Multi-layer organic light-emitting diodes processed from solution using phosphorescent dendrimers in a polymer host

Li Chun Ko, Tsung Yu Liu, Chun Yao Chen, Chung Ling Yeh, Shin Rong Tseng, Yu Chiang Chao, Hsin Fei Meng, Shih Chun Lo, Paul L. Burn, Sheng Fu Horng

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

A uniform dispersion of highly soluble phosphorescent dendrimer emitters is achievedby blending with a polymer host poly(9-vinylcarbazole) (PVK) containing N,N′-diphenyl-N, N′-(bis(3-methylphenyl)-[1,1-biphenyl]-4,4′- diamine (TPD) and 2-(4-biphen-4′-yl)-5-(4- tert-butylphenyl)-1,3,4- oxadiazole (PBD). No visible aggregation orself-quenching was observed for guest-to-host weight ratios of up to 33:67. The dendrimers contain a factris( 2-phenylpyridyl)iridium(III) [Ir(ppy)3] core, first generation biphenyl-based dendrons, and 2-ethylhexyloxy surface groups. The guest-host blend is used for all solution processed organic light-emitting diodes. A maximum external and current efficiency of 10.2% and 38 cd/A (at 5 V and a brightness of 50 cd/m2), and a maximum brightness of 27,000 cd/m 2 (at 14.5 V), were obtained when a CsF/Al cathode was used. Blade coating was used to fabricate a multi-layer structure that also contained an electron-transport layer. The device that had a LiF/Al cathode had a maximal efficiency of 40 cd/A corresponding to an external quantum efficiency of 10.8% (at 5 V and a brightness of 19 cd/m2). The maximum brightness of the second device was 17,840 cd/m2 at 14 V.

Original languageEnglish
Pages (from-to)1005-1009
Number of pages5
JournalOrganic Electronics
Volume11
Issue number6
DOIs
Publication statusPublished - 2010 Jun

Keywords

  • Blade coating
  • Dendrimer
  • Organic light-emitting diodes

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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