Energy transfer from Eu2+ to Mn2+ in MgS:Eu2+, Mn2+

Photoluminescence and excitation spectra are observed for MgS:EuF3 (0.01 mol%) and MgS:EuF3 (0-0.05 mol%), MnF2 (1 mol%) powder phosphors at 10, 80 and 300 K. At 300 K, the emission spectra of the doubly activated phosphors of MgS:Eu2+, Mn2+ consist of three bands at 592 nm (attributed to Eu2+), 700 nm (attributed to Mn2+) and 820 nm. Their shapes depend on the Eu2+ concentration and the excitation wavelength. We can see direct evidence of the energy transfer from Eu2+ to Mn2+ in the emission and excitation spectra of MgS:Eu2+, Mn2+. The new emission band observed at 820 nm is attributed to the center associated with both Eu2+ and Mn2+, e.g. the paired-ion center of the Eu2+ and Mn2+ ions.