Thin-film　encapsulation　(TFE)　with　strong　barrier　properties　is　essential　for　dependable　flexible　display.　Hybrid　Al2O3　and　polymer　multi-layered　structures　are　considered　the　most　promising　TFE　technology.　However,　hydrolysis　of　Al2O3　becomes　severe　with　increased　temperature　and　humidity,　threatening　the　reliability　of　TFE.　In　this　work,　Alucone　is　introduced　in　the　Al2O3/NEA　multi-layers,　where　the　Alucone　can　serve　as　a　hydrolysis　inhibition　layer,　to　improve　its　reliability.　In　addition,　Al2O3　is　permeated　into　the　NEA　polymer　to　further　improve　the　barrier　performance　of　Al2O3/NEA　multi-layers.　The　results　show　that　the　insertion　of　Alucone　can　inhibit　effectively　the　hydrolysis　of　Al2O3　in　the　accelerated　test　environment.　The　complete　interfacial　infiltration　of　Al2O3　into　NEA　polymer　can　further　improve　the　barrier　performance.　The　water　vapor　transmission　rates　of　(Al2O3/Alucone)3/NEA　(named　AAN　composite　films)　can　reach　0.27　×　10−6　g/m2/day.　The　barrier　performance　of　AAN　composite　films　remains　robust　even　after　bending　tests　and　stability　examinations.　The　OLED　encapsulated　by　the　AAN　composite　films,　only　less　than　10　%　brightness　decline　occurs　after　7　days,　illustrating　that　AAN　composite　films　can　extend　the　lifetime　of　OLED.　The　results　demonstrate　that　the　AAN　composite　films　is　anticipated　to　hasten　the　commercialization　of　flexible　displays.　©　2024　Elsevier　Ltd