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Reduced efficiency roll-off in phosphorescent organic light emitting diodes at ultrahigh current densities by suppression of triplet-polaron quenching
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High-performance phosphorescent organic light emitting devices with reduced efficiency roll-off at ultrahigh current densities were realized. The devices were -based phosphorescent organic light emitting diodes that employed 1,3-bis[2-(-bipyridine-6-yl)-1,3,4-oxadiazo-5-yl]benzene as a high mobilityelectron transfer layer. The device’s brightness was enhanced while the efficiency roll-off was reduced. The device exhibits high current efficiency at high brightness, with a maximum luminescence of at over (with an efficiency of ). This reduction in efficiency roll-off is attributed to the suppression of the triplet-polaron quenching rate through balancing the charge carrier ratio in the device.
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