P‐86: Effect of Mg on Properties of ZnS: Cu, Mn Phosphors

Abstract

Influence of the different concentration of Mg in ZnS powder precursor on properties of derived phosphors has been investigated. For this were synthesized ZnS:Cu,Mn phosphors co-doped with different amount of Mg, introduced with MgCl 2 ×6H 2 O. Comparison of properties shows that a small amount of Mg increases the brightness of the photo and electroluminescence. However, further increase in Mg content leads to a sharp decrease in brightness of the electroluminescence and a small shift of the spectrum to the shorter wavelengths.

Luminescence Property of ZnS:Mn,Mg Phosphor with Excitation of Plasma Blue Light Source

“…Also, small shifts to the shorter wavelengths in the spectral feature are seen with addition of magnesium contents. We consider this progressive shift to be affected by lowering of the band gap energy by Mg dopant, which is related to the formation of additional energy levels [12]. The photoluminescence spectra of magnesium-doped ZnS:Mn phosphors under 365 nm and 450 nm excitation wavelength are shown in Figures 6 (a) …”