Preparation and luminescence properties of Sr2EuxLa1−xAlO5 phosphor

The red emitting phosphor Sr2EuAlO5 was synthesized through the solid state reaction technique. The strong red emission of Eu3+ peaks around 590 nm and 620 nm was observed. The photoluminescence excitation spectra show a broad O2−-Eu3+ charge-transfer band in UV region and f-f transitions in near UV and visible region. By adding La3+ into the Sr2EuAlO5 phosphor, the red emission enhancement was observed. The luminescence lifetime and external quantum efficiency of these phosphors were measured. The Chromaticity Coordinates of Sr2Eu0.75La0.25AlO5 is x=0.64, y=0.36. The characteristic index shows that the red emission phosphor has high color saturation.