Optical properties of LnPO4:Tb3+ (Ln = Y, La and Gd) powder phosphors

The synthesis and fluorescence properties of Tb3+-doped YPO4, LaPO4, GdPO4, (La,Gd)PO4, (La,Y)PO4 and (Gd,Y)PO4 powder phosphors are reported. Under UV-source these phosphors have been fluorescing in green color due to the emission transition (5D4→7F5). FT-IR absorption spectra of such samples were recorded. Scanning electron microscopy investigations were carried out to understand the surface morphological features and the grain size. The room-temperature lifetime measurements were made for the different emission transitions of these powder phosphors. X-ray energy dispersive analysis (EDAX) was also performed.