Construction　of　intramolecular　pi-pi　packing　between　cyclometalated　and　ancillary　ligand　have　been　proved　to　be　a　feasible　way　to　design　cationic　Ir(III)　phosphors　for　stable　light-emitting　electrochemical　cells　(LECs).　Employing　blue-green　(C1)　and　yellow-emitting　(C2)　Ir(III)　complexes　as　emitters,　in　which　such　pi-pi　interactions　between　ligands　occur,　the　stable　and　efficient　LECs　with　peak　current　efficiency　of　21.9　cd/A　and　203　cd/A,　respectively,　were　realized.　To　achieve　the　white　electroluminescence,　herein,　a　new　red-emitting　cationic　Ir　(III)　complex　(C3)　using　2-(5-phenyl-2-phenyl-2H-1,2,4-triazol-3-yl)pyridine　as　ancillary　ligand　was　designed　and　synthesized.　A　warm　white　light　emitting,　by　doping　C3　into　the　blue-green　emitting　Cl,　exhibits　the　current　efficiency　of　10.1　cd/A.　In　addition,　the　obtained　LECs　are　more　stable　than　those　of　previous　reports　due　to　presence　of　intrinsic　super-cage　structures　in　the　systems.　The　results　indicate　that　the　efficient　white　LECs　hold　promising　applications　in　the　practical　solid　state　lighting.　(C)　2016　Elsevier　B.V.　All　rights　reserved.