Organic light emitting device and manufacturing method thereof

Abstract

The invention discloses an organic light emitting device which is provided with a transparent substrate, a first electrode, an organic function layer, a second electrode and an optical coupling film layer. The first electrode, the organic function layer and the second electrode are arranged on one face of the transparent substrate and sequentially stacked, and the optical coupling film layer is arranged on the other face of the transparent substrate. The optical coupling film layer is provided with a layer body and a patterned layer arranged on the surface of the layer body; or the optical coupling film layer is provided with a layer body and micro holes distributed in the layer body or distributed in the surface of the layer body; or the optical coupling film layer is provided with a layer body, micro holes distributed in the layer body or distributed in the surface of the layer body, and a patterned layer arranged on the surface of the layer body. A manufacturing method of the organic light emitting device comprises the steps of (a) manufacturing the first electrode, the organic function layer and the second electrode on one face of the substrate in sequence, and (b) manufacturing the optical coupling film layer on the other face of the substrate. The organic light emitting device has the advantages of being easy to process, and good in light taking-out effect.

Description

technical field [0001] The invention relates to the technical field of organic semiconductors, in particular to an organic electroluminescence device with improved light extraction rate and a preparation method thereof. Background technique [0002] OLED (English full name is Organic Light Emitting Diodes, meaning organic electroluminescent device, referred to as OLED) has active light emission, wide viewing angle, light weight, wide temperature range, large area, full curing, flexibility, low power consumption, responsive With many advantages such as high speed and low manufacturing cost, it has important applications in the fields of display and lighting, and has attracted more and more attention from academia and industry. [0003] In the prior art, transparent glass is generally selected as the substrate of the OLED device. The refractive index of the glass is generally about 1.55, the refractive index of the organic electroluminescent material layer is generally about 1...

AI Technical Summary

Problems solved by technology

The sandblasting process is to use a custom-made sandblasting machine to spray small particles with a diameter of micron to the surface of the glass substrate at a specific angle and speed. The impact of high-speed particles on the outer surface of the substrate will inevitably bring damage to the entire device. The corresponding mechanical vibration disturbs the good arrangement of molecules in the OLED layer, which will have a great impact on the optical and electrical properties of the device, thus affecting the life and stability of the OLED.

When using chemicals to directly corrode the glass surface, the same batch of products may have completely different external surface morphology, which makes the uniformity of the device poor, which is not conducive to commercial production

Regardless of whether sandblasting or chemical etching is used, there will be varying degrees of image blur

[0008]2) When microlenses are used to improve light extraction efficiency, the microlens film requires a micron-level planar matrix array, which requires very precise control of dimensions and stricter processes , leading to complex preparation process and high cost

In addition, if the microlens technology is to be applied to the display field, the microlenses need to be shrunk and arrayed, but at this time the alignment with the substrate becomes very important, and the substrate should not be too thick (<0.5mm), otherwise adjacent pixels will will interfere with each other, and the image display is blurred

In any case, when using the microlens process to enhance the light extraction effect, there will always be varying degrees of image blur

[0009]3) When using a single-layer optical coupling film, the basic manufacturing method of this method is to deposit a specific material on the outer surface of the OLED, such as MgF2, although its refractive index is 1.38 (wavelength 550 nm), which is between air and glass, its refractive index varies with wavelength. For monochromatic light, the light extraction of each wavelength band requires MgF2The thickness is different, and precise control is required, and this method is obviously not conducive to the light extraction effect of white light, and the extraction effect of this method is relatively poor

However, the use of multi-layer optical coupling layers has higher process costs, and the selection of materials is less

[0010]4) Pasting with light extraction film, the light extraction effect is poor, because the adhesive layer with matching refractive index is required, and the light transmission of the adhesive layer is also limited Requirements, resulting in less selection range of this bonding layer, the light extraction efficiency obtained by the existing method is generally only 20%~30% improved

[0011]5) Coating a scattering layer is an effective method of light extraction. This method is easy to process and has a better light extraction effect. After mixing and grinding the solvent and solvent, filter the filtrate, and then mix the obtained filtrate with the matrix to prepare the scattering layer solution, which makes the process relatively complicated, and it is inevitable that there will be agglomeration among the scattering particles, which will affect the light extraction effect.

[0012](6) Porous films are obtained by chemical methods, the adjustment of process parameters is complicated, and expensive equipment is also required in the process

[0013] It can be seen that the processing methods in the prior art generally have the characteristics of affecting other performances of the device or the preparation process is complicated.

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