Perovskite　quantum　dots　light-emitting　diodes　(PeLEDs)　have　been　developed　for　next-generation　high　resolution　display　applications.　However,　the　hindered　charge　injection　and　massive　charge　trapping　due　to　the　insulating　and　defective　surface　of　quantum　dots　(QDs)　usually　lead　to　a　slow　rise　in　electroluminescence　(EL)　response,　which　makes　it　challenging　to　realize　ultra-high　refresh　rate　displays　with　nanosecond　response.　Herein,　an　ionic　liquid　1-Butyl-3-methylimidazolium　Trifluoromethanesulfonate　([BMIM]OTF)　was　used　to　enhance　the　crystallinity　and　reduce　the　surface　area　ratio　of　QDs,　which　effectively　decreases　defect　state　and　injection　barrier　at　the　interface.　Therefore,　the　rise　time　of　EL　response　with　steady-state　is　successfully　reduced　by　over　75%.　We　further　reduce　the　capacitance　effect　by　decreasing　the　light-emitting　unit　area.　Thus,　ultra-high　resolution　(9072　pixel　per　inch)　PeLEDs　with　light-emitting　pixel　size　of　1.3　mu　m　were　realized,　achieving　a　brightness　exceeding　170,000　cd/m2　and　an　external　quantum　efficiency　up　to　15.79%.　Moreover,　it　achieves　nanosecond　ultrafast　response　time　under　steady-state,　which　is　the　fastest　response　time　of　PeLEDs　reported　so　far.　Our　work　represents　the　most　advanced　performance　of　ultra-high-resolution　PeLEDs,　and　provides　in-depth　insights　into　the　mechanism　of　improving　their　response　speed,　showing　significant　potential　in　high　refresh　rate　active　display　application.