Tunable Emission Properties of CaTiSiO5:Ce3+, Mn2+ Phosphor via Efficient Energy Transfer

In this work, CaTiSiO 5 :Ce 3+ and CaTiSiO 5 :Ce 3+ , Mn 2+ phosphors are prepared in air via the high-temperature solid-state reaction method. The crystal structure, phase purity, and luminescence properties of the samples are investigated. CaTiSiO 5 :Ce 3+ phosphor under excitation at 320 nm emits mazarine light with chromaticity coordinates (0.1693, 0.0053) and optimal Ce 3+ doping concentration of ∼ 6 mol.%. CaTiSiO 5 :6%Ce 3+ , Mn 2+ phosphor with excitation at 320 nm shows a tunable color emission from yellow to red-orange with increasing Mn 2+ concentration from 1 mol.% to 8 mol.%, the corresponding chromaticity coordinates are changed from (0.4302, 0.4507) to (0.5475, 0.3916), and the corresponding lifetimes decrease from 34.22 ns to 16.33 ns. The energy transfer (ET) process between Ce 3+ and Mn 2+ ions is confirmed by the spectral properties and lifetimes of CaTiSiO 5 :6%Ce 3+ , Mn 2+ phosphor, with ET efficiency reaching ∼ 52.28%. The luminescence mechanism is explained by the energy level diagrams of Ce 3+ and Mn 2+ ions. The experimental results are of benefit for research and improving the tunable emission of other phosphors.