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In the application of polymer light emitting diodes (PLEDs), to prevent etching of ITO by the acidic poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), the pH-neutral PEDOT:PSS was introduced as the hole injection layer (HIL). For the double layer PEDOT:PSS HIL, the pH-neutral PEDOT:PSS on top of ITO stops the indium migration into the polymer, while the regular acidic PEDOT:PSS...
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