Luminescent properties of Sr2.5−3x/2Ba0.5SmxAlO4F oxyfluorides

Effective orange Sm3+-doped Sr2.5Ba0.5AlO4F phosphors excited at 254 and 408 nm excitation were prepared by the solid-state method. The excitation and emission spectra of Sr2.5−3x/2Ba0.5SmxAlO4F and Sr2.5−3x/2Ba0.5SmxAlO4−αF1−δ (x=0.001∼0.1) based on photoluminescence spectroscopy are investigated. The defects in anion-deficient Sr2.5−3x/2Ba0.5SmxAlO4−αF1−δ (x=0.001, 0.01) are monitored by broad-band photoluminescence emission centered near 480 nm along with the orange emission transitions of Sm3+. CIE values and relative luminescent intensities of Sr2.5−3x/2Ba0.5SmxAlO4F and Sr2.5−3x/2Ba0.5SmxAlO4−αF1−δ by changing the Sm3+ content (x=0.001∼0.1) are discussed.