In　order　to　improve　brightness　and　efficiency　of　red　organic　light　emitting　devices　(OLEDs),　highly　efficient　red　tandem　OLEDs　have　been　fabricated　by　using　AlQ3:Mg/WO3　as　interconnecting　layer.　The　optimal　device　whose　efficiency　and　luminance　reach　three　times　efficiency　and　four　time　of　that　of　a　conventional　single-unit　device　respectively,　is　obtained　by　controling　WO3　thickness.　The　device　is　fabricated　by　Eu(DBM)3　bath　and　DCJTI　units,　with　a　structure　of　ITO/TPD/DCJTI:CBP/BCP/Alq3/Alq3:　Mg/WO3/TPD/Eu(DBM)3　bath:TPD/Eu(DBM)　3　bath/LiF/Al　and　the　maximum　luminance　of　8609　cd/m2　and　the　maximum　efficiency　of　10.2　cd/A　are　achieved.