White-light-emitting organic electroluminescent devices using new chelate metal complexes

In this study, several. lanthanide complexes such as Eu(TTA)(3)(Phen), Tb(A CAC)(3)(Cl-Phen) were synthesized and the white light electroluminescence ( EL) characteristics of their thin films were investigated, where the device s having structures of anode/TPD[Tb(ACAC)(3)(Cl-Phen)/Eu(TTA)(3)(Phen)/Alq( 3) or Bebq(2)/cathode and the low work function metal alloy such as Li:Al w as used as the electron injecting electrode (cathode). Details on the white light-emitting characteristics of these device structures were explained b y the energy band diagrams of various materials used in these structures, w here the energy levels of new materials such as ionization potential (IP) a nd electron affinity (EA) were measured by cyclic voltametric method. (C) 2 000 Published by Elsevier Science S.A.