Spectral tuning and energy transfer in a potential fluorescent lamp phosphor BaMg2Al6Si9O30:Eu2+

► BaMg2Al6Si9O30:Eu2+ phosphors are synthesized by the solid-state reaction method. ► PL intensity ratio of blue-ultraviolet emission increases with increasing Eu2+ contents. ► A redshift in the blue emission is observed with increasing Eu2+ contents. ► Energy transfer among Eu2+ ions is analyzed. ► They are promising phosphors for fluorescent lamps.