Ca8Mg(SiO4)4Cl2:Ce3+, Tb3+: A potential single-phased phosphor for white-light-emitting diodes

► The luminescence properties of Ca8Mg(SiO4)4Cl2:Ce3+, Tb3+ were investigated for the first time. ► The strong absorption of phosphors matches well with the emission band of UV LED chips. ► The energy transfer from Ce3+ to Tb3+ in Ca8Mg(SiO4)4Cl2 was investigated in detail. ► The white light (CIE=(0.29, 0.34)) is generated by tuning the relative ratio of Ce3+ to Tb3+.