LIGHT EMITTING DEVICES WITH MOLECULARLY DOPED POLYMER LAYERS. A NEW DIAMINE AS A HOLE TRANSPORTING MOLECULE

摘要

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 Alq_3 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 Alq_3.