Solid state synthesis, structural and up-conversion properties of Yb³⁺∕Er³⁺ and Yb³⁺∕Tm³⁺∕Er³⁺ Doped La₂Ti₂O₇ phosphors

In this work, Yb³⁺∕Er³⁺ co-doped and Yb³⁺∕Tm³⁺∕Er³⁺ tri-doped La₂Ti₂O₇ phosphors were synthesized by solid-state reaction method. The phases of the powders were identified using the X-Ray Diffraction (XRD) technique. The purity of the La₂Ti₂O₇ phosphors were tested by energy dispersive spectroscopy (EDS). The photoluminescence properties of La₂Ti₂O₇ phosphors were investigated in the range of 400–850 nm wavelength under 975 nm laser excitation at room temperature. Presence of Tm³⁺ ion in the tri-doped powder effects the UC-emission processes observed in the powders co-doped with Yb³⁺∕Er³⁺.