Phosphorescent, green-emitting Ir(III) complexes with carbazolyl-substituted 2-phenylpyridine ligands: Effect of binding mode of the carbazole group on photoluminescence and electrophosphorescence

Min Ju Cho, Jung Il Jin, Dong Hoon Choi, Young Min Kim, Young Wook Park, Byeong Kwon Ju

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The ligands, 9-((6-phenylpyridin-3-yl)methyl)-9H-carbazole and 9-(4-(pyridin-2-yl)benzyl)-9H-carbazole were synthesized by attaching a carbazolyl group to the pyridine and phenyl rings of 2-phenylpyridine, respectively. Ir(III) complexes were prepared by a simple procedure and the solubility of the novel complexes was significantly better than that of the conventional, green-emitting conventional fac-tris(2-phenylpyridinato-C2,N)iridium(III). The Ir(III) complexes were used to prepare electrophosphorescent polymer light-emitting devices. The device comprising 10% of fac-tris(2-(4′-((9H-carbazol-9-yl)methyl)phenyl)pyridinato-C2,N)iridium(III) exhibited an external quantum efficiency of 7.88%, luminous efficiency of 23.01 cd/A, and maximum brightness of 32,640 cd/m2. The color of the emissions of fac-tris(2-(4′-((9H-carbazol-9-yl)methyl)phenyl)pyridinato-C2,N)iridium(III) was similar to that of conventional fac-tris(2-phenylpyridinato-C2,N)iridium(III). This work shows that integration of a rigid hole-transporting carbazole and phosphorescent complex in one molecule provides a new route to highly efficient, solution-processable complexes for electrophosphorescent applications.

Original languageEnglish
Pages (from-to)218-224
Number of pages7
JournalDyes and Pigments
Volume83
Issue number2
DOIs
Publication statusPublished - 2009 Nov

Bibliographical note

Funding Information:
This research work was supported by LG display (2009–2010). Particularly, Prof. D. H. Choi is grateful for financial support from the Seoul R&BD Program (2008–2009), and the second stage of the Brain Korea 21 Project in 2009 (Korea Research Foundation).

Keywords

  • Carbazole
  • Iridium(III) complex
  • Phosphorescence
  • Photoluminescence
  • Solubility
  • Triplet energy transfer

ASJC Scopus subject areas

  • General Chemical Engineering
  • Process Chemistry and Technology

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