High-efficiency blue-green electrophosphorescent light-emitting devices using a bis-sulfone as host in the emitting layer

Sung Jin Kim, Julie Leroy, Carlos Zuniga, Yadong Zhang, Lingyun Zhu, John S. Sears, Stephen Barlow, Jean Luc Brédas, Seth R. Marder, Bernard Kippelen

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

A bis-sulfone small molecule, 4,4′-bis(phenylsulfonyl)biphenyl has been evaluated as a host for the phosphor iridium(III) bis(2-(4,6- difluorophenyl)pyridinato-N,C2′)picolinate in blue-green organic light-emitting devices. In addition, a poly(norbornene)-based polymer functionalized with a 3,6-bis(carbazol-9-yl)carbazole moiety as a side group is utilized as a solution-processible hole-transport layer; comparison is made to the widely-used hole-transport polymer poly(N-vinylcarbazole) (PVK). At 100 cd/m2, the highest efficiency device incorporating the new polymer achieved an external quantum efficiency (EQE) of 6.9% (12.9 cd/A) with a turn-on voltage of 4.3 V. In comparison, the highest efficiency device using PVK achieved an EQE of 6.4% (11.3 cd/A) with a turn-on voltage of 6.0 V.

Original languageEnglish (US)
Pages (from-to)1314-1318
Number of pages5
JournalOrganic Electronics
Volume12
Issue number8
DOIs
StatePublished - Aug 2011
Externally publishedYes

Keywords

  • Organic light emitting diodes
  • Phosphorescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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