LIGHT-EMITTING CONJUGATED POLYMERS IN OPTICAL MICROCAVITIES

We studied the luminescence of microcavities consisting of a single-la yer of poly(para-phenylenevinylene), PPV, sandwiched between a dielect ric mirror coated with a conducting indium-tin oxide layer and a semi- transparent metal electrode. Compared with a device without cavity str ucture, the emission is spectrally and spatially narrowed, and the for ward emission intensity enhanced. The Full Width at Half Maximum of th e modes is about 4 nm in photoluminescence and we measure an enhanceme nt of intensity in the forward direction of more than an order of magn itude. The PL efficiencies and lifetimes on a sub-ns time scale show o nly minor alterations with respect to PPV on glass.