Abstract
We demonstrate the improvement of device lifetime by organic light-emitting devices with an iodogallium phthalocyanine (IGaPc) layer fabricated on indium tin oxide (ITO) treated with positive oxygen ions. The device performance improves markedly as follows: (a) long-term stability (an operational half-lifetime of 100 h at high current density of 100 mA/cm2), and (b) the driving voltage is unchanged. The change in the device characteristics is attributed to changes in IGaPc molecular configurations during the growth process, leading to enhanced hole injection from the ITO to IGaPc layer.
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