We present a RGB multi-color EL display, in which a blue organic EL display was combined with color changing mediums (CCM). The CCM were basically made up of organic fluorescent mediums which changed the emission color from blue to green or red. For the blue organic device, we improved a multilayer structure in which a distyrylarylene (DSA) emitting layer included a slight amount of an amino-substituted DSA dopant. We achieved a high efficiency of 6 Im/W and a life time of 10000 hr at an initial luminance of 100 cd/m~2. Furthermore, the device showed very fast response time of 600 ns. It is possible to operate a simple-matrix panel with 500 lines under a video-rate driving. In order to realize the simple-matrix panel with a large number of micro-pixels, we found new fabrication methods for micro-patterning of theCCM and a cathode. We succeeded in patterning the CCM by a photolithographic process. The cathode was found to be automatically separated to form the pixels by the use of inter-insulator ribs formed on anode electrodes.
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