Metal　halide　perovskite　quantum　dots　have　the　potential　to　become　the　next　generation　of　luminescent　display　material　because　of　their　excellent　optical　properties　such　as　high　photoluminescence　quantum　yield，　high　color　purity　and　adjustable　band　gap.　At　present，　the　electroluminescence　efficiency　of　red-green　perovskite　quantum　dot　light-emitting　diode　（PQLED）　has　reached　the　level　of　organic　light-emitting　diodes　（OLED）.　However，　organic　long-chain　ligands　hinder　charge　transport，　resulting　in　a　lower　brightness　of　perovskite　quantum　dot　light-emitting　diodes　at　maximum　external　quantum　efficiency　（EQE）.　In　order　to　realize　that　the　perovskite　QDs　still　have　high　luminescence　brightness　at　the　maximum　EQE，　we　replaced　the　organic　long-chain　ligand　with　the　inorganic　ligand　CaBr2，　strengthened　the　carrier　transmission　in　PQLED，　and　enhanced　the　electroluminescent　carrier　injection.　Compared　with　organic　long-chain　ligand　and　organic　short-chain　ligand，　inorganic　ligand　can　slow　down　the　electrical　insulation　caused　by　the　existence　of　organic　chains，　improve　the　conductance　of　QDs，　and　further　enhance　the　luminescence　characteristics　of　QDs.　Based　on　this　strategy，　we　achieved　perovskite　quantum　dot　light-emitting　diodes　with　a　peak　EQE　of　10.57%　at　a　high　brightness　of　3　753　cd/m2.　At　an　operating　voltage　of　6.6　V，　the　maximum　brightness　of　the　PQLED　is　116　612　cd/m2　©　2023　Chines　Academy　of　Sciences.　All　rights　reserved.