Organic compound and preparation method and application thereof

Abstract

The invention provides an organic compound as well as a preparation method and application thereof. The organic compound has a structure as shown in a formula I, the organic compound has a relativelyhigh thermal decomposition temperature; the triplet state energy level is high; the energy level difference between HOMO and LUMO is relatively small; HOMO and LUMO energy levels of the compound withthe specific structure are matched with a hole transport layer and an electron transport layer; meanwhile, due to the specific three-dimensional configuration, material molecules cannot be stacked; annihilation caused by existence of high-energy excitons is reduced, the energy transfer efficiency is improved, the luminous efficiency is improved, the driving voltage is reduced, the light-emitting stability is relatively high, the color cast is effectively reduced, the thermal decomposition temperature is high, the thermal stability is relatively high, and the luminous efficiency and the luminous performance of the device are improved.

Description

technical field [0001] The invention belongs to the field of electroluminescent materials, and relates to an organic compound and its preparation method and application. Background technique [0002] In 1987, Dr. Deng Qingyun and others from the laboratory of Eastman Kodak made the first organic light-emitting diode (OLED) device (hereinafter referred to as OLED device) by vacuum evaporation for the first time. (Appl.Phys.Lett.,1987,51,913), they used transparent and conductive indium tin oxide (ITO) as the cathode, and sequentially evaporated diamine derivatives and tris(8-hydroxyquinoline) on it ) aluminum, and magnesium-silver alloy is used as the anode material. This multi-layer structure can reduce the driving voltage of the OLED device and effectively improve the charge injection problem between the material molecule and the electrode interface, thereby improving the device performance and lifespan. [0003] CBP, whose structure is as follows It is a widely used hos...

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Problems solved by technology

[0003] CBP, whose structure is as follows It is a widely used host material with good hole transport properties. However, when CBP is used as a host material, due to the low glass transition temperature of CBP, it is easy to recrystallize, resulting in a decrease in the performance and luminous efficiency of OLED devices.

On the other hand, CBP is a hole-type host material, the transport of electrons and holes is unbalanced, the recombination efficiency of excitons is low, the light-emitting area is not ideal, and the roll-off phenomenon of the device is serious during operation, which leads to the Low efficiency of energy transfer from host material to guest material reduces device efficiency

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