The fabrication of color-tunable organic light-emitting diode displays via solution processing

摘要

Using a tandem design of stacked organic emitters, color-tunable organic light-emitting diodes (OLEDs) have been made by solution processing. Conventional displays consisting of red, green and blue pixels arranged in a two-dimensional array suffer from limited resolution. Now, scientists in Germany and China have demonstrated a 4 × 4 pixel matrix color-tunable display that uses the color-tunable OLEDs as pixels. Each pixel consists of two OLEDs, which are stacked vertically and emit different colors. A thin layer of conductive silver nanowires is used as a transparent intermediate charge-injection electrode, which allows the emission intensity and color of the tandem device to be controlled. Compared with the conventional approach, the stacked approach is easier to manufacture and allows for smaller pixels and thus a higher resolution display.