In the present work, BaSrSiO4: Yb and CaSrSiO4: Yb (Yb = 0 mol %, 1 mol %, 2 mol % and 3 mol %) nanophosphors were synthesized using the co-precipitation method, and their comparative structural and optical properties were studied to demonstrate the effect of Yb ion on the characteristic properties of the prepared nanophosphors. The powder X-ray diffraction (PXRD) patterns of BaSrSiO4:Yb and CaSrSiO4:Yb suggest the formation of a single-phase orthorhombic structure with space groups Pbnm and Pna21, respectively. The Raman shifts in BaSrSiO4 (BSS) and CaSrSiO4 (CSS) indicate out-of-phase bending of Sr-O and symmetric stretching of Si-O. The FTIR spectra show bands in the spectra between 1033 and 1063 cm-1, which can be attributed to the vibration of the Si-O-Si bond in both samples. The result also supported the formation of orthosilicate. SEM revealed agglomerated chunks in the BSS samples and rod-like structures in the CSS samples. The PL spectra show a significant change in the intensity of the emission peak at 975 nm following the transition 2F7/2 → 2F5/2 for different alkali earth metals (Ca, Ba), which is related to the energy level and formation of Yb2+ ion in the respective hosts. In CaSrSiO4 doped Yb a red emitting band at 700 nm is observed which is not present in BaSrSiO4 host.
Keywords: Co-Precipitation; Nanophosphors; Orthorhombic Structure; Photoluminescence; Rare Earth.
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