fig3

Figure 3. (A) The emission and excitation spectra of ZnS:Ag(2%) phosphors. The emission spectra are monitored by different excitation wavelengths; (B) The emission and excitation spectra of ZnS:Ag phosphors at different Ag⁺ doping concentrations (λ_ex = 340 nm, λ_em = 450 nm). The inset is a plot of the ZnS:Ag emission intensities as a function of Ag⁺ doping concentrations.