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Electroluminescent device with a transparent cathode

An electroluminescence and equipment technology, applied in the field of electroluminescence equipment, can solve problems such as low light transmission rate

Inactive Publication Date: 2010-06-16
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain a sufficiently high conduction capability of the metal layer, a layer thickness of 10 to 30 mm is required, which leads to a low transmission rate of the generated light in the electroluminescent device.

Method used

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  • Electroluminescent device with a transparent cathode
  • Electroluminescent device with a transparent cathode
  • Electroluminescent device with a transparent cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] On a glass disk as substrate 1 a subsequently structured 140 nm thick ITO layer was provided as first electrode 2 . Next, a 200-nm-thick polyethylenedioxythiophene layer as a hole-guiding layer and an 80-nm-thick polymer (p-styrenevinylene) (PPV) layer as an electroluminescent layer 3 were successively provided. A second electrode 4 consisting of a 5 nm thick barium layer and a 15 nm thick aluminum layer is provided on this PPV layer. A 43nm thick ZnS layer was deposited on the aluminum layer.

[0044] image 3 The transmission characteristics of the second electrode are shown in curve 11 of . With uncoated electrodes ( figure 2 Compared with curve 8) in , the transmission rate of the light generated in the electroluminescent layer 3 through the second electrode can be increased. In addition, the transmission rate in the blue spectral region is reduced.

Embodiment 2

[0046] An electroluminescent device similar to that in Example 1 was fabricated except that the second electrode contained a 25 nm thick layer of silver instead of the aluminum layer, and the thickness of ZnS was 38 nm.

[0047] image 3 The curve 10 of the graph shows the transmission rate of the light emitted by the electroluminescent layer 3 on the second electrode 4 . With uncoated electrodes ( figure 2 Compared to curve 7) in , the transfer rate can be increased. In addition, the filter effect in the blue and red spectral regions is maintained.

Embodiment 3

[0049] An electroluminescence device similar to that described in Example 2 was fabricated except that three transparent insulating layers 5 were stacked on the second electrode 4 . The thickness of the first transparent insulating ZnS layer adjacent to the second electrode 4 is 41nm, and the second transparent insulating MgF 2 The layer thickness is 84 nm, while the third transparent insulating ZnS layer has a thickness of 55 nm.

[0050] Figure 4 The transmission characteristic of the second electrode 4 is shown in the curve 12 of . with a single covered electrode ( image 3 Compared with the middle curve 10), this transmission characteristic can be adapted to the emission spectrum of the PPV electroluminescent layer (cf. Figure 4 Middle curve 9).

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Abstract

The invention relates to an electroluminescent device with a transparent cathode. Said electroluminescent device comprises a substrate ( 1 ) and, adjacent to said substrate ( 1 ), a laminated body composed of a first electrode ( 2 ), an electroluminescent layer ( 3 ) and a second metallic electrode ( 4 ). Said second electrode ( 4 ) is covered with transparent dielectric layers ( 5 ), which increase the transmission of light through the second metallic electrode ( 4 ) and serve as filters.

Description

technical field [0001] The present invention relates to an electroluminescent device comprising a substrate and a laminate consisting of a first electrode, an electroluminescent layer and a second electrode. Background technique [0002] Different embodiments of electronically driven display systems based on various principles are well known and have a wide range of applications. [0003] According to one of the stated principles, organic light-emitting diodes, known as OLEDs, are used as light sources. Organic light-emitting diodes consist of several functional layers. In "Philips Journal of Research, 1998, 51, 467", a description is given of the typical structure of OLEDs. A typical structure comprises an ITO (Indium Tin Oxide) layer as transparent electrode (anode), a conductive polymer layer, an electroluminescent layer, i.e. a light-emitting material, especially a light-emitting polymer layer, and an electrode whose metal is preferably a metal with a low work function...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L27/00H05B33/24H01L27/32H01L51/52
CPCH01L51/5221H01L27/322H01L51/5262H01L51/5234H10K59/38H10K50/828H10K50/85
Inventor H·贝希特尔W·布斯特H·F·伯尔纳D·贝特拉姆
Owner KONINK PHILIPS ELECTRONICS NV
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