Y$_2$O$_3$:D{y}$^{3+}$/L{i}$^{+}$ phosphors synthesized by spray

Abstract

Dysprosium and Lithium-activated yttrium oxide phosphor was synthesized at 1100 $^\circ$C by ultrasonic spray pyrolysis (USP) using DI water as solvent and metal chlorides as precursors. The characteristic emission peaks of Dy$^{3+}$ due to the transitions $^4$F$_{9/2}$ to $^6$H$_{15/2}$ at 483 nm, $^4$F$_{9/2}$ to $^6$H$_{13/2}$ at 573 nm, $^4$F$_{9/2}$ to $^6$H$_{11/2}$; at 667 nm and $^4$F$_{9/2}$ to $^6$H$_{9/2}$ at 766 nm were observed. Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) measurements were carried out to understand surface morphological features and the particle size of the phosphor. The uniformity of phase of Dy$^{3+}$ $_-$Li$^+$ doped Y$_2$O$_3$ phosphors was checked by X-ray diffraction (XRD) technique. The phosphors form clusters that were found to be $\sim 1$ $\mu$m in size, however, particles that form these clusters have sizes between 40 and 120~nm.