Electron transfer layer, organic electroluminescent device with electron transfer layer and manufacturing method thereof

Abstract

The invention discloses an electron transfer layer. The electron transfer layer is a blend material layer and comprises an organic electron transfer material and an organic metal complex, wherein the organic electron transfer material is one or any combination of more than two of compounds shown as formula I, in which AR is selected from sub-condensed cyclic aromatic hydrocarbons with 6-30 carbon atoms or sub-condensed heterocyclic aromatic hydrocarbons with 6-30 carbon atoms and N is an integer selected from 1 to 3. The invention further discloses an organic electroluminescent device with the electron transfer layer and a manufacturing method thereof. By a method of doping the phenylpyridinyl electron transfer material and the organic metal complex, the electron transfer layer has a relatively high electron mobility and good film formability and thermal stability; and the phenylpyridinyl electron transfer material and the organic metal complex form the electron transfer layer through vapor deposition, so that excellent performance of low voltage, long service life and high efficiency can be achieved.

Description

technical field [0001] The invention belongs to the field of organic electroluminescent devices, and in particular relates to an electron transport layer, an organic electroluminescent device containing the layer and a manufacturing method thereof. Background technique [0002] Organic light-emitting diodes, also known as organic electroluminescent devices (OLEDs), can be multilayer structures, generally including a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode and an anode. Among them, a single organic material is often used for the electron transport layer, but OLED devices prepared with a single organic material as the electron transport layer often have high driving voltage and low efficiency, which leads to large power consumption and short life of the OLED screen. . [0003] The electron transport layer adopts two kinds of mixed materials, and it is also reported that the p...

AI Technical Summary

Problems solved by technology

However, due to the high evaporation temperature of alkali metals, alkaline earth metals, or their halides and oxides, it brings a series of disadvantages, such as increasing equipment costs and slowing down production beats, etc.

In addition, the Chinese patent document CN1905236A discloses an organic electroluminescent device and its manufacturing method. The organic electroluminescent device adopts a material with hole blocking ability and a material with electron transport property to blend, As an electron transport layer, this technical invention has certain advantages compared with conventional single organic electron transport materials, but it still fails to reach the optimal level

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