New thermally cross-linkable polymer and its application as a hole-transporting layer for solution processed multilayer organic light emitting diodes

Biwu Ma, Frank Lauterwasser, Lan Deng, C. Sebastian Zonte, Bumjoon J. Kim, Jean Frechet*, Carsten Borek, Mark E. Thompson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

105 Scopus citations

Abstract

A new thermally cross-linkable copolymer containing reactive benzocyclobutene (BCB) units and the well-known hole-transporting moiety N,N′-bis(3-methylphenyl)-N,N′-diphenylbenzidine) (TPD) was synthesized and characterized. Thermal annealing of spun-cast films of the copolymer, followed by cross-linking at 200°C, led to insoluble polymer films with a smooth surface. Green emitting fluorescent OLEDs were fabricated using the new cross-linkable polymer and compared with conventionally prepared devices. Using the thermally cross-linked copolymer as a hole-transporting layer, solution processed multilayer light emitting diodes were prepared that exhibited high performance with 10.4% external quantum efficiency at a brightness of 350 cd/m2.

Original languageEnglish (US)
Pages (from-to)4827-4832
Number of pages6
JournalChemistry of Materials
Volume19
Issue number19
DOIs
StatePublished - Sep 18 2007

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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