitet,Tekniska högskolan,Ytors Fysik och Kemi(Swepub:liu)micde23 (författare)
Lovenich, P.W.Lövenich, P.W., IRC in Polymer Science and Technology, Department of Chemistry, University of Durham, South Road, Durham DH1 3LE, United Kingdom (författare)
Salaneck, William RLinköpings universitet,Tekniska högskolan,Ytors Fysik och Kemi(Swepub:liu)wilsa67 (författare)
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United KingdomIRC in Polymer Science and Technology, Department of Chemistry, University of Durham, South Road, Durham DH1 3LE, United Kingdom (creator_code:org_t)

Av författaren/redakt...: Cacialli, F.; Feast, W.James; Friend, R.H.; de Jong, Michel ...; Lovenich, P.W.; Salaneck, Willia ...

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