Organic electroluminescence device and manufacturing method for organic electroluminescence device

Abstract

The invention discloses an organic electroluminescence device. The organic electroluminescence device comprises a glass substrate, a scattering layer, a positive pole, a hole-injection layer, a hole-transmission layer, a light-emitting layer, an electronic transmission layer, an electronic injection layer and a negative pole which are sequentially overlapped, wherein the scattering layer comprises a metal oxide layer, a light-emitting material layer and an iron salt layer; the HOMO energy level of the material of the metal oxide layer is between -5.2 eV and -6.0 eV; the material of the light-emitting layer is selected from one and more of 4-(dicyanomethyl)-2-butyl-6-(1,1,7,7-tetramethyljulolidine-9-ethenyl)-4H-pyran, 9,10-di-beta-naphthyl anthracene, 4,4'-di(9-ethyl-3-vinylcarbazole)-1-1'-biphenyl and 8-hydroxyquinoline aluminum; the material of the iron salt layer is selected from one and more of iron chloride, iron bromide and iron sulfide. The organic electroluminescence device is relatively high in light-emitting efficiency. The invention also provides a manufacturing method for the organic electroluminescence device.

Description

technical field [0001] The invention relates to an organic electroluminescent device and a preparation method thereof. Background technique [0002] The luminescence principle of organic electroluminescent devices is based on the action of an external electric field, electrons are injected from the cathode to the lowest unoccupied molecular orbital (LUMO) of organic matter, and holes are injected from the anode to the highest occupied molecular orbital (HOMO) of organic matter. Electrons and holes meet, recombine, and form excitons in the light-emitting layer. Excitons migrate under the action of an electric field, transfer energy to the light-emitting material, and excite electrons to transition from the ground state to the excited state. The excited state energy is deactivated by radiation to generate photons , releasing light energy. [0003] In traditional light-emitting devices, only about 18% of the light inside the device can be emitted to the outside, while the rest...

AI Technical Summary

Problems solved by technology

[0003] In traditional light-emitting devices, only about 18% of the light inside the device can be emitted to the outside, while the rest will be consumed outside the device in other forms, and there is a difference in refractive index between the interfaces (such as between glass and ITO). The difference between the refractive index, the refractive index of glass is 1.5, ITO is 1.8, the light from ITO reaches the glass, and total reflection will occur), which causes the loss of total reflection, resulting in lower overall light extraction performance

Images