Tunable emission of polymer light emitting diodes bearing green-emitting Ir(III) complexes: The structural role of 9-((6-(4-fluorophenyl)pyridin-3-yl)methyl)-9H-carbazole ligands

Min Ju Cho, Jung Il Jin, Dong Hoon Choi, Jung Hee Yoon, Chang Seop Hong, Young Min Kim, Young Wook Park, Byeong Kwon Ju

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

9-((6-Phenylpyridin-3-yl)methyl)-9H-carbazole and 9-((6-(4-fluorophenyl)pyridin-3-yl)methyl)-9H-carbazole were synthesized as ligands by attaching a carbazolyl group to the pyridine in 2-phenylpyridine and 2-(4-fluorophenyl)pyridine, respectively. Four different Ir(III) complexes were prepared using a simple procedure, the solubility of which was significantly greater than that of conventional green-emitting Ir(ppy)3. Among the many devices fabricated, that which contained 10% of Ir(Cz-ppy)1(Cz-Fppy)2 in PVK/PBD (70:30 wt%), exhibited an external quantum efficiency of 6.80%, luminous efficiency of 20.23 cd/A, and maximum brightness of 17520 cd/m2. In particular, the electronic property of the new 9-((6-(4-fluorophenyl)pyridin-3-yl)methyl)-9H-carbazole ligand can manipulate the triplet energy level of the Ir(III) complex to finely tune the emission spectra.

Original languageEnglish
Pages (from-to)143-151
Number of pages9
JournalDyes and Pigments
Volume85
Issue number3
DOIs
Publication statusPublished - 2010 May

Keywords

  • Electrophosphorescence
  • Iridium(III) complex
  • Ligand
  • Photoluminescence
  • Solubility
  • Triplet energy transfer

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

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