InP　quantum　dots　have　received　intensive　attention　due　to　their　tunable　emission　wavelengths,　narrow　bandwidths,　and　high　color　purity.　Nevertheless,　InP　quantum　dots　exhibit　notable　instability　in　a　complex　environment　due　to　their　highly　oxidizable　properties.　In　this　study,　we　present　a　strategy　for　synthesizing　InP@Al2O3　nanocomposites　that　have　InP　quantum　dots　evenly　embedded　in　a　hybrid　substrate　containing　Al2O3　and　coupling-interconnection　layers　of　Si　and　Al.　In　addition,　we　used　high-power　UV　irradiation　to　repair　the　defects　generated　during　the　synthesis　process,　leading　to　photoluminescence　(PL)　intensity　increase　of　more　than　10　times.　InP@Al2O3　nanocomposites　have　demonstrated　up　to　9　h　of　laser　stability,　30　days　of　water　stability　and　acid　stability　and　20　days　of　alkali　stability.　It　has　far　exceeded　that　of　InP　quantum　dots　and　commercially　available　phosphors.　Distal-type　light-emitting　diodes　(LEDs)　with　stable　and　standard　white　emission　can　be　realized　by　combining　red　and　green　InP@Al2O3　nanocomposites　with　blue　LED　chips.　©　2024　The　Royal　Society　of　Chemistry.