Fluorescence Spectra and Optical Transition Properties of Eu3+-Doped Ca3NbGa3Si2O14 Phosphor

A detailed analysis of Eu3+-doped Ca3NbGa3Si2O14 phosphor prepared via the solid-state method is reported. Powder x-ray diffraction (PXRD) confirms the hexagonal system with space group P321 (150). Morphological study validates the morphology and composition of the synthesized phosphor. The photoluminescence (PL) emission spectra reveal a unique red emission at 615 nm, attributed to the D-5(0) -> F-7(2) transition. The optimized Eu3+ concentration is found to be 5.0 mol.%. The CIE chromaticity coordinates are found to be (0.58, 0.41). Higher values of Omega(4 )confirm the highly symmetric environment around the Eu3+ site, lower covalence, and higher ionicity of the Eu-O bond character. The observed quantum efficiency of 33% for the sample with optimized concentration indicates more efficient emission of photons upon excitation, opening up the possibility of its potential use in several optical devices.