INVESTIGATION OF PHOTOLUMINESCENCE OF ZnSxSe1-x AND ZnSxSe1-x:Mn NANOCRYSTALS OBTAINED BY COMBUSTION SYNTHESIS FOR OPTOELECTRIC DEVICES

Abstract

The photoluminescence spectra of ZnSxSe1-x and ZnSxSe1-x : Mn nanocrystals obtained by combustion synthesis for all compositions with the parameter step x = 0.2 were registered. The movement of the maximum of the integral photoluminescence spectrum in ZnSxSe1-x and ZnSxSe1-x : Mn nanocrystals towards higher energies, depending on the parameter x, was noted. It was noticed that in the range of values x = 0.2÷0.4 there is an abrupt change in the half-width of the integral photoluminescence spectrum in ZnSxSe1-x and ZnSxSe1-x : Mn nanocrystals and the signal intensity; this may be due to the crystal lattice transformation. The parameters of the individual photoluminescence spectra of ZnSxSe1-x : Mn nanocrystals were determined by one experimental measurement based on the Tikhonov method and the derivative spectroscopy method. The nature of the individual photoluminescence bands is discussed. The difference between the integral (sum of individual bands) and experimental spectrum arises from the presence of an additional individual band of low intensity in the experimental spectrum. This individual band is located in the region of E = 2.48 eV and is associated with the electronic transitions in Mn2+ ions in the ZnS lattice.