Mn4+ doped Li2MgTi3O8 non-rare-earth red phosphor were discussed theoretically and experimentally. Ab initio calculation of density of states (DOS) based on density function theory (DFT) were conducted first to predict the effect of doping Mn4+ and sensitizers (Ge4+ and Co2+). The overlapped states indicated that Ge4+ and Co2+ could be the sensitizers to enhance the emission intensity. Then the phosphor was synthesized by conventional solid-state reaction. The effects of calcination temperature and Mn4+ doping concentration were investigated to determine the optimal preparation conditions. Through the analysis of XRD and PL, it can be found that the crystallinity plays an important role in the luminescent intensity. In addition, the emission intensity increases 55% and 316% after doping of Ge4+ and Co2+, respectively. The red-shift of emission peak in Co2+-doped PL spectrum is ascribed to the band-narrowing, which is confirmed by the results of UV–vis. In this work, the DOS calculation is all proved by the experimental results.
All Science Journal Classification (ASJC) codes
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry