Abstract
In a microcavity that consists of an emissive layer, a filler layer and resonator mirrors, we observed the emission enhancement with a higher photoluminescence (PL) intensity and a narrower linewidth than those of the noncavity type. The modification of the PL characteristics by the microcavity structure is described using the model that treats the microcavity as a Fabry–Perot resonator and regards the emissive material as an assembly of emitting dipoles. Also, we obtained the reflectivity and the phase shift of the distributed feedback (DFB) mirror using an optical transfer matrix formalism. The optical constants of the photoluminescent polymer, OxdEH-PPV, are obtained by measuring the interferometric fringe for the reference wavelength (633 nm) and then by applying the subtractive Kramers–Kronig transformation to the absorption spectrum and the reference refractive index. In order to attain the optical feedback as well as the PL excitation, we fabricated the aluminum and DFB mirrors. The DFB mirror was prepared by evaporating an alternating stack of quarter-wave TiO2 (nH) and SiO2 (nL) layers onto the glass plate.
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