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Organic electroluminescence device

An electroluminescent device and electroluminescent technology, applied in the direction of electro-solid devices, electrical components, semiconductor devices, etc., can solve the problems of light output loss, etc., and achieve the effect of improving the light extraction rate

Active Publication Date: 2011-06-29
GUAN YEOLIGHT TECH CO LTD +1
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Problems solved by technology

The substrate is usually a glass substrate, the refractive index of glass is about 1.5, most of the first electrode is indium tin oxide (hereinafter referred to as ITO), the refractive index of ITO is between 1.8 and 1.9, and the refractive index of the organic functional layer is about 1.75. Since the refractive index of each layer of material is different, when the light generated by the organic light-emitting material passes through the ITO / glass interface or the glass / air interface, it is equivalent to entering the optically sparse medium from the optically dense medium, which will cause total reflection and cause the loss of light output.

Method used

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Embodiment 2-1

[0039]Take Example 2-1 as an example: between the first electrode and the organic functional layer, a photoresist is used to form a layer of reticular light extraction layer. The main active ingredients of the photoresist are urethane acrylate, photoinitiator, Photopolymerizable monomers, organic solvents, leveling agents, antioxidants, etc. The photoresist has a refractive index of 1.36. The thickness of the mesh light extraction layer is 50nm, the figure surrounded by the grid is rectangular, the width of the grid is y, and the spacing of the grid is x. y=5um, x+y=50um. Its structure is: Glass / ITO / network light extraction layer / NPB / NPB:rubrene / BAlq:TBPe / Alq 3 / LiF / Al. The mesh light extraction layer was prepared by the following method:

[0040] (1) Coating: place the glass substrate with the first electrode ITO after cleaning on the spin coater, drop the photoresist on the glass substrate with ITO, set the rotating speed at 1100 rpm, and the time is 30 Second.

[0041...

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Abstract

The invention relates to an organic electroluminescence device, in particular to a device structure for improving light extraction efficiency of the organic electroluminescence device. A reticular light extraction layer made of photoresist is additionally arranged in the device, and the grids of the reticular shape can be rectangles, regular triangles, regular hexagons, etc., through photoetchingprocessing. Owning to the reticular light extraction layer, light incapable of being emitted from the surface of the device due to total reflection is less, and the light extraction efficiency is improved.

Description

technical field [0001] The present invention relates to an organic electroluminescent device (Organic Light Emitting Device, referred to as OLED hereinafter), in particular to a structure for improving the light extraction efficiency of the OLED. Background technique [0002] OLED has attracted widespread attention due to its thin body, large area, full curing, and flexibility, and has important applications in the fields of display and lighting. [0003] The efficiency of OLED needs to be further improved, mainly from two aspects: one is to develop high-performance organic materials, such as high-efficiency phosphorescent materials, and develop and optimize the matching device structure; the other is to adopt technology to improve light extraction rate . [0004] Such as figure 1 As shown, an OLED device generally consists of a substrate 11, a first electrode 12, a second electrode 14, and an organic functional layer 13 sandwiched between the two electrodes. The substrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/52H01L51/56
Inventor 邱勇李艳蕊张国辉
Owner GUAN YEOLIGHT TECH CO LTD
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