Organic electroluminescence device and preparation method thereof

Abstract

The invention relates to an organic electroluminescence device and a preparation method thereof. The organic electroluminescence device comprises an anode conductive substrate, a hole injection room, a hole transmission layer, a luminous layer, an electronic transmission layer, an electron injection layer and a cathode which are sequentially stacked, wherein the cathode comprises sodium salt layer, a doping layer and a metallic sulfide layer which are sequentially stacked on the electron injection layer; the material of the sodium salt layer is sodium carbonate, sodium fluoride, sodium chloride or sodium bromide; The material of the doping layer comprises rhenium oxide, a passivation material and metal; the rhenium oxide is rhenium heptoxide, rhenium dioxide, rhenium trioxide or rhenium sesquioxide; the passivation material is silicon oxide, aluminum oxide, nickelous oxide or copper oxide; the metal is magnesium, strontium calcium or ytterbium; the material of the metallic sulfide room is zinc sulfide, cadmium sulfide, magnesium sulfide or copper sulphide. The organic electroluminescence 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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