Electroluminescence property of highly soluble Ir(III) complex utilized by various hole blocking layers in polymer light emitting diodes

Young Wook Park, Young Min Kim, Jin Hwan Choi, Tae Hyun Park, Jin Wook Jeong, Min Ju Cho, Dong Hoon Choi, Byeong Kwon Ju

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The tris(2-phenylpyridine)iridium(III) [Ir(ppy) 3] is a well known highly efficient green light-emitting phosphorescent guest dye dopant, but its relatively low solubility has been obstructing it to be used in polymer light-emitting diodes (PLEDs). According to our latest reports the solubility of Ir(ppy) 3 complexes with the carbazole ligands, i.e., Ir(Czppy) 3, was improved significantly in organic solvents, and was sufficient to be used in soluble process. This highly soluble Ir(Czppy) 3 complex showed remarkably higher photoluminescence characteristics than conventional Ir(ppy) 3, but it showed similar or comparably better electroluminescence (EL) characteristics, when the PLED was composed by widely used conventional hole blocking layer (HBL) and electron transport layer; 2,9-Dimethyl-4,7-diphenyl-1,10-phenanthroline and tris(8-hydroxyquinoline) aluminum, respectively. In this report, we applied various HBLs to improve the EL characteristics of soluble Ir(III) complex based phosphorescent PLEDs. The PLEDs utilized by the wide band-gap 3-(4-biphenylyl)-4-phenyl5-tert-butylphenyl- 1,2,4-triazole demonstrated highly improved the current and the external quantum efficiency of 17.61 cd/A and 6.42%, respectively.

Original languageEnglish
Pages (from-to)3250-3253
Number of pages4
JournalJournal of Nanoscience and Nanotechnology
Volume10
Issue number5
DOIs
Publication statusPublished - 2010 May 1

Keywords

  • Highly soluble ir(III) complex
  • Hole blocking layer
  • Ir(Czppy)
  • Ir(ppy)
  • Phosphorescent

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering
  • Biomedical Engineering

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