Sm3+ Activated Potassium Magnesium Pyrophosphate Nanophosphor: Synthesis, Structure, Optical and Luminescence Studies.

Abstract

K₂Mg_(1-x)P₂O₇Sm_x (x = 0.5-5 mol%) pyrophosphates were synthesized using a self-propagating solution combustion approach with the objective of generating luminous material for applications involving white light-emitting diodes. The structure formation of single-phase phosphor is validated, by the XRD and the presence of pyrophosphate (P₂O₇)^4- group is validated, by the FTIR. The HRTEM and XPS validates the morphological and electronic studies of the synthesized nanophosphor, respectively. The optical bandgap is determined by plotting the Tauc's plot using diffuse reflectance spectrum. In PL spectroscopy, at [Formula: see text]= 402 nm the Sm³⁺ doped K₂MgP₂O₇ nanophosphor shows a sharp emission peak at 603 nm, which corresponds to the transition ⁴G_5/2 → ⁶H_7/2 of Sm³⁺ ions. Furthermore, according to photometric investigations for optimum concentration, the color purity is 87%, the CCT is 1768 K, and the CIE coordinates are (x = 0.58, y = 0.42). The intact studies suggest that the phosphor is specially featured to emit in the amber region and have the potential to be used in the lamp industry, especially in solid-state lighting applications.