Влияние полимерной матрицы на люминесцентные свойства композиций, допированных хелатами бора

Polymer luminescent compositions based on polystyrene (PS), polycarbonate (PC) and polymethyl methacrylate (PMMA) doped with boron difluoride dibenzoylmethanate (DBMBF2), boron difluoride anthracenoylacetonate (AntAcBF2) and their mixture were investigated. Composition based on PS has a maximum quantum yield of luminescence. The role of PS in increasing the efficiency of energy transfer from the donor (DBMBF2) to the acceptor (AntAcBF2) is revealed, which is due to the formation of exciplexes between DBMBF2 and phenyl rings of PS.

Quantitative express estimation of humine and fulvo acids content in aqueous solutions by photo-stimulated luminescence

The work substantiates the expediency of using the methods of recording the quantum yield of luminescence of humic and folic compounds in the process of determining the relative concentrations of these substances in aqueous and colloidal solutions. The efficiency of using modern high-power ultraviolet semiconductor light sources with high monochromaticity of light flux has been proved, followed by the registration of reviews of the samples under investigation with the help of a low-noise semiconductor photodetector with a connected operational amplifier, which allows to provide a wide dynamic range of current and voltage measurements. The subject of the study is the process of recording the quantitative and qualitative parameters of the se- lected chemical compounds in colloidal systems in the liquid phase developed in the course of research by the model of the measuring instrument. The novelty of the work is to improve the classical methods for recording the quantum yield of lumines- cence, using a modern element base and testing the model of a measuring device with powerful ultraviolet light-emitting diodes as a light source and low-noise photodetector with a clear dynamic range designed for recording the quantum yield of luminescence of the samples under investigation.