Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3279155
Keywords
aluminium; brightness; cells (electric); charge injection; electrochemical electrodes; indium compounds; light emitting devices; organic semiconductors; polymer blends; polymer solutions; semiconductor-insulator boundaries; semiconductor-metal boundaries
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Funding
- Marie Curie RTN THREADMILL [MRTN-CT-2006-036040]
- Spanish Ministry of Science and Education [CSD2007-0007]
- Programa Jose Castillejo
- EPSRC
- EC [ERAS-CT-2003-980409]
- Engineering and Physical Sciences Research Council [EP/E04414X/1, GR/S97750/01] Funding Source: researchfish
- EPSRC [EP/E04414X/1] Funding Source: UKRI
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We report the use of blends composed of poly(9,9(')-dioctylfluorene-alt-benzothiadiazole), F8BT, and a polymeric ionic liquid (PIL), poly(vinyl-ethylimidazolium bistrifluoromethanesulfonimide), as the active layer in light-emitting electrochemical cells (LECs) with the simple indium-tin-oxide/active-layer/Al configuration. The PIL provides both the ionic charge and the transport channel necessary for the devices to operate as LECs resulting in reduction of charge injection barriers at the electrode/active-layer interfaces. We find that the performance of devices using PIL:F8BT blends improved with respect to pure F8BT with maximum luminance increasing from 10-20 cd/m(2) for pure F8BT to 2000-4000 cd/m(2) for blends. Turn-on voltages were also reduced from above 7 V down to around 3.6-4 V. The maximum external quantum efficiency was increased from 10(-3)%-10(-4)% to values higher than 0.1%.
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