Mode Dispersion in Photonic Crystal Organic Light-Emitting Diodes
Posted on 2020-06-15 - 09:44
Similar
to an electronic lattice determining the motion of electrons
in solids, photonic crystals (PhCs) are periodic photonic nanostructures
that determine the propagation of photons. By incorporating PhCs into
organic light-emitting diodes (OLEDs), the device efficiency and emission
spectra can be modified, which can be explained and predicted by the
mode dispersion. In this work, we experimentally measure the mode
dispersion of 1-D and 2-D PhC OLEDs at different azimuthal angles
with angle-resolved electroluminescence spectra. The results are explained
using an intuitive geometry approach, which shifts and slices the
cone-shaped optical modes to obtain the mode dispersion of PhC OLEDs.
We note that the weak cavity mode and a narrow photonic band gap are
visible only after eliminating the intrinsic emitter spectrum in the
air mode dispersion. In the end, we discuss the implication of mode
dispersion on the OLED light extraction.
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