EPR and optical study of Mn2+ doped BaCO3 for potential yellow laser application

Undoped and Mn2+ doped BaCO3, were synthesized using the autocombustion method. The powders obtained by autocombustion were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, scanning electron microscopy (SEM), electron paramagnetic resonance (EPR), and photoluminescence (PL). The orthorhombic phase is obtained just after autocombustion without additional heat treatment. The Crystallite size changes from (64.1 to 70.5 nm) and (41.7 to 44.9 nm) for undoped and Mn2+ doped BaCO3. The FTIR and Raman spectra show the characteristic vibration modes of BaCO3. Morphological analysis shows that the synthesized powders consist of spherical and agglomerated particles. The EPR measurements show for doped sample the appearance of the characteristic broad signal of Mn2+ ions, in addition to the narrow response of BaCO3 with g = 2.0025, which shows the incorporation of Mn2+ ions in the matrix. The estimated optical deviation values, obtained by extrapolating the linear portion of the curve for the undoped and Mn2+ doped BaCO3 samples, are 3.22 eV and 3.28 eV, respectively. Photoluminescence showed that the sample had intense yellow emission at 567 nm (4T1 → 6A1) when excited at a wavelength of 366 nm. The typical CCT value of Mn2+ doped BaCO3 was estimated to be around 4070 K. The CIE coordinates of the sample are (x = 0.421, y = 0.556) with a purity of 94%, which makes it a potential candidate for laser emission. © 2024 Elsevier GmbH