LAUSR

Abstract A series of NaAlP2O7:xPr3+ (x = 1, 3, 5, 7, 9, 11, 13%) polycrystals have been prepared using the high temperature solid-state reaction method in air atmosphere. X-ray diffraction (XRD) measurements disclosed that all Pr3+ doped samples are single phase with the crystal structure of diphosphate NaAlP2O7 host. The fourier transform infrared (FT-IR) spectrum, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) spectrometry as well as photoluminescence excitation (PLE) and photoluminescence (PL) measurements were carried out at room temperature. NaAlP2O7:Pr3+ polycrystal exhibits a red emission with dominant peak at 663 nm under the visible blue light irradiation. The optimum dopant concentration of Pr3+ is 9%. The concentration quenching mechanism, CIE chromaticity coordinate and IQE were also present in this paper. This work reveals that NaAlP2O7:Pr3+ polycrystal is a potential red emitting phosphor for blue chips-excitated WLEDS.