A narrow-band green-emitting LaMgAl11O19:Ce3+, Mn2+ phosphor: Structure, energy transfer and luminescence

A narrow-band green-emitting LaMgAl 11 O 19 : Mn 2+ , Ce 3+ phosphor was synthesized through high-temperature solid-state reaction. The phase, luminescent properties, and energy transfer mechanism from Ce 3+ to Mn 2+ in LaMgAl 11 O 19 were systematically investigated. The results reveal that Ce 3+ ions serve as effective sensitizers for Mn 2+ in LaMgAl 11 O 19 , leading to enhanced green emission at 525 nm, upon 320 nm excitation. The energy transfer from Ce 3+ to Mn 2+ is found to occur via dipole-dipole interactions, with a calculated critical transfer distance of 14.24 Å. The quantum efficiency of the optimized sample reaches 74.3 %, and the phosphor exhibits excellent thermal stability, retaining 92 % of its luminescence intensity at 150 °C. These results indicate the LaMgAl 11 O 19 : Mn 2+ , Ce 3+ phosphors exhibit high potential for wide color gamut white light-emitting diode (wLED) backlighting applications. • Narrow-band green-emitting LMAO:Ce 3+ , Mn 2+ phosphor was synthesized. • The influence of Ce 3+ on the structure and luminescent properties of LMAO:Mn 2+ phosphor was investigated. • Excellent quantum efficiency and thermal stability were achieved, with 92 % of the luminescent intensity maintained at 150 °C. • The energy transfer between Ce 3+ and Mn 2+ ions was studied. • Valuable insights into improving the luminescent performance of Mn 2+ -doped phosphor materials.