Synthesis, photoluminescence, and up-conversion luminescence of niobates co-doped with Er3+ and Yb3

Niobates, CaNb2O6 with columbite-type structure doped with Er3+ (CaNb2O6:Er3+) and co-doped with Er3+ and Yb3+ (CaNb2O6:Er3+/Yb3+) were synthesized from precursor solutions using inorganic salts under mild hydrothermal conditions at 240 °C. The as-prepared niobates appeared to be a sheaf of aligned...

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Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2020/11/01, Vol.128(11), pp.866-874
Main Authors: HIRANO, Masanori, IWATA, Hiroyuki, TANAKA, Kouki
Format: Article
Language:English
Subjects:
CaNb2O6
Columbite
Emission analysis
Er3
Erbium
Heating
Hydrothermal synthesis
Inorganic salts
Niobates
Photoluminescence
Up-conversion
Upconversion
Yb3
Ytterbium
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Summary:Niobates, CaNb2O6 with columbite-type structure doped with Er3+ (CaNb2O6:Er3+) and co-doped with Er3+ and Yb3+ (CaNb2O6:Er3+/Yb3+) were synthesized from precursor solutions using inorganic salts under mild hydrothermal conditions at 240 °C. The as-prepared niobates appeared to be a sheaf of aligned acicular particles. At 3 mol % Er3+, the as-prepared CaNb2O6:Er3+ showed the strongest photoluminescence (PL) in the characteristic green spectral region corresponding to the 2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 transitions of Er3+. The green PL intensity of the sample doped with 5 mol % Er3+ after heating at 1300 °C in air was more than 10 times stronger than that before heating when exciting directly at 377 nm. The effect of the concentration of the sensitizer Yb3+ on the up-conversion emission of CaNb2O6:Er3+/Yb3+ was investigated using samples after heating in air. The up-conversion emission intensity of CaNb2O6:Er3+/Yb3+ became the maximum at 5 mol % Er3+ and 20 mol % Yb3+ under excitation at 980 nm.
ISSN:1882-0743
1348-6535
DOI:10.2109/jcersj2.20058