New sensitizing roles of defect-induced self-activator in Sr2.5−3/2Ca0.5Pr Al1−In O4F (0.001 ⩽x⩽ 0.05 y= 0, 0.1) Phosphors

Abstract Luminescent materials composed of Sr 2.5−3 x /2 Ca 0.5 Pr x Al 1− y In y O 4 F (0.001 ⩽ x ⩽ 0.05 y = 0, 0.1) were prepared by solid-state reaction. The dependence of the luminescent intensity of Pr 3+ -doped oxyfluorides on the Pr 3+ content ( x = 0.001–0.05) is also discussed. The photoluminescence (PL) properties of Pr 3+ -doped in both Sr 2.5 Ca 0.5 Al 1− y In y O 4 F and Sr 2.5 Ca 0.5 Al 1− y In y O 4− α F 1− δ oxyfluorides were scrutinized. Replacement of Al 3+ by In 3+ in the Pr 3+ -doped host structure sensitized the material and enabled a novel and high-energy charge-transfer. The desired CIE values with emission through the red, orange, yellow, and blue–green regions of the spectra in the oxyfluorides were achieved. The effective sensitization using the defect-induced self-activating oxyfluoride phosphors will be useful in applications related to NUV-LEDs.