Abstract
We report the correlation between charge injection and charge balance using lithium fluoride/aluminum cathode and iridium oxide -coated indium tin oxide (ITO) anode in organic light emitting diodes (OLEDs). The turn-on voltage decreased from and luminous efficiency at increased from due to the presence of LiF and the high work function of . When was used in the anode region, the luminous efficiency increment rate decreased from 40% in Al cathode OLED to 7% in cathode OLED. The value of the carrier density suggested that the majority carrier changed from electrons in ITO- OLEDs to holes in ITO/ OLEDs, reducing the rate of increase. Therefore, it has been considered that charge injection should be increased and balanced in order to maximize the luminous efficiency.
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