Synthesis and Spectroscopic Investigations of Sm 3+ Activated ZrO 2 and Na 2 ZrO 3 as Warm Light Phosphors

In this work, we investigate how the structural and optical characteristics of ZrO and Na ZrO are influenced by Sm ion doping. Urea-assisted combustion approach is employed by varying the molar concentration of Sm ions in both the host lattices. XRD pattern revealed the monoclinic crystal system for both samples. XPS investigation has been examined to acquire the chemical information of the samples. FESEM is used to identify the morphology of the samples. The optimum molar concentrations of Sm doped ZrO and Na ZrO phosphors, as per photoluminescence (PL) findings, are 1.5 mol% and 2 mol%, respectively. CIE coordinates of ZrO :Sm and Na ZrO :Sm are found to be (x = 0.59, y = 0.41) and (x = 0.61, y = 0.39) that corresponds to the amber region of color gamut. The optical bandgap for the synthesized samples is estimated using the UV-Vis diffuse reflectance spectra and the obtained values for the optimal concentration of dopant (Sm ) in the ZrO and Na ZrO samples are 4.61 and 4.94 eV, respectively. The findings of the study reveal that the synthesized phosphors may be utilized as warm light phosphors and be a promising candidate for amber light-emitting diodes (LEDs).