Color-Tunable, Single Phased MgY₄Si₃O₁₃: Ce³⁺, Mn²⁺Phosphors with Efficient Energy Transfer for White-Light-Emitting Diodes

A series of Ce 3+ /Mn 2+ -coactivated MgY 4 Si 3 O 13 phosphors with oxyapatite nature have been prepared via high temperature solid state reaction process and their structural and luminescence property was thoroughly investigated. On examining the Mn 2+ concentration-dependent photoluminescence properties, we found that the increment of Mn 2+ concentration would lead to a systematic decrease of Ce 3+ emission due to the efficient energy transfer from Ce 3+ to Mn 2+ , which occurs because of the spectral overlap between the emission band of Ce 3+ and the excitation band of Mn 2+ . The resonant energy transfer from Ce 3+ to Mn 2+ via a dipole-quadrupole mechanism was supported by decay lifetime data and the critical distance (R C ) of the energy transfer was calculated to be 14.13 Å. The color-tunable emission in Ce 3+ /Mn 2+ codoped system as a function of Mn 2+ concentration can be realized by continuous shifting of the emission colors from blue to white and eventually to orange red region. Based on the results in this study, MgY 4 Si 3 O 13 :Ce 3+ ,Mn 2+ phosphors are considered efficient phosphors with excellent color tunability for white UV-LEDs.