Synthesis, crystal structure, and luminescence properties of a novel green emitting phosphor Na2Mg1-xSiO4:Mnx2+

Abstract In this paper, a novel green phosphor Na 2 Mg 1-x SiO 4 :xMn 2+ (x = 0.02, 0.04, 0.06, 0.08, 0.10, 0.12, 0.15, 0.20) was successfully synthesized by a traditional solid-state reaction method at 950 °C. The powder X-ray diffraction (PXRD), the photoluminescence excitation and emission spectra (PL and PLE) were measured to systematically study the as-prepared phosphors. The as-obtained Na 2 MgSiO 4 :Mn 2+ phosphor shows an intense asymmetric green emission spectra with the broad-band peak at 520 nm due to 4 T 1 ( 4 G) → 6 A 1 ( 6 S) transition of the Mn 2+ ion. The optimum Mn 2+ concentration in this phosphor was 8 mol%. The Mn Mn critical distance was calculated to be 13.42 A. The dipole–dipole interaction dominates in the non-radiative energy transfer between the Mn 2+ ions and causes the concentration quenching. The decay curve of the Na 2 MgSiO 4 :Mn 2+ phosphors were discussed. The CIE chromaticity coordinate values (x = 0.163, y = 0.631) of Na 2 MgSiO 4 :0.08Mn 2+ phosphor were located in green region and the correlated color temperature was 8643 K. The above results indicate that Na 2 MgSiO 4 : Mn 2+ as a green component can be a good candidate for near UV-excited w-LEDs.