Blue emission of Eu²⁺ doped LaMgAl₁₁O₁₉ phosphor prepared by combustion synthesis method

Blue-emitting phosphor LaMgAl₁₁O₁₉:Eu²⁺ has been synthesized successfully at 500 °C by one step combustion synthesis method. The as-synthesized materials were characterized by powder x-ray diffraction (XRD) and photoluminescence (PL) techniques. Upon 365 nm excitation, emission spectra of the LaMgAl₁₁O₁₉:Eu²⁺ phosphors show a blue band at 450 nm. The excitation spectra corresponding to 4f⁷-4f⁶5d transition of Eu²⁺ cover the spectral range of 280–430 nm. The concentration quenching of Eu²⁺ in the LaMgAl₁₁O₁₉ host was determined to be 3 mol%. The CIE chromaticity of LAM: Eu²⁺ phosphors was compared with the commercial BAM.