Patent ID: 8178870
Filing Date: 2012-05-15
Classification: H01L,H05B

Abstract:
1. An organic electroluminescence element, comprising: an anode; a cathode that is a transparent electrode; an organic luminescent layer located between the anode and the cathode; an electron injection layer located between the cathode and the organic luminescent layer, the electron injection layer including at least one of an alkali metal and an alkali earth metal to inject electrons into the organic luminescent layer; and a cathode buffer layer located between the electron injection layer and the cathode, the cathode buffer layer including a hole transporting organic material, wherein the cathode buffer layer further comprises a material that makes the hole-transporting organic material electron-deficient, and wherein the material that makes the hole-transporting organic material electron-deficient is an organic material having an absolute value of an energy level of a lowest unoccupied molecular orbital of at least 4 eV with respect to a vacuum level.