Organic electrolumineescence component and display device containing said organic electroluminescence component

Abstract

In the invention, an organic electroluminescent element comprises a cathode, an anode, a light-emitting layer, a hole source and an electronic source. The light-emitting layer is disposed between the anode and cathode, and the hole source is disposed between the anode and the light-emitting layer. The electronic source disposed between the cathode and the light-emitting layer is made of at least one kind of organic material and at least one kind of salt. The salt has the concentration capable of changing with the space distribution in the electronic source, so that the concentration of the salt at the electronic near the cathode is higher than that at the electronic source near the light-emitting layer.

Description

technical field [0001] The present invention relates to an organic electroluminescent device (organic electroluminescent device, OELD) and a display device comprising the organic electroluminescent device, in particular to an organic electroluminescent device in which the concentration of salts in the electron source varies with the spatial distribution. An excitation light element and a display device including an organic electroluminescence element. Background technique [0002] Regarding the development of OELD, since the material of the cathode must be a metal with a low work function, the reactivity itself needs to be very strong, so the early industry used magnesium to add a small amount of silver (probably with a ratio of ten to one) as a very good solution. Alloys for cathode electrodes. However, highly reactive metals are extremely unsuitable for the OELD process, so the industry then uses passive metals, such as aluminum, as electron injection electrodes. However...

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Problems solved by technology

However, due to the high chemical activity of alkali gold or alkaline earth metals such as cesium (Cs), lithium (Li), and magnesium (Mg), and the doping concentration of the metal is very strict, a slight deviation will lead to a decrease in the luminous efficiency and operation of the device. large variability in lifespan

Therefore, it is not suitable for large-scale application in the thermal evaporation process commonly used in the manufacture of OELD

In addition, the metal ions in the doped layer will diffuse under the trend of current, causing a luminance quenching effect in the organic light-emitting layer, resulting in a decrease in the luminous efficiency and operating life of the device.

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