Single Isolation Structure for Organic Light-Emitting Diodes

概要

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We have developed a single isolation structure for small molecule organic light-emitting diodes (OLEDs), where the insulator and cathode separators are formed by a single layer of image reversal photoresist to shorten the fabrication process and to increase the aperture ratio. The single isolation structure and its process parameters are described in this paper. Because the single isolation structure simultaneously forms the insulator and cathode separators with a single layer, the number of process steps is reduced by 29% compared with that of a conventional bilayered isolation structure, where the insulator and cathode separators are formed by a positive photoresist and a negative photoresist, respectively. Moreover, since the adhesion problem at the interface between the insulator and cathode separators is eliminated, their width is reduced to increase the aperture ratio. In addition, to verify its applicability and reliability, 1.17$''$ $96 \times \text{RGB} \times 96$ passive matrix OLEDs are fabricated using the single isolation structure.
2009-02-25