High-Efficiency Fluorescent Blue Organic Light-Emitting Device with Balanced Carrier Transport

We demonstrate a blue fluorescent organic light-emitting device having a current efficiency of 19.2 cd ∕ A and an external quantum efficiency of 8.32% at 100 cd ∕ m 2 . While driving at 20 mA ∕ cm 2 , the device showed a current efficiency of 16.5 cd ∕ A with a CIE coordinate at (0.155, 0.239) and an operation voltage of 5.14 V . The estimated half-decay lifetime is 15,611 h at an initial luminance of 1000 cd ∕ m 2 . The improved performance is the result of better carrier balance which is achieved by using bis(10-hydroxybenzo[ h ]quinolinato)beryllium ( Be bq 2 ) as the electron-transport layer.