Processes using exciton effect to reduce or increase fluorescence decay time, for frequency converters for fast optical communications systems, vary chromophore arrangement in multichromophore dyes to control electron transition moment

摘要

Process (A) using exciton effect in multichromophore dyes for reducing fluorescence decay time comprises arranging chromophores so that electron transition moments enclose angle greater than 90[deg] and/or are shifted by more than half length of molecule or even also twisted with respect to one another. Examples are perylene and xanthene dyes, rhodamines, e.g. rhodamine B or 6G, fluorescein, eosin, porphyrins, coumarins, diaminostilbenes, aminonaphthalimides and terrylene- and quaterrylene-bisimides as higher homologues of perylene dyes. Independent claims are included for the following: (1) process (B) using exciton effect of multichromophore dyes for increasing fluorescence decay time; (2) use of process (B) for delaying and forming optical impulses; (3) processes (C-H, J, K) using specified mono-, bi-, tri- or tetra-chromophore perylene dyes, terrylene dyes or quaterrylene dyes for converting short-wavelength light, e.g. blue light, to fluorescent light of longer wavelength, e.g. yellow light; (4) use of all these processes in optical communication systems; (5) use in optical communication systems with optical fibers; (6) use in digital data transfer.