Electron transport layer, organic electroluminescent device comprising same and preparation thereof

Abstract

The invention discloses an electron transport layer. The electron transport layer is a blending material layer and comprises an organic electron transport material and an organic metal complex, wherein the organic electron transport material is one compound or any combination of more than two compounds with the structure shown as formula 1. In the formula 1, 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; R1 is phenyl, biphenyl, naphthyl, alkyl with 1-5 carbon atoms or hydrogen; and n is an integer from 2 to 3. The invention further discloses an organic electroluminescent device comprising the electron transport layer and the preparation method of the organic electroluminescent device. The electron transport layer provided by the invention is manufactured by doping the organic electron transport material containing benzimidazole and the organic metal complex, so that electron mobility is relatively high and film formability is good; and the organic electron transport material and the organic metal complex form the electron transfer layer through vapor deposition, so that the excellent performance such as a low voltage, a long service lifetime and high efficiency can be realized.

Description

technical field [0001] The invention belongs to the field of organic electroluminescent devices, and relates to an electron transport layer, an organic electroluminescent device containing the electron transport layer and a preparation method thereof. Background technique [0002] Organic light-emitting diodes, also known as organic electroluminescent devices (OLEDs), are a new type of display technology developed since the middle of the 20th century. The phenomenon of organic electroluminescence was discovered in 1963, but the devices prepared at that time had high voltage and low luminous efficiency, which did not attract people's attention. Until 1987, Kodak introduced the OLED double-layer device, which greatly reduced the driving voltage of OLED and improved the luminous efficiency. Its low-voltage and high-brightness commercial application potential attracted people's attention. The OLED structure has developed from the earliest single-layer structure to the current m...

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.

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