Patent ID: 6818329
Filing Date: 2004-11-16
Classification: H01L,Y10S

Abstract:
An organic electroluminescent device comprising:a) an anode; b) a hole-transporting region disposed over the anode; wherein the hole-transporting region contains at least one hole-transporting material; c) a metal sub-layer disposed within the hole-transporting region; wherein the metal sub-layer contains at least one metal selected from group 4 through group 16 of the Periodic Table of Elements and the selected metal has a work-function higher than 4.0 eV; d) a light-emitting layer formed in contact with the hole-transporting region for producing light in response to hole-electron recombination; e) an electron-transporting layer disposed over the light-emitting layer; and f) a cathode disposed over the electron-transporting layer.