A white light organic electroluminescent device with two layers and two precursors without spacers

Abstract

The invention discloses a white light organic electroluminescent device with a double-layer double-parent structure without a spacer layer, belonging to the technical field of organic electroluminescent devices. The device consists of a substrate, an anode, a hole transport layer, a luminescent layer, an electronic transport layer and a cathode. Between the hole transport layer and the electron transport layer, there are two dual-parent organic light-emitting layers, and the organic light-emitting dyes are doped in the dual-parent materials in the form of dopants. The dual-parent structure iscomposed of hole transport layer material and electron transport layer material. The doping ratio of hole transport layer material in the luminescent layer near the anode is larger than that in the luminescent layer near the cathode. As that luminescent lay adopts a double-layer double-parent structure without space layer, the interface potential barrier is reduced, the balance transmission of carrier and the uniform distribution of excitons in the luminescent lay are facilitated, and the high-efficiency white light emission with stable spectrum is easily realized.

Description

technical field [0001] The invention belongs to the technical field of organic electroluminescent devices, and relates to a white light organic electroluminescent device without a spacer layer and a double-layer double-matrix structure. Background technique [0002] Organic electroluminescent devices (OLEDs) have become a new generation of display products after liquid crystal displays (LCDs), and have huge potential advantages and broad application prospects in solid-state lighting. The advantages of OLED are mainly reflected in thin thickness, light weight, high efficiency, high brightness, bendability, wide viewing angle, low voltage, simple manufacturing process, high temperature controllability, wide source of materials, and no need for backlight. After nearly 30 years of hard work by researchers at home and abroad, OLED has gradually entered the stage of industrialization from the basic research stage, and its development prospects in the lighting field are optimistic ...

AI Technical Summary

Problems solved by technology

In addition, the spacer layer between the light-emitting layers will also generate additional interface barriers; ② lack of bipolar host materials; since most of the commonly used host materials have unipolar carrier transport characteristics, the electron transport material and hole Transport materials are doped as double hosts to balance carrier injection and transport

③There is a lack of high-performance blue-light phosphorescent materials; so far, research on light-emitting devices using a dual-matrix structure has mainly focused on monochrome OLED devices, and there are few reports on white light-emitting devices.

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