Abstract: An organic electroluminescent (EL) device having improved efficiency and service life is provided. The organic electroluminescent device has a stack structure including an emitting layer and an electron-transport layer positioned between an anode and a cathode. The electron-transport layer includes a first layer adjacent to the emitting layer which may be a mixture of at least two materials, and a second layer adjacent to the cathode which may be a mixture of at least two materials. The mixture of at least two materials may be a mixture of an organic compound and one or more other organic compounds, or may be a mixture of a metal or inorganic compound and one or more other metal or inorganic compounds, or may be a mixture of one or more organic compounds and one or more metal or inorganic compounds.

Abstract: An organic electroluminescent (EL) device is provided which uses an electron-transport layer including hole blocking capability. The device includes a stack structure, with an emitting layer and an electron-transport layer provided between an anode and a cathode. The electron-transport layer is a mixture of at least two materials. This mixture may include an organic compound and one or more other organic compounds, or may include a metal or inorganic compound and one or more other metal or inorganic compounds, or may include one or more organic compounds and one or more metal or inorganic compounds. By incorporating a hole blocking capability into the electron-transport layer, structure and fabrication of the device is simplified and efficiency is increased.

Abstract: Disclosed herein is an organic electroluminescent (EL) device comprising an intermediate layer made of at least one selected from a hole blocking material and an electron blocking material.

Abstract: Disclosed herein are an organic electroluminescent (EL) device comprising a hole transport layer (HTL) and a method for fabricating the same. The organic electroluminescent (EL) device comprises a stack in which a light-emitting layer and a hole transport layer are interposed between an anode and a cathode, wherein the hole transport layer is made of a mixture of at least two materials, and wherein the mixture is selected from a mixture of an organic compound and one or more other organic compounds, a mixture of a metal or inorganic compound and one or more other metal or inorganic compounds, and a mixture of one or more organic compounds and one or more metal or inorganic compounds.