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논문 기본 정보

자료유형
학술저널
저자정보
Hong, Yong-Taek (Department of Electrical Engineering and Computer Science, Seoul National University Inter-University Semiconductor Research Center, Seoul National University) Yang, Ji-Hoon (Department of Electrical Engineering and Computer Science, Seoul National University Inter-University Semiconductor Research Center, Seoul National University) Kwak, Jeong-Hun (Department of Electrical Engineering and Computer Science, Seoul National University Inter-University Semiconductor Research Center, Seoul National University) Lee, Chang-Hee (Department of Electrical Engineering and Computer Science, Seoul National University Inter-University Semiconductor Research Center, Seoul National University)
저널정보
한국정보디스플레이학회 Journal of information display Journal of information display 제10권 제3호
발행연도
2009.1
수록면
111 - 116 (6page)

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In this paper, a plasma-assisted patterning method for the organic layers of organic light-emitting diodes (OLEDs) and its effect on the OLED performances are reported. Oxygen plasma was used to etch the organic layers, using the top electrode consisting of lithium fluoride and aluminum as an etching mask. Although the current flow at low voltages increased for the etched OLEDs, there was no significant degradation of the OLED efficiency and lifetime in comparison with the conventional OLEDs. Therefore, this method can be used to reduce the ohmic voltage drop along the common top electrodes by connecting the top electrode with highly conductive bus lines after the common organic layers on the bus lines are etched by plasma. To further analyze the current increase at low voltages, the plasma patterning effect on the OLED performance was investigated by changing the device sizes, especially in one direction, and by changing the etching depth in the vertical direction of the device. It was found that the current flow increase at low voltages was not proportional to the device sizes, indicating that the current flow increase does not come from the leakage current along the etched sides. In the etching depth experiment, the current flow at low voltages did not increase when the etching process was stopped in the middle of the hole transport layer. This means that the current flow increase at low voltages is closely related to the modification of the hole injection layer, and thus, to the modification of the interface between the hole injection layer and the bottom electrode.

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