Asymmetrically substituted diphenyl pyridine compound as well as preparation and application thereof

Abstract

The invention belongs to the technical field of organic small molecule photoelectric functional materials, and discloses an asymmetrically substituted diphenyl pyridine compound as well as preparationand application thereof. The asymmetrically substituted diphenyl pyridine compound is one or more of a formula I and a formula II. The invention also discloses a preparation method of the asymmetrically substituted diphenyl pyridine compound. The asymmetrically substituted diphenyl pyridine compound is used for preparing an organic electron transport material. The organic electron transport material comprises one or more of the asymmetrically substituted diphenyl pyridine compounds. The asymmetrically substituted diphenyl pyridine compound provided by the invention has high decomposition temperature and glass transition temperature, is suitable for high-stability devices, is easy to remove bromine-containing raw materials and intermediates, and is beneficial to long-term stable operationof OLEDs. As an organic electron transport material, the compound can improve the efficiency of photoelectric devices. As an organic small-molecule electron transport material, the compound disclosedby the invention is applied to the photoelectric devices.

Description

technical field [0001] The invention belongs to the technical field of organic small molecule photoelectric functional materials, and relates to electron transport materials, in particular to asymmetrically substituted diphenylpyridine compounds and their preparation and application. The asymmetrically substituted diphenylpyridine compound is used as an electron transport material, has a high thermal decomposition temperature and a glass transition temperature, and is applied to an electron transport layer of an optoelectronic device such as a high-performance organic light emitting diode. Background technique [0002] Organic light-emitting diodes (OLEDs) consist of electrodes, a charge-transport layer, and an emissive layer. Generally, the hole mobility of organic hole transport materials is higher than the electron mobility of organic electron transport materials (ETMs), and their application in OLED devices will cause device carrier imbalance, which is not conducive to t...

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Problems solved by technology

However, in order to enhance electron mobility, the enhanced conjugation or intermolecular force of ETMs is often increased, which will cause the solubility of organic electron transport materials to decrease, making purification difficult; at the same time, trace residues from reaction raw materials, intermediates or by-products Halogenated impurities will greatly endanger the stability of OLED

[0003] In addition, there is also a trade-off relationship between the glass transition temperature and electron mobility. The improvement of mobility usually requires the enhancement of conjugation or intermolecular forces, which makes the material easy to crystallize and affects the glass transition temperature, which is not conducive to the practical application in the field of OLED devices.

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