Abstract
A series of Ca10Na(PO4)7:Ce3+/Tb3+/Mn2+ (CNPO:Ce3+/Tb3+/Mn2+) phosphors with high brightness were synthesized by high-temperature solid-state method. X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflectance spectra (DRS), photoluminescence (PL) spectra, luminescence decay curves and thermally stability were performed to characterize the as-prepared samples. For Ce3+-doped samples, an intense and broad band emission is present under 265 nm excitation. When Ce3+ and Tb3+ are codoped, energy transfer (ET) process from Ce3+ to Tb3+ is demonstrated with electric dipole–dipole interaction. The internal and external quantum efficiencies (QEs) of CNPO:0.15Ce3+, 0.04Tb3+, 0.005Mn2+ are measured to 76.79% and 54.11% under 265 nm excitation and temperature-dependent PL intensity can remain 51.78% at 150 °C of its initial intensity at 25 °C. It is indicated that single-phased white light-emitting CNPO:Ce3+/Tb3+/Mn2+ phosphor can serve as a promising phosphor for illumination devices.
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