Optimization of Orange-Emitting Electrophosphorescent Copolymers for Organic Light-Emitting Diodes

Orange‐emitting phosphorescent copolymers containing iridium complexes and bis(carbazolyl)fluorene groups in their side chains are employed as the emissive layer in multilayer organic light‐emitting diodes (OLEDs). The efficiency of the OLED devices is optimized by varying characteristics of the cop...

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Veröffentlicht in:Advanced functional materials 2008-10, Vol.18 (19), p.3056-3062
Hauptverfasser: Haldi, Andreas, Kimyonok, Alpay, Domercq, Benoit, Hayden, Lauren E., Jones, Simon C., Marder, Seth R., Weck, Marcus, Kippelen, Bernard
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Sprache:eng
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Zusammenfassung:Orange‐emitting phosphorescent copolymers containing iridium complexes and bis(carbazolyl)fluorene groups in their side chains are employed as the emissive layer in multilayer organic light‐emitting diodes (OLEDs). The efficiency of the OLED devices is optimized by varying characteristics of the copolymers: the molecular weight, the iridium loading level, and the nature and length of the linker between the side chains and the polymer backbone. A maximum efficiency of 4.9 ± 0.4%, 8.8 ± 0.7 cd A−1 at 100 cd m−2 is achieved with an optimized copolymer. Orange‐emitting phosphorescent copolymers containing iridium complexes and bis(carbazolyl)fluorene groups in their side chains are employed as the emissive layer in multilayer organic light‐emitting diodes. By varying the molecular weight and the iridium loading level of the copolymers, and by changing the linker between the side chains and the polymer backbone, an optimized efficiency of 4.9 ± 0.4% at 100 cd m−2 is achieved.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.200800446