A single-phase full-color phosphor based on Ba 3 MgSi 2 O 8 co-activated with Eu 2+ , Tb 3+ , and Mn 2+

Abstract

a b s t r a c tWe present a rapid and energy-efficient microwave-assisted approach to prepare a single-phase fullcolor phosphor based on Ba 3 MgSi 2 O 8 . The samples were prepared using a citric acid based solegel preparation pathway with a microwave-assisted heating step, which reduces the time required for the final heat treatment to less than 30 min. Thermogravimetric analysis was utilized to optimize the solution-based preparation prior to microwave heating. The structural properties of the obtained luminescent materials have been thoroughly investigated by means of X-ray powder diffraction and Rietveld analyses. To study the optical behavior, the excitation and emission spectra were recorded. Fullcolor emission is achieved using Eu 2þ (blue), Tb 3þ (green), and Mn 2þ (red) as the activator ions. The thermally robust emission was investigated using temperature-dependent luminescence spectroscopy. The energy-transfer processes within the samples were studied using time-dependent spectroscopy, and the quantum yield of this true color phosphor as a function of the composition was determined.

Crystal structure and monoclinic distortion of glaserite-type Ba3MnSi2O8

“…6 In the case of Ba3MnSi2O8, formation of Ba2SiO4 also results from minute oxidation of Mn +2 into Mn3O4, which was found in the sample at the 1. 4(1) wt% level.…”

“…1,2 . In particular, glaseritetype hexagonal Ba3MgSi2O8 shows very high tunability of emission which depends on the type of activation ion (Eu 2+ , Mn 2+ , Tb 3+ ) or mixture thereof 3,4 . The incorporation of Mn 2+ into the structure was assumed to occur on the Mg 2+ site due to its similar ionic radius; however, the end member Ba3MnSi2O8 was never investigated in detail.…”