Green electroluminescence from an ionic iridium complex

Slinker, Jason D.; Koh, Cheong Y.; Malliaras, George G.; Lowry, Michael S.; Bernhard, Stefan
April 2005
Applied Physics Letters;4/25/2005, Vol. 86 Issue 17, p173506
Academic Journal
We report green emission from a single-layer device based on the ionic transition metal complex [Ir(F-mppy)2(dtb-bpy)]+(PF6-), where F-mppy is 2-(4′-fluorophenyl)-5-methylpyridine and dtb-bpy is 4,4′-di-tert-butyl-2,2′bipyridine. External quantum efficiencies of up to 1.1% are achieved with air-stable contacts, and up to 1.8% with a CsF/Al top contact. Addition of the ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate was found to improve the device response time and cause a bias-dependent shift in the emission spectrum. As a result, electroluminescence was observed at 531 nm (CIE coordinates: 0.3230 and 0.5886), the lowest wavelength reported to date for a device based on ionic transition metal complexes.


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