title: Formylated chloro-bridged iridium(III) dimers as OLED materials: opening up new possibilities.
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.
authors.affiliation: Organic Semiconductor Centre, EaStCHEM School of Chemistry, University of St Andrews, St Andrews, Fife KY16 9ST, UK. eli.zysman-colman@st-andrews.ac.uk.
authors.forename: Michael Y
authors.initials: MY
authors.lastname: Wong
authors.forename: Guohua
authors.initials: G
authors.lastname: Xie
authors.forename: Clarisse
authors.initials: C
authors.lastname: Tourbillon
authors.forename: Martina
authors.initials: M
authors.lastname: Sandroni
authors.forename: David B
authors.initials: DB
authors.lastname: Cordes
authors.forename: Alexandra M Z
authors.initials: AM
authors.lastname: Slawin
authors.forename: Ifor D W
authors.initials: ID
authors.lastname: Samuel
authors.forename: Eli
authors.initials: E
authors.lastname: Zysman-Colman