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Luminescence properties of Eu 3+ ‐ and Tb 3+ ‐doped δ ‐Bi 2 O 3 stabilized by Th 4+ substitution
Author(s) -
Sethi Aanchal,
Pandey Jyoti,
Uma Sitharaman,
Nagarajan Rajamani
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16768
Subject(s) - fluorite , luminescence , doping , photoluminescence , analytical chemistry (journal) , materials science , dopant , raman spectroscopy , bismuth , crystallography , chemistry , physics , optics , optoelectronics , chromatography , metallurgy
The extent of incorporating Eu 3+ and Tb 3+ for bismuth in the oxygen‐deficient fluorite structured Bi 0.50 Th 0.50 O y has been examined together with the comprehension of their luminescence characteristics. The samples were synthesized by solution combustion method from which doping limits of Eu 3+ and Tb 3+ , respectively, in the fluorite structure was determined. Uniform distribution of constituent elements was confirmed from elemental mapping. Doping Eu 3+ and Tb 3+ ‐ions introduced compressive strain and oxygen vacancies in the system. Raman spectra of doped samples confirmed the fluorite structure and revealed the existence of oxygen vacancies in them. While Tb‐doped samples showed a systematic decrease in band gap with increase in dopant concentration, such systematic variation was not observed for Eu‐doped samples. Conclusions about the local site symmetry around Eu 3+ and Tb 3+ ions in the defect fluorite structure have been drawn from the photoluminescent spectral analysis of doped samples. Energy transfer from Bi 3+ to Eu 3+ and Tb 3+ ‐has been observed in these samples. The Judd‐Ofelt analysis has been carried out to understand luminescence characteristics in these samples.