Solution-processable　light-emitting　electrochemical　cells　(LECs)　with　simple　device　architecture　have　become　an　attractive　candidate　for　application　in　next　generation　lighting　and　flat-panel　displays.　Herein,　single　layer　LECs　employing　two　cationic　Ir(III)　complexes　showing　highly　efficient　blue-green　and　yellow　electroluminescence　with　peak　current　efficiency　of　31.6　cd　A-1　and　40.6　cd　A-1,　respectively,　have　been　reported.　By　using　both　complexes　in　the　device,　color-tunable　LECs　with　a　single　spectral　peak　in　the　wavelength　range　from　499　to　570　nm　were　obtained　by　varying　their　rations.　In　addition,　the　fabrication　of　efficient　LECs　was　demonstrated　based　on　low　cost　doctor-blade　coating　technique,　which　was　compatible　with　the　roll　to　roll　fabrication　process　for　the　large　size　production.　In　this　work,　for　the　first　time,　4　inch　LEC　devices　by　doctor-blade　coating　were　fabricated,　which　exhibit　the　efficiencies　of　23.4　cd　A-1　and　25.4　cd　A-1　for　the　blue-green　and　yellow　emission,　respectively.　The　exciting　results　indicated　that　highly　efficient　LECs　with　controllable　color　could　be　realized　and　find　practical　application　in　large　size　lighting　and　displays.