Method for creating serially-connected OLED devices
By the invention it is proposed a method of preparing a serial connection of OLED-devices, comprising the steps of providing a carrier substrate; depositing a first electrode material layer on said carrier substrate; depositing a layer of an organic optoelectronic active material on said first electrode material layer; depositing a second electrode material layer on said organic optoelectronic active material layer; ablating at least the second electrode material layer and the organic optoelectronic active material layer at least in selected areas to build a trench forming separated OLED-devices on the carrier surface; electrically interconnecting neighboring OLED-devices by connecting the anode of a first OLED-device to the cathode of a neighboring second OLED-device, wherein in the steps of depositing the organic optoelectronic active material layer and the cathode layer, the carrier substrate surface is covered over its entire functional area with said layers, and wherein the electrical interconnection of the neighboring OLED-devices is performed by at least partially filling the trenches built in the ablating step with an electrical conductive material. Furthermore, an illuminant is provided comprising serial connected OLED-devices.
1. An illuminant comprising at least two serially and electrically connected OLED-devices, wherein each the OLED-devices comprises at least a first electrode material layer, an optoelectronic active material layer and a second electrode material layer, wherein the at least two OLED-devices are formed on a common carrier substrate in a pattern having a pattern size of less than 200 μm and wherein, in a first OLED-device of said at least two OLED-devices, the second electrode material layer is disposed above said optoelectronic active material layer, the optoelectronic active material layer is disposed above said carrier substrate and above said first electrode material layer, and a portion of said optoelectronic active material layer extends horizontally beyond an edge of said second electrode material layer.
2. An illuminant according to claim 1 , wherein the at least two OLED-devices are separated by a trench and the first electrode material layer of a first OLED-device of the at least two OLED-devices is connected to the second electrode material layer of a second OLED-device of the at least two OLED-devices by a conductive material filling at least partially the trench.
3. The illuminant according to claim 2 , wherein the conductive material is a paste which can be annealed.
4. An illuminant according to claim 3 , wherein the conductive material can be annealed by thermal and/or UV-exposure.
5. An illuminant according to claim 2 wherein the conductive material is selected from the group consisting of metal pastes, conductive polymers and conductive glues.
6. The illuminant according to claim 1 , wherein the first electrode material layer of a second OLED-device of the at least two OLED-devices is connected to the second electrode material layer of the first OLED-device by a conductive material, wherein at least a portion of the conductive material is in contact with a top of said portion of said optoelectronic active material layer of said first OLED-device.