Journal of the Ceramic Society of Japan
Online ISSN : 1348-6535
Print ISSN : 1882-0743
ISSN-L : 1348-6535
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Fluorescence properties of Srx(La9.2−xTb0.8)(SiO4)6Oα (x = 2–6) prepared by heat-treating mixtures of SrCO3, La2O3, SiO2, and Tb4O7
Susumu NAKAYAMA
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2021 Volume 129 Issue 4 Pages 223-225

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Abstract

In this study, phosphors based on Srx(La9.2−xTb0.8)(SiO4)6Oα (x = 2, 3, 4, 5, and 6) ceramic powders were prepared and their photoluminescence (PL) spectra were investigated. The phosphors show green emission at approximately 545 nm when excited by 378 nm UV light. X-ray photoelectron spectroscopy suggests that Tb in the Tb3+ and Tb4+ valence states coexist in phosphors at a Tb3+/Tb4+ atomic ratio of unity. [Sr2−x(La,Tb)x]SiOα was confirmed to exist in addition to Srx(La9.2−xTb0.8)(SiO4)6Oα at x = 4, 5, and 6. The PL intensity increased with increasing Sr(x) content, which is considered to be due increasing Srx(La9.2−xTb0.8)(SiO4)6Oα particle size. The strongest PL intensity was observed at x = 6, where the absorptivity, internal quantum efficiency, and external quantum efficiency were 20, 50, and 10 %, respectively.

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