Abstract
Using a Ca (10 nm) Ag (10 nm) 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 4.6 V and clean electrophosphorence peaks at 616 and 674 nm are reported. X-ray photoelectron spectroscopy depth profiling measurements reveal the presence of Ca (OH)2 in CaAg bilayer cathode and the skin depth over 15 nm in the visible region is determined in this structure. Results show that the compositional modification of the CaAg cathode enhances its optical transparency and final performance of the electrophosphorescent top emission device.
Original language | English |
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Article number | 253508 |
Journal | Applied Physics Letters |
Volume | 89 |
Issue number | 25 |
DOIs | |
State | Published - 2006 |