Synthesis, spectroscopic characterization and estimation of Judd-Ofelt parameters for Dy3+ activated Li2MgZrO4 double perovskite materials

A series of Dy3+ doped Li2MgZrO4 phosphors were synthesized via solid-state reaction route. Crystal structure and phase purity were studied via X-ray diffraction and PDXL software. Obtained results revealed that the synthesized phosphors were of single-phased double perovskite structure in a tetragonal geometry with a space group of I41/amd (141). Obtained photoluminescence emission spectra affirmed the existence of blue (493 nm) and yellow emission (582 nm) with a weak red emission at about 670 nm owing to characteristics F-4(9/2)- H-6(J/2) transitions of Dy3+. Photoluminescence emission spectra were recorded with elevation of Dy3+ concentration ranging from 2 mol% to 7 mol% and concentration quenching was observed at 5 mol% Dy3+ concentration. In addition, temperature dependent photoluminescence (PL) properties were studied in between 300 K and 470 K. The calculated thermal quenching activation energy was 0.224 eV, avowed good thermal stability of synthesized phosphors. PL excitation spectra were utilized to evaluate Judd-Ofelt intensity parameters. The obtained spectral parameters implied the suitability of the present phosphors as competent luminescent materials for light emitting devices. (C) 2019 Elsevier Ltd. All rights reserved.