Quantum　dot　light-emitting　diodes　(QLEDs)　are　emerging　as　promising　candidates　for　next-generation　displays,　with　the　current　efficiency　and　stability　of　both　red　and　green　QLEDs　meeting　display　requirements.　However,　the　efficiency　and　stability　of　blue　QLEDs,　particularly　pure　blue　iterations,　significantly　lag　behind　those　of　their　red　and　green　counterparts,　thus　hindering　the　widespread　adoption　of　full-color　QLEDs.　Here,　we　introduce　a　strategy　to　improve　the　efficiency　and　stability　of　pure　blue　zinc　selenide　(ZnSe)　QLEDs　by　adding　a　new　ionic　liquid　(IL)　salt,　1-butyl-3-methylimidazolium　phosphorus　hexafluoride　(BMIMPF6),　into　the　hole　transport　layer　(HTL).　This　IL　salt　acts　as　an　effective　p-dopant,　enhancing　charge　mobility　while　also　increasing　the　surface　potentials　of　the　HTL　for　better　alignment　of　energy　bands　at　the　interface.　This　results　in　a　significant　improvement　in　device　performance,　with　the　external　quantum　efficiency　(EQE)　increasing　from　4.90%　to　7.02%,　setting　a　high　performance　for　cadmium-free　pure-blue　ZnSe　QLEDs.　Additionally,　the　device＇s　operational　lifetime,　measured　as　the　time　taken　for　luminance　to　drop　to　50%　(T-50)　at　100　cd　m(-2),　sees　a　remarkable　six-fold　increase,　reaching　177　hours.　Our　work　represents　a　significant　advancement　in　developing　cadmium-free　pure-blue　ZnSe　QLEDs　and　offers　valuable　insights　for　designing　efficient　and　stable　quantum　dot-based　displays.