Phosphorescent dye-based supramolecules for high-efficiency organic light-emitting diodes

Kwon Hyeon Kim, Sunghun Lee, Chang Ki Moon, Sei Yong Kim, Young Seo Park, Jeong Hwan Lee, Jin Woo Lee, June Huh, Youngmin You, Jang Joo Kim

Research output: Contribution to journalArticlepeer-review

350 Citations (Scopus)


Organic light-emitting diodes (OLEDs) are among the most promising organic semiconductor devices. The recently reported external quantum efficiencies (EQEs) of 29-30% for green and blue phosphorescent OLEDs are considered to be near the limit for isotropically oriented iridium complexes. The preferred orientation of transition dipole moments has not been thoroughly considered for phosphorescent OLEDs because of the lack of an apparent driving force for a molecular arrangement in all but a few cases, even though horizontally oriented transition dipoles can result in efficiencies of over 30%. Here we use quantum chemical calculations to show that the preferred orientation of the transition dipole moments of heteroleptic iridium complexes (HICs) in OLEDs originates from the preferred direction of the HIC triplet transition dipole moments and the strong supramolecular arrangement within the co-host environment. We also demonstrate an unprecedentedly high EQE of 35.6% when using HICs with phosphorescent transition dipole moments oriented in the horizontal direction.

Original languageEnglish
Article number4769
JournalNature communications
Publication statusPublished - 2014

Bibliographical note

Funding Information:
This work (2014R1A2A1A01002030) was supported by the Mid-career Researcher Program through an National Research Foundation grant funded by theMinistry of Science, ICT and Future Planning.

Publisher Copyright:
© 2014 Macmillan Publishers Limited. All rights reserved.

ASJC Scopus subject areas

  • General Chemistry
  • General Biochemistry,Genetics and Molecular Biology
  • General Physics and Astronomy


Dive into the research topics of 'Phosphorescent dye-based supramolecules for high-efficiency organic light-emitting diodes'. Together they form a unique fingerprint.

Cite this