LAUSR

Abstract A series of high phase purity blue light excitable yellow-emitting La 3− x Si 6 N 11 : x Ce 3+ phosphors were synthesized by the high temperature solid state reactions method. The structure and luminescent properties were investigated. The phase structure was studied by means of X-ray diffraction, structures refinements and energy dispersive X-ray spectroscopy. The phosphors effectively excited by the light of 450 nm and show intense yellow emission at 535 nm with FWHM of 115 nm corresponding to the 5d →  2 F 5/2 and 5d →  2 F 7/2 transitions of Ce 3+ . In addition, the optimized La 2.86 Si 6 N 11 :0.14Ce 3+ exhibits a weak thermal quenching, which remains 98.2% of the initial emission intensity when heated to 200 °C, the thermal quenching properties exhibit a modest decline when the temperature returned to room temperature. The above results indicate that La 3 Si 6 N 11 :Ce 3+ can be regarded as a high promising phosphor for applications in high power white-light LED.