• Cho, Jian Yang
• Haldi, Andreas
• Kimyonok, Alpay
• Hayden, Lauren E.
• Wang, Xian Yong
• Domercq, Benoit
• Carlise, Joseph R.
• Kippelen, Bernard
• Barlow, Stephen
• Jones, Simon C.
• Marder, Seth R.

Abstract

<p>Solution-processable copolymers with pendant phosphorescent iridium complexes and 2,7-di(carbazol-9-yl)fluorene-type host moieties were synthesized using ruthenium-catalyzed ring-opening metathesis polymerization. Low polydispersity indices and molecular weights around 20 000 Da were obtained for all copolymers. As a result of the living character of the polymerization of the monomer containing the host moiety, a high degree of control over the molecular weights of all copolymers can be obtained. The photo- and electroluminescence properties of the copolymers were investigated. All copolymers retained the photo- and electrophysical properties of the corresponding nonpolymeric iridium complexes. Furthermore, as a proof of principle for the potential use of these materials, organic light-emitting devices were fabricated using the orange-emitting copolymer. A maximum external quantum efficiency of 1.9% at 100 cd/m ² and a turn-on voltage of 3.7 V were obtained with photoluminescence quantum yield of 0.10 demonstrating the potential of these copolymers as emissive materials for display and lighting applications.</p>

Topics

• photoluminescence
• molecular weight
• copolymer
• polydispersity
• Ruthenium
• Iridium