New sensitizing roles of defect-induced self-activator in Sr2.5−3x/2Ca0.5PrxAl1−yInyO4F (0.001 ⩽ x ⩽ 0.05 y = 0, 0.1) Phosphors

Luminescent materials composed of Sr2.5−3x/2Ca0.5PrxAl1−yInyO4F (0.001 ⩽ x ⩽ 0.05 y = 0, 0.1) were prepared by solid-state reaction. The dependence of the luminescent intensity of Pr3+-doped oxyfluorides on the Pr3+ content (x = 0.001–0.05) is also discussed. The photoluminescence (PL) properties of Pr3+-doped in both Sr2.5Ca0.5Al1−yInyO4F and Sr2.5Ca0.5Al1−yInyO4−αF1−δ oxyfluorides were scrutinized. Replacement of Al3+ by In3+ in the Pr3+-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.

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► The luminescent properties of Pr3+-doped oxyfluoride phosphors are investigated.
► The novel charge-transfer band in the phosphors is effectively sensitized with high energy transfer.
► Both of the activating and sensitizing behaviors can be combined in one material.
► The substitution of Pr3+ content in the oxyfluoride hosts is amenable to change CIE values.