Metal　halide　perovskite　materials　are　widely　used　as　luminescent　materials　to　prepare　perovskite　light-emitting　diodes(PeLEDs)　due　to　their　outstanding　optical　properties　such　as　high　photoluminescence　quantum　yield,　high　color　purity,　and　adjustable　band　gap.　Although　good　research　progress　has　been　made,　its　large-scale　preparation　for　commercialization　is　still　very　slow,　and　further　efforts　are　needed.　In　order　to　realize　the　large-area　preparation　of　perovskite　thin　film　light-emitting　diodes,　this　paper　uses　inkjet　printing　technology　to　study　the　influence　of　different　substrate　structures　on　the　spreading　and　crystallization　of　the　perovskite　precursor　liquid　and　the　comparison　of　device　performance.　Then　a　kind　of　inorganic　small　molecule　material　lithium　fluoride(LiF)　with　hole　blocking　ability　was　introduced　as　a　buffer　layer　and　deposited　on　TFB　to　obtain　a　pixelated　and　evenly　distributed　perovskite　film,　so　that　the　highest　brightness　with　uniform　light　emission　was　obtained.　And　we　get　a　printed　perovskite　light-emitting　diode　with　4　861cd/m2　and　a　maximum　current　efficiency　of　5.41　cd/A.　The　studies　showed　that　the　LiF　buffer　layer　has　a　certain　blocking　effect　on　the　injection　of　holes,　and　effectively　prevents　the　exciton　quenching　caused　by　the　contact　between　the　perovskite　luminescent　layer　and　the　TFB　after　plasma　treatment.　©　2021,　Science　Press.　All　right　reserved.