Patent ID: 8174184

Claim:
An organic light emitting diode (OLED) comprising: an anode; a cathode; and an organic multi-layer structure disposed between the anode and the cathode, wherein the organic multi-layer structure comprises a hole injection layer (HIL) that is adjacent to the anode, a hole transport layer (HTL) that is adjacent to the HIL, and an emission layer (EML) that is adjacent to the HTL, wherein the HIL, the HTL, and the EML are configured to provide the organic multi-layer structure with an inner potential distribution having a non-linear profile, comprising a section having a positive slope and a section having a negative slope, wherein the organic multi-layer structure further comprises an electron transport layer (ETL) that is adjacent to the EML, and an electron injection layer (EIL) that is adjacent to the ETL, and wherein the EIL comprises LiQ and has a thickness about the same as EML.