Synthesis and Photoluminescence of a Novel Green‐Emitting La 5 Si 3 O 12 N : Eu 2+ Phosphor

A novel green‐emitting La 5 Si 3 O 12 N : Eu 2+ phosphor has been synthesized with the solid‐state reaction method under the high temperature, high pressure, and reducing atmosphere. This phosphor shows stable Eu 2+ photoluminescence spectra. No Eu 3+ line spectra have been found. For the emission band, an abnormal blue shift has been found. Concentration quenching occurs at Eu 2+ concentration of 4 mol%. The photoluminescence property at high temperature was investigated. The physical mechanisms for blue shift, concentration quenching and thermal quenching were investigated and discussed. The proposed synthesis process could be a suitable method to acquire the stable Eu 2+ photoluminescence in the trivalent metal cation compounds.