Retrospection of polymer capped LaPO4: Eu3+ luminescent nano phosphor for ingenious solid state lighting

Abstract

In the present work, the optical properties of LaPO4:Eu3+ luminescent nano phosphors passivated with different capping agents have been probed in depth. Nano particles of Lanthanum orthophosphate nano phosphor were successfully synthesized employing wet chemical synthesis route. The structural properties were investigated through XRD, SEM and, TEM whereas the optical properties were explored using photo luminescent characterizations along with afterglow studies. The PL emission intensity peaks were observed at 588nm, 593 nm, 613 nm and 621 nm corresponding to 5D0-7F1 and 5D0-7F2 spectroscopic transitions and are supposed to emit orange-red energy spectrum. With the help of diffuse reflectance spectroscopy, the optical band gaps of differently capped phosphors were calculated employing Kubelka Munk equations.