Patent ID: 7528545
Filing Date: 2009-05-05
Classification: H01L

Abstract:
1. An OLED device comprising: a) an anode and a cathode spaced from the anode; b) two EL units disposed between the anode and cathode, such EL units being in contact with each other and each having at least one light emitting layer; and c) each EL unit further includes a p-type doped organic hole transporting layer disposed between The light emitting layer of that EL unit and the anode, and an n-type doped organic electron transporting layer disposed between the light emitting layer of that EL unit and the cathode; wherein the n-type doped organic electron transporting layer of The EL unit that is closest to the anode is in direct contact with the p-type doped organic hole transporting layer of the other EL unit.