Process for preparing organic electroluminescence material bis (8-hydroxy quinoline lithium sodium)

Abstract

The present invention relates to a kind of organic electroluminescent material bis(8-hydroxy quinoline lithium sodium), which is prepared with 8-hydroxy quinoline, lithium hydroxide and sodium hydroxide as materials, acetone and deionized water as solvent, and nitrogen as protecting gas, and through the steps of compounding solution, synthesis reaction, washing and filtering, re-crystallization to purify, vacuum stoving and final vacuum sublimation to purify to obtain blue light emitting high purity bis(8-hydroxy quinoline lithium sodium) powder. Owing to sodium ion for emitting light and electron injection, the bis (8-hydroxy quinoline lithium sodium) material is superior to 8-hydroxy quinoline lithium and has the features of good filming performance, long fluorescence life, high color purity, high light emitting efficiency, etc. The present invention may be used widely in electronic information display and lighting technology.

Description

technical field [0001] The invention relates to a preparation method of an organic electroluminescent material 2 (8-hydroxyquinoline lithium sodium), which belongs to the technical field of organic electroluminescent material research and material synthesis methods. Background technique [0002] Since C.W.Tang of the American Kodak Company first reported the use of 8-hydroxyquinoline aluminum as an organic electroluminescent device in 1987, the research on organic electroluminescent materials has achieved many results, and more and more organic electroluminescent materials have been developed and developed. Among many organic electroluminescent materials, 8-hydroxyquinoline organometallic complexes have the characteristics of good film-forming properties, high luminous efficiency, high luminous brightness, high electron transport rate, high glass transition temperature and simple synthesis process. It is widely used in various organic electroluminescent devices. [0003] 8-...

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Problems solved by technology

[0003] 8-hydroxyquinoline aluminum, 8-hydroxyquinoline zinc and 8-hydroxyquinoline lithium are the three most mature 8-hydroxyquinoline organometallic complexes, and 8-hydroxyquinoline lithium has a strong blue fluorescence effect , after it is made into an organic electroluminescent device, because the interface contact between the 8-hydroxyquinoline lithium light-emitting layer and the hole transport layer is easy to form an exciplex to emit light, resulting in a widening of the emission spectrum, resulting in the entire light-emitting device It emits blue-green light and can affect its luminescent performance. It is for this reason that the application of 8-hydroxyquinolate lithium as a blue-light organic electroluminescent material is limited. The introduction of sodium ions into 8-hydroxyquinolate lithium molecules not only It can achieve relatively pure blue light emission, and more importantly, it can improve its luminescent performance. At present, there is no ideal method for preparing blue light-emitting 2(8-hydroxyquinoline lithium sodium), and most of them are still under discussion. In this A technical field is still a scientific research gap

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