Journal Article 147336-22-9 ABC transporter ATP-Binding Cassette Transporters Cytokinins Green Fluorescent Proteins Plant Proteins Research Support, Non-U.S. Gov't cytokinin deep-blue polymer light-emitting diodes deep‐blue flexible polymer light‐emitting diodes efflux transporter elastic‐plastic fully π‐conjugated polymer excellent energy dissipation capacity flexible polymer light‐emitting diodes grain yield internal plasticization strategy intrinsically stretchable π-conjugated polymers large‐area printed display long-distance translocation rice (Oryza sativa L.) semiconductor fluid plasticizing side‐chain internal plasticization single‐chain emission behavior strain tolerance capacity stretchable electroluminescent films stretchable fully π‐conjugated polymers film triphenylamine spirofunctionalization ultradeep‐blue polymer light‐emitting diodes ultra‐deep‐blue emission