Compound containing carbazole derivative and application thereof in organic electroluminescent device

Abstract

The invention discloses a carbazole derivative-containing compound and application thereof in an organic electroluminescent device, the general formula structure of the carbazole derivative-containing compound is formed by randomly connecting two connecting sites adjacent to * a, * b and * c with connecting sites * y and * z to form a ring, and Ar1 to Ar4 are independently selected from substituted or unsubstituted aryl or heteroaryl with the carbon atom number of 6-18; l1 to L4 are independently selected from non-existing, substituted or unsubstituted arylene or heteroarylene with the carbon atom number of 6-18, and R1 is selected from alkyl with the carbon atom number of 1-10 and substituted or unsubstituted aryl or heteroaryl with the carbon atom number of 6-18; r2 and R3 are independently selected from hydrogen, deuterium, alkyl with the carbon atom number of 1-10, substituted or unsubstituted aryl or heteroaryl with the carbon atom number of 6-12, or are connected into a benzene ring, and are not hydrogen or deuterium at the same time. The compound provided by the invention has high mobility, the energy level meets the use requirement of a hole transport material, and the service life of an OLED (Organic Light Emitting Diode) device can be prolonged.

Description

technical field [0001] The invention belongs to the field of organic electroluminescence materials, and in particular relates to compounds containing carbazole derivatives and their application in organic electroluminescence devices. Background technique [0002] At present, the hole transport materials of organic electroluminescent devices (OLEDs) mainly use aromatic amine compounds, such as 4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB) ), N,N'-diphenyl-N,N'-bis(3-methylphenyl)-(1,1'-biphenyl)-4,4'-diamine (TPD), etc., which Such materials have high hole mobility, but due to their low glass transition temperature, recrystallization often occurs after the film is left for a long time, which is considered to be one of the reasons for the decay of electroluminescence (EL) devices. Therefore, in order to obtain EL devices with high conversion efficiency and long lifetime, increasing the glass transition temperature of hole transport materials is an effective means. [...

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Problems solved by technology

[0002] At present, the hole transport materials of organic electroluminescent devices (OLEDs) mainly use aromatic amine compounds, such as 4,4'-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB ), N,N'-diphenyl-N,N'-bis(3-methylphenyl)-(1,1'-biphenyl)-4,4'-diamine (TPD), etc., which Such materials have high hole mobility, but due to their low glass transition temperature, the film often recrystallizes after being placed for a long time, which is considered to be one of the reasons for the degradation of electroluminescent (EL) devices.

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