Organic electroluminescence device and preparation method thereof

Abstract

The invention relates to an organic electroluminescence device and a preparation method thereof. The device comprises a cathode, wherein the cathode comprises a crystallizing layer, a first doping layer and a second doping layer and a second doping layer; the material of the crystallizing layer is 1,2,4-triazole derivatives, 2,2'-(1,3-phenyl)bi[5-(4-tertiary butyl phenyl)-1,3,4-oxadiazole], 2,9-dimethyl-4,7-diphenyl-1,10-orthophenanthrolene or 2,8-bi(diphenyl phosphine oxygroup)dibenzanthracene[b,d]thiophene; the material of the first doping layer comprises rhenium oxide and metallic sulfide; the rhenium oxide is rhenium heptoxide, rhenium dioxide, rhenium trioxide or rhenium sesquioxide; the metallic sulfide is zinc sulfide, cadmium sulfide, magnesium sulfide or copper sulphide; the material of the second doping layer comprises fullerene derivative and metal; the fullerene derivative is footballene, carbon 70, PC61BM or P71BM; the metal is magnesium, strontium, calcium or ytterbium. The device is high in luminous efficiency.

Description

technical field [0001] The invention relates to the technical field of electroluminescence, in particular to an organic electroluminescence device and a preparation method thereof. Background technique [0002] In traditional organic electroluminescent devices, in order to match the cathode with the LUMO energy level of the organic material, the work function of the cathode is generally required to be as low as possible. If the work function is too low, it proves that the metal is easy to lose electrons, very active and stable. poor. Therefore, in the field of organic electroluminescence, metals with moderate work functions such as Ag or Al are generally used as cathodes. On the one hand, these materials have a low work function value of about 4.5eV, and their properties are relatively stable. However, they are different from organic materials. There is still a potential barrier of 1.5eV between them, which still greatly hinders the transport of electrons, thus affecting th...

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Problems solved by technology

[0002] In traditional organic electroluminescent devices, in order to match the cathode with the LUMO energy level of the organic material, the work function of the cathode is generally required to be as low as possible. If the work function is too low, it proves that the metal is easy to lose electrons, very active and stable. poor

Therefore, in the field of organic electroluminescence, metals with moderate work functions such as Ag or Al are generally used as cathodes. On the one hand, these materials have a low work function value of about 4.5eV, and their properties are relatively stable. However, they are different from organic materials. There is still a potential barrier of 1.5eV between them, which still greatly hinders the transport of electrons, thus affecting the luminous efficiency of organic electroluminescent devices.

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