| Abstrakt: |
We investigated photoluminescence spectra of nanocrystals of ZnSxSe1-x:Mn solid solutions obtained by the method of self-propagating high-temperature synthesis. At room temperature, these nanocrystals luminesced in the visible area of spectrum for all values of the parameter x. Six individual bands were discovered in photoluminescence spectra of ZnSxSe1-x:Mn nanocrystals by the method of fourth-sixth derivative spectroscopy. For compounds with х =1, these bands are characterized by maxima of emission: λmax =639 nm (1), 616 nm (2), 600 nm (3), 580.5 nm (4), 555 nm (5), 530.5 nm (6), respectively. Probably, bands 1-5 are related to Mn2+ ions in different local environment. The maxima position of emission of 4-5 individual bands does not almost depend on x parameter value, maxima of 2-3 bands are monotonously displaced in a short-wave area with the increase of x parameter. Maximum of band emission 1 changes the hopping position in the range of x values: x =0.2÷0.4, which is related to hopping change of local environment of Mn2+ ions in MnS phase. To all appearance, 6 band's emission is not elementary, therefore its position of maximum of emission depending on the parameter value of x has hopping character [ABSTRACT FROM AUTHOR] |
