Blue–white–orange tunable luminescence from Ca6La2Na2(PO4)6F2:Eu2+, Mn2+ phosphors excited by UV light

New Eu2+ and/or Mn2+ activated Ca6La2Na2(PO4)6F2 phosphors were prepared and their photoluminescence properties upon ultraviolet excitation were investigated. Phosphor Ca6La2Na2(PO4)6F2:Eu2+,Mn2+ shows a broad blue emission band and an orange emission band, which originates from Eu2+ and Mn2+, respectively. The resonant type energy transfer from Eu2+ to Mn2+ was demonstrated, and the energy transfer efficiency was also calculated according to their PL decay curves. Tuning of the content of Mn2+ can generate the varied hues from blue to white and eventually to orange. Our results demonstrate that the phosphor is promising for producing UV-LED-based white LEDs.