Microwave-assisted synthesis of Eu3+ doped lanthanum orthoborates, their characterizations and luminescent properties

LaBO3 with various particle sizes have been successfully prepared by microwave-assisted combustion and sol–gel synthesis methods. Urea, citric acid and glycine have been used as fuels during the synthesis process. Characterizations were done by X-ray diffraction (XRD), Fourier Transform Infrared (FTIR) Spectroscopy, Photoluminescence Excitation and Emission Spectroscopies, Scanning Electron Microscopy (SEM), and Transmission Electron Microscopy (TEM). The SEM micrographs show dissimilar morphologies of powders with different particle sizes. Luminescent properties of 2.5%, 5.0%, and 7.5% Eu doped LaBO3 synthesized with three different fuels were compared. The results showed that a 5% level is the critical doping amount for all, and the one synthesized with urea gives rise to the stronger emissions compared to others.

Luminescence spectra of Eu3+ doped LaBO3 by a) citric acid b) glycine c) urea precursors at 395 nm excitation. Green lines refer to 5%, blue lines refer to 7.5%, and red lines refer to 2.5% mole of Eu.Figure optionsDownload as PowerPoint slide