Fabrication of large-scaled organic light emitting devices on the flexible substrates using low-pressure imprinting lithography

This paper demonstrates an approach to fabricate large-scaled (70 ×70 mm) patterned organic light-emitting devices (ITO/CuPc/NPB/Alq3/LiF/Al) on the flexible polyethyleneterephthalate substrates using low-pressure imprinting lithography. The patterns of the pixel array were defined in crossed-strip style with anode patterned by imprinting techniques followed by wet chemical etching and cathode strips deposited using metal mask. The measured results were: The turn-on voltage of the device was 7.5 V; the luminous efficiency reached 1.13 lm/W (3.04 cd/A) at a luminance of 3.8 cd/m² and its maximum luminance was 2440 cd/m², which were comparable to the performances of the devices patterned by conventional photolithography.