Tuning the number and position of triphenylamine substituents on a benzo[b]furan core to achieve high-efficiency deep-blue and blue emitters

The deep-blue to blue emitters, 56dTPA-BF, 356tTPA-BF and 2356fTPA-BF were successfully achieved by using benzo[ b ]furan as central skeleton. The 2356fTPA-BF shows the maximum EQE of 5.32/3.42% with emission peak of 448 nm in doped/non-doped devices.