Electroluminescent device of organic thin film

Abstract

The Electroluminescent device is composed of following layers and parts prepared on clear electrode: cavity transport layer, organic luminous layer, inorganic electron transport layer, electronic potentiometric compensator layer and back electrode. Inorganic electron transport layer is prepared from n type ZnS or n type ZnO with thickness 1nm-10nm. Inorganic electron transport layer is also prepared from other n type wide forbidden band inorganic materials: n type CoO, n type GaN, n type BaO, n type MgO or n type AIN. The invention raises luminescence brightness, efficiency and service life since mutual diffusion between luminous layer and electrode in electroluminescent device and inadequate balance between cavities and electrons are improved in the disclosed structure.

Description

technical field [0001] The invention relates to an organic thin film electroluminescent device, which is mainly used for producing an organic thin film electroluminescent device with high brightness, efficiency and long life. Background technique [0002] Since Deng Qingyun C.W.Tang of Kodak Company of the United States reported organic electroluminescence in 1987, there has been an upsurge in the research of organic thin film light-emitting diodes all over the world. Organic thin-film light-emitting diodes have unique advantages such as active light emission, fast response, full solidification, easy colorization, and low driving voltage. They are very potential flat panel displays that will replace the current liquid crystal displays that dominate the market. It is precisely because of its background in the field of flat panel display that many companies, universities and research institutes have invested a lot of manpower and material resources in organic electroluminescen...

AI Technical Summary

Problems solved by technology

However, in order to obtain high-brightness, high-efficiency and long-life organic electroluminescent devices, some problems in organic electroluminescence have not been well resolved, such as the limitations of current hole and electron transport layer materials and preparation processes. , with the structure of ordinary organic electroluminescent devices: ITO / hole transport layer / organic light-emitting layer / back electrode, there are some problems as follows: mutual diffusion between the light-emitting layer and the electrode, not enough hole and electron mobility , and the injected holes and electrons are not balanced enough, etc.

These problems limit the further improvement of organic electroluminescent devices and become an important bottleneck in the development of organic electroluminescent devices, making it impossible to prepare organic light-emitting devices with excellent performance.

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