Landep Ayuningtias

1 Introduction Polarity inversion of a doped conjugated polymer (CP) refers to the phenomenon in which the dominant charge carrier polarity in a CP switches as a function of doping level. Since the early reports of this unusual inversion behavior [1-3], several subsequent studies have followed, gradually revealing its implications and potential [4-13]. Research on polarity inversion has attracted attention due to its two major significances.

Abstract Fully stretchable organic light-emitting diodes (OLEDs), composed entirely of intrinsically stretchable materials, are essential for on-skin displays1,2,3. However, their low device efficiency has been a persistent barrier to practical applications for more than a decade4. Here we addressed this challenge by incorporating an intrinsically stretchable exciplex-assisted phosphorescent (ExciPh) layer.