Organic electroluminescent devices

Abstract

This invention relates to an organic electroluminescent device (1) produced with less effort comprising a substrate (2), a substrate electrode (3) on top of the substrate (2), an electroluminescent layer stack (4) with at least one organic light emitting layer on top of the substrate electrode (3), a counter electrode (5) at least covering the electroluminescent layer stack (4), and a short prevention layer (6) covering the counter electrode (5) establishing a double layer (DL) of counter electrode (5) and short prevention layer (6), and an electrically isolating layer at least partly on top of the short prevention layer, where a tensile stress (TS) is induced to the double layer (DL) by the short prevention layer (5) suitable to roll-up (10) the double layer (DL) after deposition of the electrically isolating layer (8) adjacent to a cut introduced at least to the double layer (DL); in an area, where the double layer (DL) is arranged on top of the electroluminescent layer stack (4) suitable to electrically disconnect the counter electrode (5) from the substrate electrode (3), where the electrically isolating layer (8) at least partly covers the area of the double layer with introduced cut (7) to partly dissolve the electroluminescent layer stack (4) to weaken the adhesion of the double layer to the electroluminescent layer stack adjacent to the cut to roll-up the double layer in the vicinity of the cut. The invention further relates to a method of manufacturing such an OLED device.

Description

technical field [0001] The present invention relates to an OLED device produced with less effort and to a method of manufacturing such an OLED device. Background technique [0002] Organic electroluminescent devices (OLEDs) consist of very thin layers of organic substances on top of a glass substrate covered with a conductive but optically transparent oxide, usually indium tin oxide (ITO). The ITO forms the substrate electrode (typically the anode) and the evaporated aluminum layer (100 nm) on top of the organic stack forms the counter electrode (typically the cathode). When a voltage between 2V and typically 5V is applied between these electrodes, current is injected into the organic layer and light is generated. The fabrication of OLEDs requires that all individual layers be structured to provide reliable operation over time, in particular, to operate an OLED, the two electrodes must be electrically insulated from each other. Therefore, usually at least three masking pro...

AI Technical Summary

Problems solved by technology

Misalignment of the mask can lead to deposition failure, making the operation of the OLED impossible, for example by electrically shorting the electrodes due to misalignment of the counter electrode mask

Many additional measures have to be applied in order to achieve a reliable coating process which makes the process very expensive, see eg EP 1202329 A2

All these measures result in a manufacturing process that requires extreme effort to achieve a good product yield (low failure rate)

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