A　color　tunable　quantum-dot　light　emitting　diode(QLED)　with　the　structure　of　ITO/PEDOT:　PSS/TFB/Mixed-QDs/ZnO/Ag　was　fabricated　by　using　red　and　green　mixed　quantum　dots　as　the　light-emitting　layer,　and　the　electroluminescence　spectrum　of　QLED　device　was　studied.　The　experimental　results　show　that　the　QLED　device　has　significant　color　tunability.　With　the　increase　of　applied　voltage,　the　QLED　device　presents　a　color　change　from　dark　red　to　orange　and　then　to　dazzling　yellow-green.　The　QLED　device　exhibits　a　turn-on　voltage　of　2.0　V　and　the　maximum　brightness　can　reach　6×104　cd/m2.　What＇s　more,　the　device　achieves　a　maximum　current　efficiency　of　21　cd/A　and　a　maximum　external　quantum　efficiency　of　7.5%　at　31　934　cd/m2.　As　an　application　demonstration,　we　further　combine　the　color　tunable　QLED　device　with　GaN-based　blue　LED　to　prepare　a　white　light　emission.　The　results　show　that　the　color　temperature　of　white　light　emission　can　be　tuned　from　3　568　K(warm　white)　to　10　269　K(cold　white)　and　color　rendering　index　is　not　less　than　70,　exhibiting　great　prospects　in　the　application　of　lighting.　©　2022,　Science　Press.　All　right　reserved.