Abstract
The effect of permanent dipole on the performance of organic electroluminescent devices (OELDs) was investigated by using a model polyurethane derivative (PU) with large dipoles on its side chain. The used OLEDs emits green color with an emission maximum at 540 nm. Decreases in luminance and current density during a constant voltage driving were observed. Evident spontaneous recovery and reverse bias assisted recovery of the degradation were confirmed. The observed degradation and recovery phenomena were discussed in terms of internal electronic field formation due to the re-orientation of dipole in organic layer.
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