Transparent, Stretchable, and Self‐Healable Gas Barrier Films with 2D Nanoplatelets for Flexible Electronic Device Packaging Applications

Abstract Self‐healable elastomeric materials ( PUA x PU 10– ‐PDMS , = 4, 6, or 8) have been synthesized and utilized as substrates encapsulation films on the top of barrier (deposited polyethylene terephthalate (PET) substrates) to improve their gas properties for packaging applications. Hexa‐layer (HL) assembly consisting two inorganic 2D nanoplatelets, including Mg‐Al layered double hydroxide (LDH) hexagonal boron nitride (hBN), oppositely charged polyelectrolytes, that is, polyethyleneimine (PEI) poly(sodium styrene‐4‐sulfonate) (PSS), developed by alternative depositions HL (i.e., PSS/LDH/PSS/PEI/hBN/PEI) sequentially. Then, a layer‐by‐layer technique is applied produce multiple assemblies hexa‐layer n reduce water vapor transmission rate (WVTR) values 8 2 PET substrates. The optimum WVTR 7.1 × 10 −3 8.0 g m −2 day −1 are achieved using PET/(HL) / (125/3/1 µm) /(HL) (125/3 films, respectively. self‐healable recover initial after self‐healing mechanically damaged films. Organic light‐emitting diodes (OLEDs) encapsulated with 9–10 times longer half‐lifetime than bare OLEDs. Accordingly, this report develops transparent, stretchable, next‐generation flexible electronic device