Fig. 1: Molecular design of asymmetrically substituted FπCPs with an anisotropic shape aggregate toward suppressing coffee-ring effect in inkjet-printed processing.

a Molecular motion during evaporation of printed ink droplets; b The Gaussian coils stack in the molecular chain will aggravate the formation of coffee rings. This article uses the anisotropic shape rod-like aggregate of FπCPs chains to suppress the coffee-ring effect; c Chemical structures of asymmetrically substituted random copolymers FπCPs (PODPF, PFPO, and POPOF); d Fluorescence microscopic images of POPOF inkjet printing pattern (under UV lamp 365 nm) on flexible PET substrate; e The stress-strain curve of three films was obtained under room temperature with a stretching rate of 0.005 mm s⁻¹; f Comparison of the EQE and stretchability given by PFPO (this work) with the corresponding values for previously reported intrinsically stretchable light-emitting polymers based on fluorescence emitters^8,31,37,38.Source data are provided as a Source Data file.