Photofluorochromic spirocompounds and their application

Our previous data on photochromic spirocompounds and chromenes that exhibit photoinduced fluorescence are autoreviewed. The best photoinduced fluoresc ent characteristics were found for nitro-substituted indoline spiropyrans a nd diphenylnapthopyrans. The phenomenon of photoinduced fluorescence can be used in two-photon recording media for three-dimensional bitwise working o ptical memory as well as for conversion of UV irradiation into visible ligh t in thin layers.