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Electroluminescent device with homogeneous brightness

An electroluminescence device and electroluminescence technology, which are applied to organic semiconductor devices, electric solid state devices, semiconductor devices, etc., can solve the problems of reduced visible transmission of electrodes, increased manufacturing cost, inability to obtain, etc., and achieve uniform light emission, Simple cost, effect of reducing layer resistance

Inactive Publication Date: 2006-08-23
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this leads to an increase in fabrication cost and a decrease in the visible transmission of the electrode
Although metals have considerably lower resistivities than ITO, to obtain sufficient visual transparency, the layer thickness of metal electrodes must be thin enough that no significant advantage is obtained as a result

Method used

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  • Electroluminescent device with homogeneous brightness
  • Electroluminescent device with homogeneous brightness
  • Electroluminescent device with homogeneous brightness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A glass substrate 1 of 356 mm x 356 mm was coated with a photosensitive layer of polyurethane. The polyurethane layer was exposed and polyurethane was removed in bands with a width of more than 200 μm at intervals of 20 mm.

[0046]Subsequently, the glass was removed by sandblasting in areas not covered by polyurethane. The depth of the groove was 350 μm.

[0047] Once the remaining areas of the polyurethane layer have been removed, the recesses in the substrate 1 comprising glass are filled with a conductive silver paste by several screen printing operations.

[0048] Multilayers of the layer assembly are then applied using known methods, for example a first electrode 2 comprising ITO, a hole transport layer comprising polyethylenedioxythiophene (PDOT) and poly(styrenesulfonate), a field comprising PPV Luminescent layer 3 and a second unstructured electrode 4 comprising a 5 nm thick first layer with barium and a 200 nm thick second layer with aluminum.

[0049] An e...

Embodiment 2

[0051] A Cu wire grid of individual wires with layers 400 μm thick and 200 μm wide rolled into a stationary liquid glass substrate. The distance between the individual lines is 25 mm.

[0052] After cooling and curing the glass substrate 1 , further layers are applied in a manner analogous to Example 1.

[0053] An electroluminescent device with improved uniformity of emission is obtained.

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Abstract

The invention describes an electroluminescent device equipped with a substrate, a metallic structure and a layer assembly comprising at least a first electrode, an electroluminescent layer and a second electrode. The metallic structure, which is in electrical contact with the first electrode, exhibits a lower layer resistance than the first electrode. Owing to the electrical contact with the first electrode, the layer resistance of the first electrode, and thus the voltage drop over the first electrode, is reduced.

Description

technical field [0001] The invention relates to an electroluminescent device provided with a substrate and a layer assembly comprising at least a first electrode, an electroluminescent layer and a second electrode. Background technique [0002] Electronically triggered display systems are well known and widely encountered in various embodiments according to various principles. [0003] One principle uses organic light-emitting diodes, ie OLEDs, as light sources. Organic light-emitting diodes consist of several functional layers. Typical structures of OLEDs are described in "Philips Journal of Research, 1998, 51, 467". A typical structure comprises an ITO (Indium Tin Oxide) layer as transparent electrode (anode), a conductive polymer layer, an electroluminescent layer, that is a layer of light emitting material, especially a light emitting polymer, and an electrode (cathode) comprising a metal, preferably with Metals with low work function. Such structures are generally a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/10H01L51/52
CPCH01L51/5212H01L51/52H01L2251/5361H10K50/80H10K50/814
Inventor H·-H·贝奇特D·伯特拉姆
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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