Norbornene-Based Copolymers with Iridium Complexes and Bis(carbazolyl)fluorene Groups in Their Side-Chains and Their Use in Light-Emitting Diodes

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• 作者：Alpay Kimyonok ; Benoit Domercq ; Andreas Haldi ; Jian-Yang Cho ; Joseph R. Carlise ; Xian-Yong Wang ; Lauren E. Hayden ; Simon C. Jones ; Stephen Barlow ; Seth R. Marder ; Bernard Kippelen ; Marcus Weck
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：November 13, 2007
• 年：2007
• 卷：19
• 期：23
• 页码：5602 - 5608
• 全文大小：200K
• 年卷期：v.19,no.23(November 13, 2007)
• ISSN：1520-5002

文摘

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 metathesispolymerization. Low polydispersity indices and molecular weights around 20 000 Da were obtained forall copolymers. As a result of the living character of the polymerization of the monomer containing thehost moiety, a high degree of control over the molecular weights of all copolymers can be obtained. Thephoto- and electroluminescence properties of the copolymers were investigated. All copolymers retainedthe 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 deviceswere fabricated using the orange-emitting copolymer. A maximum external quantum efficiency of 1.9%at 100 cd/m² and a turn-on voltage of 3.7 V were obtained with photoluminescence quantum yield of0.10 demonstrating the potential of these copolymers as emissive materials for display and lightingapplications.