Abstract
We demonstrate the use of screen printing in the fabrication of highly efficient phosphorescent polymer organic light-emitting devices (OLEDs) based on a green-emitting Ir(ppy)3 and a host polymer PVK. We incorporate PBD in the polymer host as an electron-transporting dopant and α-NPD as a hole-transporting dopant. The best screen-printed single-layer device exhibits very high peak luminous efficiency of 63cd/A at a relatively high operating voltage of 17.1V at the luminance of 650cd/m2. We observed the highest luminance of 21,000cd/m2 at 35V. Due to the high operating voltage, despite of the high peak luminous efficiency the peak power efficiency was found to be 12.2lm/W at the luminance of 470cd/m2 (15.9V).
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