Dyestuff Lasers and Light Collectors — Two New Fields of Application for Fluorescent Heterocyclic Compounds

The physical principles and methods of the functioning of fluorescent solar collectors and dyestuff lasers are briefly discussed, together with the demands that have to be met by a fluorescent dyestuff.In a summary of recent work carried oui in these two fields, a report is given of perylene carboxylic ester dyes and perylene tetracarboxylic acid diimide dyes for solar collectors, bifluorophoric laser dyes, laser dyes with intramolecular triplet quenching and infrared laser dyes with pyrylium and thiapyrylium terminal systems, also from the tetra and hexamethine hemicyanine ranges.