Journal Article Review Antioxidants Ascorbate acid biosynthesis C = C cross‐linkable units Fruit quality Hydrogen-rich water Vegetable growth conjugated polymers coplanar conformation cross‐linking crystallinity deep blue deep-blue polymer light-emitting diodes deep‐blue flexible polymer light‐emitting diodes elastic‐plastic fully π‐conjugated polymer excellent deformation stability excellent energy dissipation capacity excited matter flexible electroluminescent devices flexible electronics flexible polymer light‐emitting diodes internal plasticization strategy intrinsically stretchable π-conjugated polymers large‐area printed display optoelectronic applications optoelectronic devices organic conjugated molecules outstanding strain tolerance capacity polyfluorene