ELECTRONIC PROCESSES OF CONJUGATED POLYMERS IN SEMICONDUCTOR-DEVICE STRUCTURES

We report progress in the processing and application of poly(phenylene vinylene), PPV, as the emissive layer in electroluminescent diodes, L EDs. Photoluminescence efficiencies above 60% for solid films of PPV a re now achieved, and single-layer EL diodes achieve luminous efficienc ies above 2 Lumens/W arid peak brightnesses up to 90,000 cd/m(2). We d emonstrate that PPV of this type can show stimulated emission in sub-p icosecond pump-probe experiments, and can be used as the active lasing medium when incorporated in suitable microcavity structures.