Single-phase white light emitting phosphor Ba9Sc2Si6O24:Eu2+,Mn2+ has been successfully prepared by solid-state reaction. The energy transfer process from Eu2+ to Mn2+ has been demonstrated based on the excitation spectra, luminescent lifetime and low temperature spectra. Under ultraviolet light excitation, Eu2+ emits blue light (similar to 460 nm) and green light (similar to 512 nm), Mn2+ gets the energy transferred from Eu2+ and emits red light (similar to 615 nm). White light is obtained by tuning the concentration of Eu2+ and Mn2+. Those results suggest that Ba9Sc2Si6O24:Eu2+,Mn2+ can be a promising single phase phosphor for white light emitting diode (w-LED). (C) 2014 Elsevier Ltd. All rights reserved.