A kind of organic host material and electroluminescent device

Abstract

The present invention provides an organic host material and an electroluminescent device thereof. The organic host material has the following structure: the organic host material provided by the invention includes an aromatic amine unit with good electron donating ability, which is formed by a saturated carbon atom and a pure carbon Hydrogen aromatic rings or nitrogen-containing aromatic heterocycles with strong electron-pulling ability are connected in a non-conjugated manner, which can effectively control the conjugated length of the host material molecule, so that the material has a higher triplet energy level; in addition, because saturated carbon atoms are sp 3 Hybrid configuration, the main material molecules have a three-dimensional configuration to ensure that the material can inhibit accumulation, and the main material has a relatively large molecular weight and a relatively rigid molecular structure, so that the material has good thermal stability, and its glass transition temperature T g Greater than or equal to 150°C; the modification of the alkyl chain can increase the solubility of the material, effectively promote the solution processing performance of the material, and ensure the film-forming stability of the material.

Description

An organic host material and electroluminescent device technical field The present invention relates to the field of organic electroluminescent materials, in particular to a kind of organic host material and electroluminescent device thereof pieces. Background technique Organic light-emitting diodes (organic light-emitting diodes, OLED), have self-luminescence, when responding With the characteristics of short time, wide operating temperature range, low driving voltage, low energy consumption, light weight, high flexibility, etc., in the new generation of flat panel display technology technology, solid-state lighting, flexible display, transparent display and other aspects have broad application prospects, so it is greatly favored by the domestic and foreign scientific and technological circles and Industry attention. [0003] Phosphorescence and thermally activated delayed fluorescence (thermally activated delayed fluorescence, TADF) The light-emitting diode of th...

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide an organic host material and an electroluminescent device thereof, aiming at solving the problem of thermal stability and composition of the existing host material due to insufficient three-dimensional molecular structure and small molecular weight. The film properties are poor, which leads to the problem of poor performance of electroluminescent devices

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