With　pixel　miniaturization,　the　performance　of　high-resolution　quantum　dot　light-emitting　diodes　(QLEDs)　usually　degrades.　Considering　the　dimension　of　ultrasmall　pixels,　herein,　a　barrier　architecture　based　on　localized　surface　plasmon　resonance　(LSPR)　that　promotes　the　radiative　recombination　of　neighboring　quantum　dots　is　rationally　designed　to　improve　the　device　performance.　Au　nanoparticles　(NPs)　are　embedded　in　an　insulating　polymer　to　form　a　honeycomb-patterned　barrier　layer　via　the　nanoimprint　process.　Each　pixel　fabricated　in　the　void　area　(average　diameter　of　1.5　μm)　of　the　barrier　layer　is　surrounded　by　a　number　of　LSPR-NPs　to　enhance　the　luminescence.　The　resultant　green　QLEDs　with　a　resolution　of　9027　pixels　per　inch　show　a　maximum　external　quantum　efficiency　of　11.1%,　a　42.8%　enhancement　compared　to　the　control　device.　Additionally,　the　lifetime　of　high-resolution　QLEDs　is　obviously　improved　by　the　LSPR　effect.　©　2024　American　Chemical　Society