Luminescence of ZnS:Cu particles modified by shungite nanocarbon

Shungite Carbon Nanoparticles as Modifiers of Zns:Cu Phosphor, Based on Analysis of the EPR Spectral Lines of Mn⁺²

“…Interestingly, the dependence of the brightness of electroluminescence of the phosphors studied at a wavelength of 490 nm on the amount of ShC nanoparticles added behaves in the same manner (Fig. 5 in [7]). This effect was due to the presence of competing processes: a decrease in the brightness of luminescence due to the absorption of part of radiated light and an increase in brightness due to the concentration of the electrical field on phosphor particles [7].…”

“…5 in [7]). This effect was due to the presence of competing processes: a decrease in the brightness of luminescence due to the absorption of part of radiated light and an increase in brightness due to the concentration of the electrical field on phosphor particles [7]. Non-monotonic variations in the amplitude and width of a Mn +2 signal was repeatedly observed upon the plastic deformation [8] and thermal treatment [12] of phosphor powders due to the movement of partial dislocations upon minor deformations and the generation of strong electrical field upon major deformations.…”

“…The "green" band with a maximum at 490 nm was shown to be a donor-acceptor pair (Cu'Zn Cl*S). Donor-acceptor pairs, formed as copper ion associates in the node of zinc with a copper ion at the interstitial site of the crystalline lattice of ZnS:(Cu'Zn Cu • i), are responsible for a "blue" band with a maximum at 455 nm [7]. However, the manifestation of the blue and green bands in photoluminescence spectra is greatly dependent on the conditions of synthesis and industrial processing of the material such as changes in temperature regimes and plasticization of samples [8,9].…”

“…However, the manifestation of the blue and green bands in photoluminescence spectra is greatly dependent on the conditions of synthesis and industrial processing of the material such as changes in temperature regimes and plasticization of samples [8,9]. Furthermore, it has been shown [7] that the spectral-brightness characteristics of ZnSbased electroluminophors ZnS are largely dependent on the functional composition of their surface with a certain chemical composition and donor-acceptor (acid-basic) properties affecting electron transitions which can be modified using various methods. ShC nanoparticles were used as such a modifier in [7].…”

“…Furthermore, it has been shown [7] that the spectral-brightness characteristics of ZnSbased electroluminophors ZnS are largely dependent on the functional composition of their surface with a certain chemical composition and donor-acceptor (acid-basic) properties affecting electron transitions which can be modified using various methods. ShC nanoparticles were used as such a modifier in [7]. Nanocarbon was shown to be effectively fixed to the structural defects of phosphor.…”