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Ionic liquid (IL) 1-butyl-3-methylimidazolium chloride ([BMIm]Cl) is doped into PEDOT:PSS hole-injecting layer to adjust the electroluminescent performance of OLEDs. The secondarily IL-doped PEDOT:PSS films are characterized in detail by SEM, XPS and UPS. The UPS results indicated the decrease of ionization potential of PEDOT:PSS due to the secondary IL-doping. The SEM observation showed the phase...
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