Correlation between emission properties, valence states of Ce and chemical compositions of alkaline earth borate glasses

Correlation between emission properties, valence states of Ce and chemical compositions of... Although there are many reports investigating emission properties of Ce3+ centers, there is little report on the quantitative Ce3+/(Ce3++Ce4+) ratio, which is one of the most fundamental factors for designing phosphors. In this report, we have investigated the correlation among the optical and emission properties of Ce-doped alkaline earth borate glasses with the Ce3+/(Ce3++Ce4+) ratio determined by X-ray absorption near-edge structure analyses. It is confirmed that the additional carbon increases the population of Ce3+, which is also suggested from the optical absorption edge, Eg opt, due to Ce and the quantum yield (QY). We have revealed that the Ce3+ concentration of the Sr-substituted glass is completely the same as that of the Ca-substituted one that exhibits the highest efficiency, even though the Ce3+ ratio is suggested to depend on the substitution spices from the Eg opt and QY. Therefore, we can conclude that not only the Ce3+ amount but also the local structures of Ce3+ affect the emission properties. In other words, the luminescent efficiency of the Ce3+ centers in amorphous materials strongly depends on the various local coordination states. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Luminescence Elsevier

Correlation between emission properties, valence states of Ce and chemical compositions of alkaline earth borate glasses

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Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier B.V.
ISSN
0022-2313
eISSN
1872-7883
D.O.I.
10.1016/j.jlumin.2017.12.068
Publisher site
See Article on Publisher Site

Abstract

Although there are many reports investigating emission properties of Ce3+ centers, there is little report on the quantitative Ce3+/(Ce3++Ce4+) ratio, which is one of the most fundamental factors for designing phosphors. In this report, we have investigated the correlation among the optical and emission properties of Ce-doped alkaline earth borate glasses with the Ce3+/(Ce3++Ce4+) ratio determined by X-ray absorption near-edge structure analyses. It is confirmed that the additional carbon increases the population of Ce3+, which is also suggested from the optical absorption edge, Eg opt, due to Ce and the quantum yield (QY). We have revealed that the Ce3+ concentration of the Sr-substituted glass is completely the same as that of the Ca-substituted one that exhibits the highest efficiency, even though the Ce3+ ratio is suggested to depend on the substitution spices from the Eg opt and QY. Therefore, we can conclude that not only the Ce3+ amount but also the local structures of Ce3+ affect the emission properties. In other words, the luminescent efficiency of the Ce3+ centers in amorphous materials strongly depends on the various local coordination states.

Journal

Journal of LuminescenceElsevier

Published: May 1, 2018

References

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