We report on the nature of the resonant modes in organic planar microcavities featuring semi-transparent metallic layers. We theoretically demonstrate that symmetric microcavities support a total of four modes originating from the coupling of surface plasmon polaritons. For red top-emitting organic light-emitting diodes with one semi-transparent metallic electrode, we identify three coupled plasmonic modes and calculate a light outcoupling efficiency close to 34% when assuming emitters with isotropic transition dipole moment. This value is estimated to increase to 50% in the case the dipole moment is purely horizontal.

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We define the overall symmetry of the plasmonic modes with respect to the center of the optical structure. With reference to thin metallic layers, a monotonic field profile within the slab is defined as antisymmetric. On the other hand, a profile exhibiting a maximum or minimum of the field within the metal slab is defined as symmetric.
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