A kind of axene compound and its preparation method and application

Abstract

The present invention provides an axene compound, its preparation method and application, including the compound with the structure shown in formula I. The axene compound provided by the present invention has a non-planar structure (three-dimensional structure), and there is no stacking between molecules, which can reduce the annihilation generated by high-energy excitons, promote the anode to inject holes into the hole transport layer, avoid the generation of Joule heat, avoid The stacking and crystallization of the molecules in the hole transport layer can further improve the service life of the device; the axenene compound provided by the invention has good thermal stability and good film-forming property, which is also beneficial to improving the service life of the device.

Description

technical field [0001] The invention belongs to the field of organic electroluminescence, and relates to an axene compound, a preparation method and application thereof. Background technique [0002] In recent years, some optoelectronic materials used in OLED devices have become increasingly known. It is well known that aromatic diamine derivatives are used as hole transport materials in OLED devices. When using this type of material, it is necessary to increase the applied voltage of the device to obtain sufficient luminous brightness. , which shortens the life of the device and increases power consumption. To solve these problems, hole injection and hole transport in OLED devices can be significantly improved by doping electron acceptor compounds (document: He Gufeng, Appl. Phys.lett. 85 (2004) 3911-3913). Under the same luminous efficiency, the addition of its electron acceptor compound can greatly reduce the working voltage of OLED devices; strong electron acceptor comp...

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Problems solved by technology

[0003] For methods of improving hole transport (P-doping), the physical properties of the materials used present problems during sublimation purification or vacuum evaporation involving fluorinated tetracyanoquinodimethane (TCNQ or F4TCNQ), due to its small molecular weight, it is easy to diffuse into the equipment during the sublimation process, resulting in contamination of the equipment or devices, so that this type of dopant cannot be used in mass production devices, and the prepared devices have a short service life and are not suitable for commercial applications

[0004] CN103959392A discloses an improved doping method for hole injection and transport layers comprising reacting at least one first compound in neutral form with at least one ionic dopant in a first solvent system to providing a first doping reaction product; isolating the first doping reaction product in solid form; and combining the isolated first doping reaction product with a neutral form of at least one conjugated polymer in a second solvent system to Formation of a second doped reaction product comprising an oxidized form of the conjugated polymer and a neutral form of the first compound; this patent has a relatively short lifetime despite its lower metal content

CN102292839A discloses an OLED stability improved by a doped hole transport layer and an organic light-emitting device, the device comprises an anode and a cathode, a first organic layer is located between the anode and the cathode, the first organic layer comprises The light-emitting layer of the first organic light-emitting material, the device also includes a second organic layer located between the anode and the first organic layer, the second organic layer is a non-light-emitting layer, and the second organic layer contains % concentration of organic small molecule hole transport materials, and organic small molecule electron transport materials with a concentration of 0.1 to 5wt%, this patent makes OLED devices have high stability, but their luminous efficiency is low

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