Patent ID: 8057916

Claim:
An OLED device, comprising: a) an anode; b) a cathode; c) multiple light-emitting layers wherein at least one light emitting layer is an organic blue light-emitting layer disposed between the anode and the cathode; d) an electron-transporting layer in direct contact with the blue light-emitting layer and disposed between the blue light-emitting layer and the cathode, such electron-transporting layer including a first electron-transporting material; e) an electron-injecting layer disposed between the electron-transporting layer and the cathode, such electron-injecting layer including a metal dopant having a work function less than 4.0 eV and an electron-transporting material that is different from the first electron-transporting material, wherein the first electron-transporting material has a LUMO between that of the LUMO of the light-emitting layer and the electron-transporting material of the electron-injecting layer; f) an intermediate connector disposed between the light-emitting layers, the intermediate connector including an electron-accepting layer with an organic material, wherein the reduction potential of the organic material is greater than âˆ’0.1V vs. SCE; and wherein the device produces a broadband light from the multiple light-emitting layers.