Electron injection type organic electroluminescent display component

Abstract

The invention relates to a electric injection organic electroluminescence display device, which comprises a glass basic plate, the ITO conductive layer, cavity transmission layer, lighting layer, electric transmission layer and the metallic cathode which are arranged on the glass basic plate from down to up; wherein, the ITO conductive layer and the metallic cathode layer are connected to the positive and passive electrodes of direct current voltage; the upper and lower surfaces of said metallic cathode and electric transmission layer individually comprise matched protrusions; the upper surface of lighting layer comprises the protrusion matching the lower surface of electric transmission layer whose height is 20-40 nanometers and the distance is 150-300 microns. The invention sets protrusions on the metallic cathode, electric transmission layer and the lighting layer of OLED device, to improve the effective contact area between the electric transmission layer and the metallic cathode and the lighting layer, to improve the electric injection efficiency, improve the compound lighting rate between the electron and the cavity, and improve the lighting efficiency, brightness and service life of OLED device.

Description

technical field [0001] The invention belongs to an organic electroluminescence display device (OLED) in the field of flat panel display, and in particular relates to an electron injection type organic electroluminescence display device. Background technique [0002] In 1987, since Tang, an American Kodak company, first reported a high-efficiency, high-brightness organic electroluminescent thin film device with a double-layer structure, it has attracted great attention because of its low driving voltage, high luminous brightness, rich colors and It has become a research hotspot in the field of flat panel display due to its advantages such as simple process and large-area flat panel display. Luminous efficiency and luminous lifetime are two key issues for the practical application of organic electroluminescent devices, but there is a theoretical limit to the electroluminescent efficiency. In order to be able to be used in situations where strong light is required, such as lig...

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Problems solved by technology

In order to balance the injection of carriers to obtain devices with high efficiency and good stability, people not only use composite electrodes such as LiF / Al and CsF / Al, which are more effective in electron injection, but also use hole buffer layers, such as S.A. VanSlyke, etc. used CuPc between indium tin oxide (ITO) and NPB, which significantly improved the stability of the device; A.Gyoutoku, etc. used carbon film to make the half-life of the device more than 3500 hours; recently, Y.Kurosaka et al. and Z.B.Deng inserted a thin layer of Al between ITO and hole transport layer respectively 2 o 3 and SiO 2 The efficiency of the device is improved. The layers of the traditional OLED device are regular planes, and the injection efficiency of carriers is limited, which affects the luminous efficiency and brightness of the device.

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