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Flexible organic electroluminescent device

An electroluminescent device and organic technology, applied in electroluminescent light sources, electro-solid devices, electro-light sources, etc., can solve the problems of high cost, easy saturation of light-emitting devices, poor film-forming properties, etc. The effect of bonding force and air tightness improvement

Inactive Publication Date: 2004-06-30
TSINGHUA UNIV
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Problems solved by technology

The disadvantage of this method is that the cost is high and the process is complicated.
Because the film-forming properties of the ITO film on the polyester substrate are not good, some people propose to use other materials as the anode, such as Cao Yong mentioned in US5,965,281 that polythiophene can be used instead of ITO as the anode, but because polythiophene is not as conductive as ITO , the light-emitting device prepared by using it as the anode is easy to saturate, and the luminous brightness is not as good as the device using ITO
[0006] In the patent with the international application number WO98 / 07173 and the Chinese application number 97197902.2, G. Gu, P. Burrows, S.R. Forrester and others used polyester as the substrate and ITO as the transparent electrode, and prepared ITO by evaporation. / TPD / Alq 3 / Mg:Ag / Ag structure flexible OLED, the device has a certain degree of flexibility, but this patent does not solve the above-mentioned problems of poor stability and electrode adhesion faced by flexible OLEDs

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Embodiment

[0015] In the structural diagram of the preferred embodiment of the present invention shown in the accompanying drawings, the flexible substrate 1 of the device is any suitable flexible polymer sheet, such as polyester material. Preferably, the flexible substrate can be bent to a radius of curvature of 0.5 cm or less. A layer of PI is prepared on the flexible substrate 1 as a buffer layer 2 , and a layer of ITO thin film is deposited on the buffer layer 2 as an anode layer 3 . In this preferred embodiment, the hole transport layer 4 is composed of N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'-biphenyl-4,4' - Composed of diamine (TPD), the electron transport layer 5 is made of tris (8-hydroxyquinoline) aluminum (Alq 3 ) composition, and other non-polymeric materials, such as those known in the art for the preparation of hole transport layers, electron transport layers, and emissive layers, may also be used. TPD used as the hole transport layer 4 is formed on the surface of the ...

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Abstract

A flexible organic electroluminescent device is sequentially composed of flexible substrate layer, buffer layer made of insulating material, anode layer, organic luminous layer consisting of at least one electronic transfer layer or hole transfer layer, and cathode layer. Its advantages are high adhesion between anode (ITO film) and substrate, high air tightness of substrate, high stability and long service life.

Description

technical field [0001] The invention relates to a flexible organic electroluminescent device. Background technique [0002] In 1987, C.W.TANG and others from Kodak Corporation of the United States successfully developed low driving voltage (<10V), high brightness (>1000cd / m2) by using organic phosphors and hole transport materials. 2 ), high luminous efficiency (> 1.51m / W) organic electroluminescent device (OLED). This work shows the great application value of organic electroluminescence (OEL) technology in the field of display. Organic thin-film EL devices have the characteristics of DC low-voltage drive matching integrated circuits, and are easy to realize large-area color display. They have the advantages of fast response speed, easy processing, good mechanical properties, and low cost. [0003] In the prior art, most OLEDs use glass as a substrate, and an indium tin oxide (ITO) layer deposited on the substrate is widely used as a transparent anode of the devic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/52H05B33/12
Inventor 王立铎段炼邱勇高裕弟张德强
Owner TSINGHUA UNIV