Journal Article 3D penetrating nanonetworks RGB area emission direct (hetero)arylation polycondensation donor–acceptor conjugated polymers high mobility homologous blending strategy intense luminescence intrinsic stretchability intrinsically stretchable materials low voltage multilayer heterojunctions n‐type field‐effect transistors organic light-emitting transistor arrays organic transistors photonic synapses polymer light-emitting diodes polymer semiconductors self-assembly van der Waals interaction