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Supramolecularly Caged Green-Emitting Ionic Ir(III)-Based Complex with Fluorinated CN Ligands and Its Application in Light-Emitting Electrochemical Cells

TitleSupramolecularly Caged Green-Emitting Ionic Ir(III)-Based Complex with Fluorinated CN Ligands and Its Application in Light-Emitting Electrochemical Cells
Publication TypeJournal Article
Year of Publication2018
AuthorsNamanga, JE, Gerlitzki, N, Smetana, V, Mudring, AV
Journal Interfaces
Volume10
Pagination11026-11036
Date Published04
Type of ArticleArticle
ISBN Number1944-8244
Accession NumberWOS:000429625400046
Keywordsancillary ligand, cationic iridium complexes, conjugated polymers, cyclometalating ligands, electroluminescence, electroluminescent devices, emitter, emitters, green, interaction, iridium, light emitting electrochemical cell, Materials Science, photophysical properties, pi stacking, supramolecular assembly, Technology - Other Topics, transition-metal-complexes, white-light
Abstract

-bipyridine, pbpy) in the design of a new green-emitting iridium ionic transition metal complex with a fluoro-substituted cyclometallated ligand, 2-(4-fluorophenyOpyridinato (4Fppy). [Ir(4Fppy)(2)(pbpy)][PF6] has been synthesized and characterized and its photophysical and electrochemical properties have been studied. The complex emits green light with maxima at 561 and 556 nm under UV excitation from powder and thin film, respectively, and displays a high photoluminescence quantum yield (PLQY) of 78.5%. [Ir(4Fppy)(2)(pbpy)][PF6] based LECs driven under pulsed current conditions showed under an average current density of 100 A m(-2) (at 50% duty cycle) a maximum luminance of 1443 cd m(-2), resulting in 14.4 cd A(-1) and 7.4 lm W-1 current and power efficiencies, respectively. A remarkable long device lifetime of 214 h was observed. Reducing the average current density to 18.5 A m(-2) (at 75% duty cycle) led to an exceptional device performance of 19.3 cd A(-1) and 14.4 lm W1- for current and power efficiencies, an initial maximum luminance of 352 cd m(-2) and a lifetime of 617 h.

DOI10.1021/acsami.7b18159
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