Preparation method of OLED (Organic Light-Emitting Diode) pixel unit and OLED display panel

Abstract

The invention relates to the technical field of semiconductor manufacturing, and particularly relates to a preparation method of an OLED (Organic Light-Emitting Diode) device and an OLED display panel. The preparation method of the OLED device comprises the steps of providing a substrate; preparing an anode layer on the substrate; preparing an organic light-emitting layer on the metal anode layer; preparing a cathode layer on the organic light-emitting layer; and preparing a light extraction layer used for extracting different colors of light-emitting materials on the cathode layer, wherein a refractive index of the cathode layer is lower than a refractive index of the light extraction layer. The refractive index of the cathode layer is lower than the refractive index of the light extraction layer, so that extraction can be performed on 80% of light lost inside the OLED device, total internal reflection of partial light in the transmission process is avoided, and the luminous efficiency of the OLED device is greatly improved.

Description

technical field [0001] The invention relates to the technical field of semiconductor manufacturing, in particular to a method for preparing an OLED pixel unit and an OLED display panel. Background technique [0002] Existing OLED (Organic Light-Emitting Diode) devices, such as figure 1 As shown, a schematic structural diagram of an existing OLED device, an anode 5', a hole injection and transport layer 4', an organic light-emitting layer 3', an electron transport and injection layer 2', and a cathode 1 are sequentially arranged on a glass substrate. ', forming a parallel reflective structure. During the use of the OLED device, a voltage is applied between the anode 5' and the cathode 1', and the current flows from the cathode 1' to the anode 5' and passes through the organic light-emitting layer 3' (the current refers to the electron flow), the cathode 1' outputs electrons to the organic light-emitting layer 3', and the anode 5' absorbs electrons from the organic light-emit...

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Problems solved by technology

Depending on the formula, adjusting the type of organic molecules in the organic light-emitting layer 3' can produce three primary colors of red, green, and blue to form the basic color, and the brightness or intensity of the light is proportional to the current (the greater the current, the greater the brightness or intensity of the light. The higher the higher), but the existing OLED device, because the OLED device emits light as a special parallel reflection structure, most of the emitted light forms a total reflection at the interface (the connection between the internal layers of the OLED device is called the interface) , only about 20% of the light energy transmitted from the OLED device into the air is used, and its light extraction efficiency is low, while the unextracted light is lost in the form of heat energy, which affects the service life of the OLED device

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