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

Title
Phosphorescent dye-based supramolecules for high-efficiency organic light-emitting diodes
Authors
Kim, Kwon-HyeonLee, SunghunMoon, Chang-KiKim, Sei-YongPark, Young-SeoLee, Jeong-HwanLee, Jin WooHuh, JuneYou, YoungminKim, Jang-Joo
Ewha Authors
유영민
SCOPUS Author ID
유영민scopus
Issue Date
2014
Journal Title
NATURE COMMUNICATIONS
ISSN
2041-1723JCR Link
Citation
NATURE COMMUNICATIONS vol. 5
Publisher
NATURE PUBLISHING GROUP
Indexed
SCI; SCIE; SCOPUS WOS
Document Type
Article
Abstract
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.
DOI
10.1038/ncomms5769
Appears in Collections:
엘텍공과대학 > 화학신소재공학전공 > Journal papers
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