Improved Turn-on Times of Iridium Electroluminescent Devices by Use of Ionic Liquids

Improved Turn-on Times of Iridium Electroluminescent Devices by Use of Ionic Liquids

We demonstrate an improvement in the turn-on time of electroluminescent devices based on the iridium complex [Ir(ppy)2(dtb-bpy)]+(PF6 -), where ppy is 2-phenylpyridine and dtb-bpy is 4,4‘-di-tert-butyl-2,2‘-dipyridine, by introduction of the ionic liquid 1-butyl-3-methylimidazolium hexafluorophospha...

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Veröffentlicht in:Chemistry of materials 2005-06, Vol.17 (12), p.3187-3190
Hauptverfasser: Parker, Sara T, Slinker, Jason D, Lowry, Michael S, Cox, Marshall P, Bernhard, Stefan, Malliaras, George G
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container_end_page 3190
container_issue 12
container_start_page 3187
container_title Chemistry of materials
container_volume 17
creator Parker, Sara T
Slinker, Jason D
Lowry, Michael S
Cox, Marshall P
Bernhard, Stefan
Malliaras, George G
description We demonstrate an improvement in the turn-on time of electroluminescent devices based on the iridium complex [Ir(ppy)2(dtb-bpy)]+(PF6 -), where ppy is 2-phenylpyridine and dtb-bpy is 4,4‘-di-tert-butyl-2,2‘-dipyridine, by introduction of the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate BMIM+(PF6 -). Addition of 0.46 mol of the ionic liquid per mole of Ir complex reduces the turn-on time from 5 h to 40 min. However, the device lifetime is also reduced by a factor of 3 over this range, suggesting a tradeoff between device speed and stability. These results are discussed within the framework of the electrodynamic model of device operation and are found to be consistent with an increase in the ionic conductivity of the [Ir(ppy)2(dtb-bpy)]+(PF6 -) films upon the addition of ionic liquid.
doi_str_mv 10.1021/cm050314r
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