Preparation method of organic electro luminous material 8-hydroxy quinoline aluminium

Abstract

A process for preparing electroluminescent organic 8-hydroxyquinoline aluminium includes such steps as mixing 8-hydroxyquinoline crystal, aluminium chloride, alcohol and distilled water to obtain a solution, reaction in a sealed container, filtering, vacuum pumping filtering, washing, distilling for purifying, and baking dry. Its advantages are high efficiency, low cost, and high quality and purity of the product.

Description

technical field [0001] The invention relates to a preparation method of an organic electroluminescent material 8-hydroxyquinoline aluminum, which belongs to the technical field of research and manufacture of organic electroluminescent materials and devices. Background technique [0002] As early as the 1930s, organic electroluminescence began to be studied. Due to limited conditions, organic electroluminescent materials could only be dispersed in polymers to form thin films, and limited electroluminescent devices were obtained. By the 1960s Single crystal electroluminescence such as anthracene and naphthalene appeared in the 1990s, so the light output can only be observed when the driving voltage is greater than 100 volts, and its luminescent materials, electrode materials, and driving voltages are quite backward. [0003] In order to reduce the driving voltage and make the material thinner, the vacuum evaporation method is used to prepare the thin film. The driving voltage ...

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Problems solved by technology

[0003] In order to reduce the driving voltage and make the material thinner, the vacuum evaporation method is used to prepare the thin film. The driving voltage is still greater than 30 volts, and the quantum efficiency of the device is also very low, only 0.05%. Light-emitting materials and hole-transport materials have made high-brightness, high-efficiency light-emitting devices that can be driven at a voltage of less than 10 volts, but advanced industrial applications are still not possible

[0004] Organic electroluminescent materials have good semiconductor characteristics, high luminous efficiency, easy conduction of electrons or holes, suitable melting point, that is, 200°C-400°C, good film-forming properties, and can form uniform, dense and pinhole-free few Ten nanometer thick film, and good stability, but it is very difficult to obtain high-purity organic compound electroluminescent materials, although some developed countries and my country have invested more scientific research and experiments in recent years, but it is far from high-level There is still a certain gap in the industrial application of organic electroluminescent materials, especially in the production of high-purity organic electroluminescent materials. The production of hydroxyquinoline aluminum material is even more disparate, and the technology is backward, the cost is high, the purity is low, and the quality is poor. It is impossible to obtain high-purity 8-hydroxyquinoline aluminum in large quantities, and its extraction yield is only 70-80%. %, which has a great impact on the wide application of this material and the industrial production of such light-emitting devices

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