Inkjet-printed　quantum　dot　light-emitting　diodes　(QLEDs)　are　considered　to　be　ideal　candidates　for　use　in　full-color　displays.　However,　preparation　of　eco-friendly　blue　InP　QLEDs　using　inkjet　printing　techniques　remains　rather　challenging　due　to　the　inferior　optical　properties　of　QDs.　Here,　we　present　the　first　efficient　method　for　generating　inkjet-printed　QLEDs　with　high　color　purity　using　blue　InP/ZnS/ZnS　QDs　as　the　emitting　layer.　A　two-step　heat-up　and　thick　shell　strategy　was　employed　for　the　preparation　of　blue　InP/ZnS/ZnS　QDs　with　a　photoluminescence　(PL)　peak　at　465　nm,　full　width　at　half-maximum　of　38　nm,　and　PL　quantum　yield　(QY)　of　∼　96　%,　which　are　the　records　for　blue　InP　QDs.　We　found　that　the　use　of　a　zinc　iodide　precursor　and　anhydrous　oxygen　reaction　environment　is　critical　to　determining　InP　core　size,　and　the　size　distribution　of　InP　cores　can　be　improved　by　separating　formation　of　InP　magic　size　clusters　and　cores　via　a　heat-up　step　at　low　temperature.　We　used　two　kind　of　zinc　precursors　to　facilitate　shell　growth,　and　the　engineered　shell　thickness　suppresses　energy　transfer,　enabling　InP/ZnS/ZnS　QDs　film　with　high　PLQYs　and　contributing　to　efficient　inkjet　printing　of　QLEDs.　These　results　can　facilitate　the　development　of　blue　InP　QLEDs　for　large-area　electroluminescent　full-color　displays.　©　2022　Elsevier　B.V.