METAL SUB-LAYER WITHIN A HOLE-TRANSPORTING REGION

摘要

An organic electroluminescent device including an anode, a hole-transporting region disposed over the anode wherein the hole-transporting region contains at least one hole-transporting material, 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, a light-emitting layer formed in contact with the hole-transporting region for producing light in response to hole-electron recombination, an electron-transporting layer disposed over the light-emitting layer, and a cathode disposed over the electron-transporting layer.