Poor　performance　of　red-emitting　all-inorganic　CsPbX3　(X　=　Cl,　Br,　I)　perovskite　nanocrystals,　specifically　their　low　excitation　efficiency　in　the　blue　and　Ultraviolet　A　spectral　ranges,　limits　their　application　as　color　conversion　layers　for　micro-LED　displays.　In　this　work,　new　nanocomposites　featuring　CdSe/ZnS-CsPb(BrI)3　heterostructure　nanocrystals　(hs-NCs)　are　develpoed,　where　the　built-in　F　&　ouml;rster　resonance　energy　transfer　mechanism　enhances　red　emission　by　efficiently　transferring　excitation　energy　from　CdSe/ZnS　to　CsPb(BrI)3.　Consequently,　the　photoluminescence　excitation　spectrum　of　hs-NCs　shifts　to　peak　in　the　Ultraviolet　A　range,　achieving　a　nearly　highest　photoluminescence　quantum　yield　of　98.7%　under　400　nm　excitation.　The　hs-NCs　demonstrate　high　compatibility　with　ultra-fine　electrohydrodynamic　inkjet　printing,　enabling　fabrication　of　high-resolution,　bright,　and　stable　pure-red　CCL　arrays　with　a　minimum　pixel　size　of　8　mu　m.　When　combined　with　blue　and　green　perovskite　nanocrystals,　these　arrays　achieve　full-color　pixel　configurations　with　a　color　gamut　of　131.3%　NTSC　standard.　These　results　offer　a　substantial　breakthrough　on　the　quality　of　color　conversion　layers　while　opening　new　avenues　for　the　advancement　of　micro-LED　display　technologies.