Light emitting device with molecularly doped polymer layer. A new diamine as a hole transporting molecule

In the present contribution a new hole transporting molecule belonging to the triphenyldiamine family (N,N?-diphenyl-N,N?-bis (4-metylphenyl)-1,1?-biphenyl-4,4?-diamine) in a polycarbonate matrix is studied as the hole transport layer in a two layer device with Alq3 as emitting layer. The dependence of the electrical and emitting behaviour on the doping level is studied and compared with the vacuum deposited diamine layer also interfaced with Alq3.