Synthesis and photoluminescence in LiTi₂ (PO₄)₃:Eu3+, Tb3+ phosphor prepared by solid state metathesis.

A series of singly and co-doped LiTi2(PO 4 ) 3 :Eu 3 + , Tb 3 + phosphors prepared by solid state metathesis (SSM) was reported the first time. The X-Ray diffraction (XRD) verified that the as-prepared materials exhibit a pure rhombohedral phase with a space group of P21/m. Scanning electron microscopy (SEM), Energy Dispersive X-ray analysis (EDAX) and elemental mapping confirm the morphology and constituents of elements. The LiTi2(PO 4 ) 3 :Eu 3 + shows 614 nm red emission obtained due to the 5D 0 → 7 L6 transition under 393 nm excitation and the Tb 3 + doped sample gives 546 nm green emission ascribed to 5D 4 → 7 F5 for excitation of 376 nm. The luminescence properties of Eu 3 + /Tb 3 + doped LiTi2(PO 4 ) 3 phosphors excited under a UV source were investigated and the relative mechanism was analyzed. Upon excitation by 393 nm, the LiTi2(PO 4 ) 3 :EuxTby phosphor has the capability to generate vivid green, yellow and red emissions, with color tunability achieved through the modulation of dopant ion concentrations. Color chromaticity of LiTi2(PO 4 ) 3 :Eu 0. 0 1 Tb 0. 0 5 gives at x = 0. 5 7 4 , y = 0. 4 2 5 and CCT = 1 8 1 0. 0 4 K. The proposed simple, low-cost, nontoxic and rapid synthesis route of phosphate-based compounds will lead the way to access these LiTi2(PO 4 ) 3 :Eu 3 + /Tb 3 + phosphors for potential applications in w-light-emitting diodes and plasma display panel. [ABSTRACT FROM AUTHOR]