Improving　the　quantum　yield　of　non-toxic　InP/ZnS　QDs　is　essential　for　its　commercial　application　in　illumination　and　displays.　In　this　work,　single　size　Au　nanoparticles　(Au　NPs)　coated　with　different　shell　thicknesses　of　Al2O3　as　well　as　TiO2　fabricated　by　atomic　layer　deposition　were　prepared　and　applied　to　enhance　the　photoluminescence　of　InP/ZnS　QDs　with　different　emission　wavelengths.　These　oxide　films　were　used　to　control　the　distance　between　Au　NPs　and　QDs　to　inhibit　the　fluorescence　resonance　energy　transfer　(FRET)　and　to　demonstrate　the　competitive　mechanism　of　fluorescence　enhancement　and　fluorescence　quenching　induced　by　local　surface　plasmon　resonance.　It　was　found　that　the　size　dependence　of　Au　NPs　and　the　FRET　effect　can　be　effectively　alleviated　by　covering　different　oxide　shells.　When　the　Au　NPs　coated　with　10 nm　Al2O3　and　6 nm　TiO2,　the　photoluminescence　of　InP/ZnS　green　QDs　and　red　QDs　can　be　increased　by　3.46　times　and　5.65　times,　respectively.　These　results　indicate　that　the　fluorescence　intensity　of　quantum　dots　with　different　emission　wavelengths　can　be　easily　improved　by　coating　Au　NPs　with　different　types　of　shells　or　with　different　thicknesses,　exhibiting　the　promising　application　prospect　in　backlight　and　biometric　recognition　of　QDs.　©　2022,　The　Author(s),　under　exclusive　licence　to　Springer　Science+Business　Media,　LLC,　part　of　Springer　Nature.