Organic electroluminescent device and preparation method thereof

Abstract

The invention relates to an organic electroluminescent device. The organic electroluminescent device comprises a substrate, a first electrode layer, a plurality of lighting unit layers and a second electrode layer; the first electrode layer, the plurality of lighting unit layers and the second electrode layer are sequentially formed on the substrate; each lighting unit layer comprises a first organic functional layer, a lighting material layer and a second organic functional layer which are arranged on the first electrode layer; the lighting material layer comprises a blue light lighting layer, a green light lighting layer and a red light lighting layer; the blue light lighting layer is in physical contact with the first organic functional layer or the second organic functional layer; the green light lighting layer is overlapped on the blue light lighting layer and covers part of the blue light lighting layer; a separating layer is arranged between the red light lighting layer and the green light lighting layer; the projection of the red light lighting layer covers part of the green light lighting layer. According to the organic electroluminescent device adopting the structure above, a group of precise mask plates is needed to reach three-color lighting during preparing, and therefore, the yield is increased, the opening rate is increased, and the PPI of a display device is improved.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescent devices, in particular to an organic electroluminescent device with an optical compensation layer, and also relates to a preparation method of the organic electroluminescent device. Background technique [0002] An organic electroluminescent device (OLED) generally includes a plurality of pixels, each pixel consisting of several sub-pixels. One of the currently widely used schemes in small and medium sizes consists of red, green, and blue pixels forming one pixel. In order to obtain higher pixel resolution, the red, green, and blue sub-pixel layers need to use high-precision metal mask evaporation masks in the preparation process. Due to the high precision of the high-precision mask plate, each sub-pixel needs to be adjusted in position, and each adjustment will sacrifice part of the accuracy, thus increasing the cost of the device and limiting the realization of higher resolut...

AI Technical Summary

Problems solved by technology

This solution requires the introduction of a precision mask to increase the number of evaporation alignments, and the complex process is not conducive to mass production

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