Impacts of Degradation on Annihilation and Efficiency Roll-Off in Organic Light-Emitting Devices

摘要

Efficiency roll-off and intrinsic luminance degradation are two of the primary limitations of organic light-emitting devices(OLEDs). While both phenomena have been studied separately in detail, they are rarely considered together. Previousanalyses of OLED degradation have largely neglected changes in efficiency roll-off and bimolecular quenching, and themagnitude of these changes and their impact on device lifetime remains unclear. We present experimental and modelingresults to quantify the magnitude of these changes, which we find range from ～2% to above 10% in magnitude and increasein importance at high brightness or in devices with significant exciton-exciton annihilation.