S. S. Anufrik,* V. V. Tarkovskii, and V. M. Nikitchenko
 

                                                                                                UDC 621.375.8

The effect of heterocycles of different types on the fluorescence and generation properties of ten new bifluorophores is investigated experimentally. It is shown that a number of 7-diethylaminocoumarins with a triazole cycle or an oxydiazole cycle are characterized by the highest generation efficiency in the region of 500-515 nm. The maximum generation energy was 2.5 J in lamp pumping, which exceeds widely known coumarin 334 in efficiency by a factor of 1.7. Stabilization of the coumarin fragment by the nucleus of julolidine — 7-N(CH₂)₆ — has a favorable effect on the photostability of these molecules. The effect and the role of the isomer form of the thiazole fragment on the spectral and generation properties of the molecule are established. A favorable effect on the generation efficiency of the imino group in the coumarin fragment of the molecule is shown.