Abstract
In this study, a series of four formyl-substituted chloro-bridged iridium(iii) dimers were prepared. Their absorption, photophysical and electrochemical properties were studied in dichloromethane solution. It was found that as the formyl content increased on the cyclometalating ligands, emission unexpectedly became brighter. Organic light-emitting diodes (OLEDs) were fabricated using each of these iridium dimers as the emitter. The OLED fabricated using the brightest of the series, 2b, as the dopant afforded a decent external quantum efficiency (EQE) of 2.6%. This suggests that chloro-bridged iridium dimers are potential candidates as solid-state emitters.
Highlights
Neutral mononuclear cyclometalated iridium complexes have received intense attention as emitters for organic light emitting diodes (OLEDs) in lighting and visual displays.[1]
Unlike OLED devices based on fluorescent emitters whose internal quantum efficiencies (IQE) are capped by 25% according to spin statistics, 100% of the excitons can be harvested in phosphorescent electroluminescent devices.[3]
OLED devices were fabricated using these complexes as phosphorescent dopants with performances modestly reduced in comparison to those reported by Bryce, Monkman and co-workes.6b This study corroborates their earlier report that dichloro-bridged dinuclear iridium complexes, even those functionalized as is the case here, can be used as the emissive layer in viable OLED devices
Summary
Formylated chloro-bridged iridium(III) dimers as OLED materials: opening up new possibilities†. A series of four formyl-substituted chloro-bridged iridium(III) dimers were prepared. Their absorption, photophysical and electrochemical properties were studied in dichloromethane solution. Organic light-emitting diodes (OLEDs) were fabricated using each of these iridium dimers as the emitter. The OLED fabricated using the brightest of the series, 2b, as the dopant afforded a decent external quantum efficiency (EQE) of 2.6%. This suggests that chloro-bridged iridium dimers are potential candidates as solid-state emitters
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
