Polymeric alkoxy PBD [2-(4-biphenylyl)-5-phenyl-1,3,4- oxadiazole] for light-emitting diodes

CS Wang, M Kilitziraki, LO Palsson, MR Bryce, AP Monkman, Ifor David William Samuel

Research output: Contribution to journalArticlepeer-review

60 Citations (Scopus)

Abstract

The syntheses are reported of the title polymeric alkoxyPBD derivative 5 and the dipyridyl analogue 12 using Suzuki coupling reactions of 1.4-dialkoxybenzene-2.5-diboronic acid with 2.5-bis(4-bromophenyl)-1,3,5-oxadiazole. and its dipyridyl analogue, respectively. Thermal gravimetric analysis shows that polymers 5 and 12 are stable up to 370 degreesC and 334 degreesC, respectively. Films of polymer 5 spun from chloroform solution show an absorption at lambda (max) = 367 nm, and a weaker band at 312 nm, and strong blue photoluminescence at lambda (max) = 444 nm. The photoluminescence quantum yield (PLQY) was found to be 27 +/- 3 %. For polymer 12. the absorption spectra reveal bands of equal intensity at lambda (max) = 374 and 312 nm, with PL at lambda (max) = 475 nm. Device studies using polymer 12 were hampered by its instability under illumination and/or electrical excitation. Polymer 5 is stable under these conditions acid acts as an efficient electron-transporting/hole-blocking layer. For devices of configuration ITO/PEDOT/ MEH-PPV/polymer 5/Al an external quantum efficiency of 0.26% and brightness of 500 cd/m(2) was readily achieved: orange emission was observed, identical to the MEH-PPV electroluminescence.

Original languageEnglish
Pages (from-to)47
Number of pages47
JournalAdvanced Functional Materials
Volume11
Publication statusPublished - Feb 2001

Keywords

  • ANTHRACENE-BASED DYES
  • CONJUGATED POLYMERS
  • ELECTROLUMINESCENT PROPERTIES
  • NAPHTHYLETHENYL SUBSTITUENT
  • ORGANIC MATERIALS
  • EMISSIVE LAYER
  • SIDE-CHAIN
  • DEVICES

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