OLED organic luminescent material and preparation method thereof, OLED device and preparation method thereof

Abstract

The invention belongs to the technical field of organic luminescent materials, in particular to an OLED organic luminescent material, wherein the surface of the organic luminescent material powder iscoated with an organic cladding layer, and the surface of the organic cladding layer is coated with an inorganic cladding layer. The invention also provides a preparation method of the OLED organic luminescent material, which comprises the steps of: firstly forming an organic cladding layer on the surface of the organic luminescent material powder by MLD, and then cladding an inorganic cladding layer on the surface of the organic cladding layer by ALD. The invention also provides a preparation method of an OLED device, wherein the OLED organic luminescent material is evaporated and deposited as a luminescent layer. The invention also provides an OLED device prepared by adopting the preparation method. An inorganic cladding layer formed on the surface of organic luminescent material powdercan prevent the organic luminescent material powder from reacting with water or oxygen, thereby prolonging the service life; the inorganic cladding layer and the organic cladding layer will rupture inthe evaporation process, and the organic luminescent material is mixed with the inorganic clad layer and evaporated into the luminescent layer to form doping, and the luminescent efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of organic light-emitting materials, and in particular relates to an OLED organic light-emitting material and a preparation method thereof, an OLED device and a preparation method thereof. Background technique [0002] Organic light-emitting diode (Organic Light-Emitting Diode, OLED) display technology is a new application display technology, because the display technology has the characteristics of simple structure, no backlight, high contrast, thin thickness, fast response, etc. It has gradually become the main display technology of electronic devices such as smartphones and TVs. [0003] An OLED device includes a cathode, an electron transport layer, a light-emitting layer, a hole transport layer, an anode, and a substrate arranged from top to bottom, where the substrate is usually a glass substrate, etc., the anode includes indium tin oxide (ITO), etc., and the cathode includes Mg, Ga , Li, Ag, Al, In; ...

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Problems solved by technology

[0003] An OLED device includes a cathode, an electron transport layer, a light-emitting layer, a hole transport layer, an anode, and a substrate arranged from top to bottom, where the substrate is usually a glass substrate, etc., the anode includes indium tin oxide (ITO), etc., and the cathode includes Mg, Ga , Li, Ag, Al, In; the hole transport layer includes poly(3,4-ethylenedioxythiophene)-polystyrenesulfonic acid (PEDOT:PSS) or P-type metal oxide nanoparticles, etc. , P-type metal oxide nanoparticles including MoO 3 , NiO, V 2 o 5 、WoO 3 At least one of them; the electron transport layer is 1,3,5-tris(N-phenylbenzimidazol-2-yl)-benzene organic material, 8-hydroxyquinoline aluminum (Alq3), etc.; while the OLED device The core of the light-emitting layer is an organic light-emitting material, but the performance of the organic light-emitting material is easily affected by water vapor and oxygen; Although the drying sheet can absorb water vapor and oxygen around the organic light-emitting material, it cannot completely isolate the organic light-emitting material from water vapor and oxygen. The remaining water vapor and oxygen will still reduce the performance of the organic light-emitting material, resulting in organic Reduced service life of light-emitting display devices