The effect of diffusing substrate and pillow lenses on the outcoupling efficiency of
organic light-emitting diodes (OLEDs) was studied by optical simulation based on the point-dipole
model. The diffusing substrate included Mie scatterers by which the condition of total internal
reflection could be broken. The finite-difference time-domain method was used to obtain the
intensity distribution on the transparent electrode of an OLED, which was used as a light source to
carry out a ray-tracing simulation of the OLED and the diffusing substrate. It was found that the
outcoupling efficiency of the OLED was sensitive to the thickness of organic layers and could be
increased by 21.0% by adopting a diffusing substrate in which Mie scatterers whose radius was
2.0 μm were included at the density of 10<sup>7</sup>mm<sup>-3</sup> and by 65.5% by forming one pillow lens with the radius of 2 mm
on the front surface of the glass substrate. This study revealed that the outcoupling efficiency
could be improved by adopting diffusing substrate and pillow lenses along with the optimization of
the thickness of each layer in the OLED.
© 2013 Optical Society of Korea
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