Ce3+ and/or Eu2+ activated Ca2Mg0.5AlSi1.5O7 phosphors have been synthesized by high temperature solid state reaction. The luminescence of Ca2Mg0.5AlSi1.5O7:Ce3+, Eu2+ is studied as potential ultraviolet light-emitting diodes (UV-LEDs). There are two emissions peaked at 409 and 525 nm which come from d-f transitions of Ce3+ and Eu2+ ions. The energy transfer from the Ce3+ to Eu2+ has been discussed and it is demonstrated to be a resonant type via a dipole-dipole mechanism. The critical distance of Ce3+ to Eu2+ in Ca2Mg0.5AlSi1.5O7 has been calculated to be 26.71 angstrom by spectral overlap method. Furthermore, the Ca2Mg0.5AlSi1.5O7:Ce3+, Eu2+ phosphors can emit a tunable blue-to-green light under the excitation of 350 nm by appropriately tuning the relative proportion of Ce3+/Eu2+, indicating that the phosphors Ca2Mg0.5AlSi1.5O7:Ce3+, Eu2+ are promising blue-to-green emitting phosphors for application in pc-white LEDs. (C) 2014 Elsevier B.V. All rights reserved.