Tuning the size and shape of zeolite L-based inorganic-organic host-guest composites for optical antenna systems

Fine tuning of the size of zeolite L crystals in a large range is possible by changing the composition of the starting gel for otherwise constant reac tion conditions. We describe a convenient way to prepare different crystall ine materials in the size range of 30 nm up to 3000 nm. Representative data on the morphology, the pore volume, the size distribution and the optic I al antenna system behavior for light harvesting and transport are reported. We have extended the investigations on energy migration in pyronine-loaded zeolite L crystals as donor molecules, modified with oxonine as luminescen t acceptors (traps) at the crystal ends. The preparation procedure reported and the extended zeolite materials now available lead to a large improveme nt of the energy migration efficiency.