NH-mu　LED,　namely　a　micro　light-emitting　diode　structure　with　nano-holes　dug　all　the　way　through　the　active　region,　is　designed　to　make　silver　nanoparticles　in　extremely　close　contact　with　the　quantum　wells　for　improving　the　coupling　between　the　localized　surface　plasmon　and　the　quantum　wells　(LSP-QWs　coupling)　and　thus　enhancing　the　optical　properties　of　the　mu　LED.　The　experimental　results　show　that,　thanks　to　this　deep　nanohole　structure,　the　LSP-QWs　coupling　can　be　realized　effectively,　which　ultimately　increases　the　optical　performance　of　the　mu　LED.　The　internal　quantum　efficiency　of　the　NH-mu　LED　filled　with　silver　nanoparticles　is　increased　by　12%,　and　the　final　optical　output　power　is　also　enhanced.　We　have　further　carried　out　a　comparison　study　which　measures　the　transient　lifetime　of　two　different　types　of　mu　LEDs,　and　the　results　provide　convincing　evidence　for　the　existence　of　the　ultra　close　range　LSP-QWs　coupling　effect.