Suppression of roll-off characteristics of electroluminescence at high current densities in organic light emitting diodes by introducing reduced carrier injection barriers

Several experimental analyses are conducted to explain the mechanisms involved in the suppression of the roll-off characteristics of electroluminescence efficiency exhibited by the organic light emitting diodes at high current densities. At the current densities above 100 A/[cm.sup.2], the diodes are shown to exhibit the suppression with a balanced bipolar injection and transport.