Journal
POLYHEDRON
Volume 177, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2019.114322
Keywords
Double perovskite; Photoluminescence; Concentration quenching; Thermal quenching; Judd-Ofelt Paremeter
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Funding
- Advanced Research Center For Green Materials Science and Technology from The Featured Area Research Center Program by the Ministry of Education [107L9006]
- Ministry of Science and Technology in Taiwan [MOST 107-3017-F-002-001, MOST 107-2218-E-002-022]
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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.
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