Abstract
Using a Ca (10nm)∕Ag (10nm) semitransparent cathode and efficient electron transport and/or buffer layer, red electrophosphorescent top emission organic light-emitting device has been fabricated. A low turn-on voltage of 4.6V and clean electrophosphorence peaks at 616 and 674nm are reported. X-ray photoelectron spectroscopy depth profiling measurements reveal the presence of Ca(OH)2 in Ca∕Ag bilayer cathode and the skin depth over 15nm in the visible region is determined in this structure. Results show that the compositional modification of the Ca∕Ag cathode enhances its optical transparency and final performance of the electrophosphorescent top emission device.
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