Control of intensity of IR luminescence of hybrid associates of colloidal Ag₂S quantum dots with molecules of thiazine dyes

The controlling of intensity of IR luminescence (1000-1300 nm) of hybrid associates of colloid Ag₂S quantum dots (QD) (d = 2.5 nm) with molecules of thiazine dyes was determined. The control is manifested in the form of amplification or quenching of luminescence of QD in association. In the case of hybrid association of QDs with thionine molecules, the luminescence intensity in QD band (1000-1300 nm) repeatedly increases. And in the case of mixtures of QDs with methylene blue molecules, the luminescence intensity of QD is practically completely quenched. The observed effects are determined by the direction of transfer and the nature of the photophysical processes in these objects. These processes are determined by the location of HOMOLUMO levels of organic component with respect to the quantization levels of QDs. (authors)