Web Release Date: December 27,
Improved Turn-On Times of Light-Emitting Electrochemical Cells
Department of Chemistry, Princeton University, Frick Lab, Princeton, New Jersey 08544, and Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14850
Received May 17, 2007
Revised Manuscript Received October 4, 2007
Abstract:
Electroluminescent devices from ionic transition metal complexes (iTMCs) are attractive candidates for display and lighting applications. A major limitation of application of iTMC devices is their turn-on times, which range from minutes to hours at 3 V. We report novel ruthenium and iridium complexes with pendant triethylammonium groups bonded to the ligands with methylene units of various lengths. These materials lead to devices with turn-on times at 3 V as short as 2.5 min for the iridium complexes and as low as 5 s for the ruthenium complexes.
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