Luminescence Tuning of Sr 8 MgCe(PO 4 ) 7 :Eu 2+ ,Mn 2+ Phosphors: Structure Refinement, Site Occupancy, and Energy Transfer

Sr 8 MgCe(PO 4 ) 7 :Eu 2+ ,Mn 2+ phosphor with whitlockite‐type structure was prepared by a combustion‐assisted solid‐state reaction. The crystal structure and luminescence properties were investigated. Under UV radiation, Sr 8 MgCe(PO 4 ) 7 host exhibits a violet‐blue emission band from Ce 3+ ions. When Eu 2+ /Mn 2+ are doped into the host, the samples excited with 270 nm UV radiation present multicolor emissions due to the energy transfer (ET) from Ce 3+ to Eu 2+ /Mn 2+ . The emitting color of Sr 8 MgCe(PO 4 ) 7 :Eu 2+ can be tuned from violet‐blue to yellow‐green, whereas Sr 8 MgCe(PO 4 ) 7 :Mn 2+ can emit red light. Under excitation with long wavelength at 360 nm, Sr 8 MgCe(PO 4 ) 7 :Eu 2+ phosphor shows a broadband emission from 390 to 700 nm, which is attributed to the 4f 6 5d 1 →4f 7 transition of Eu 2+ without the contribution from Ce 3+ emission. Tunable full‐color emitting light can be achieved in the Eu 2+ and Mn 2+ ‐codoped Sr 8 MgCe(PO 4 ) 7 phosphor by ET Eu–Mn through control of the levels of doped Eu 2+ and Mn 2+ ions. These results suggest that Sr 8 MgCe(PO 4 ) 7 :Eu 2+ ,Mn 2+ phosphor has potential applications in NUV chip pumped white LEDs.