The Studies On Synthesis And Synthetic Process Of Organic Electroluminescent Materials LMY

Organic electroluminescent material LMY that we refer is the compound N,N'-di(4-methylphenyl)-N,N'-di(4-n-butylphenyl)-9.10-diamiophenanthrene.The enthusiasm to the research of organic light-emitting devices (OLEDs) has lasted from 1960s to today. But until now the companies that bring their products to the market is very few. One of the important reasons is the properties of organic electroluminescent materials, which affect the process of industrialization of OLEDs largely. The purpose of the paper is studying on synthesis and synthetic technology of organic electroluminescent material LMY around this topic.Separately starting from 9,10-phenanthrenequinone and benzil, N,N'-di-(4-n-butylphenyl)-9,10-diamiophenanthrene(PHNH) was prepared by two methods.In method 1, N,N'-di(4-n-butylphenyl)-9,10-diamiophenanthrene was obtained starting from 9,10-phenanthrenequinone and 4-n-butylaniline via condensation and reduction. In method 2, N,N'-di(4-n-butylphenyl)-9,10-diamiophenanthrene was obtained starting from benzil and 4-n-butylaniline via condensation, coupling and reduction.The experiment and fact has suggested that the method 1 has higher yield than the original literature, but because of the price of the material in the method 2 is much cheaper than the method 1 and the purity of the product in the method 2 is higher the method 1, so the method 2 has practical value and prospects.N,N'-di(4-methylphenyl)-N,N'-di(4-n-butylphenyl)-9,10-diamiophenanthrene was obtained starting from N,N'-di(4-n-butylphenyl)-9,10-diamio-phenanthrene and 4-methyl iodobenzene via Ullmann, in this reaction we use trichlorobenzene as the solvent instead of using 4-methyl iodobenzene as the solvent. After improvement, the amount of 4-methyl iodobenzene was decreased from 6 equivalence to 2.5-3 equivalence, which reduces the cost of production. At the same time, the yield and purity has been improved.The synthesis process conditions were optimized by examining the effects of single factors, The yield of LMY was up to 44.2% and the purity was 99.1%.Through the above research, a high overall yield, high purity and economic synthetic method with of LMY.