Abstract
One of the key issues of a large-area organic light-emitting diode (OLED)
for flat panel lighting applications is to enhance the uniformity of light
emission. In this work, we have investigated the effect of an auxiliary
metal (chrome) electrode in association with a device configuration on the
luminance uniformity of a large-area (15$\times$15 cm$^{2}$) white OLED. We demonstrate that the ratio between the effective
horizontal resistance of anode (indium–tin–oxide (ITO)
with the grid patterned metal electrode) and the vertical resistance of the
OLED device is the critical factor to determine the luminance uniformity.
Moreover, the luminance uniformity is shown to be a function of the current
density and degraded with increasing current density. Namely, the OLED panel
with the 200-$\mu$m-wide metal lines exhibits the luminance uniformity as high as
90% at 200 mA and 85% at 500 mA.
© 2009 IEEE
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