MULTICOLORED CHROMOPHORE FOR WHITE-LIGHT-EMITTING DIODES

Light-emitting diodes that emit white light require active materials t hat are able to emit throughout the entire visible spectrum. A simple approach is reported here, based on host-guest systems in which the gu est is a single chromophore and the host a polymer blend. It is demons trated that the emission of the chromophore may depend strongly on the choice of the matrix polymer. The absorption, photoluminescence, and electroluminescence spectra of the chromophore PSA in matrices of poly norbornene, Durel (a polyarylate), polyvinylpyridine, and blends are p resented.