We demonstrate the simulation results of the radiation properties from
top-emitting organic light-emitting devices (top-emitting OLEDs) with two-
and three-microcavity structures based on the general electromagnetic theory.
The parameters of the layer thickness and complex refractive index of each
layer, the locations and density of the oscillating dipoles, and the emission
photoluminescence spectrum are varied to optimize the device performance.
In evaluating the deice performances, the output spectrum, the intensity distribution,
and the viewing-angle characteristics of a top-emitting OLED are concerned.
The simulation results are consistent with the Fabry-Pérot cavity equation,
which can be used as a guideline for designing a two-cavity top-emitting OLED.
In such a design process, the dipole position is chosen first. Then the thicknesses
of the whole organic layer, the semi-transparent
cathode, and the dielectric layer are adjusted for optimizing
the device performance. In a three-cavity top-emitting OLED, not only the
emission intensity and the viewing angle can be optimized at the same time,
but also the emission wavelength can be independently tuned. Besides, the
use of a three-cavity structure helps to narrow the spectral width and increase
the color purity.
© 2006 IEEE
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