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Title: Unraveling the correlation between oxide-ion motion and upconversion luminescence in beta-La2Mo2O9:Yb3+,Er3+ derivatives
Authors: He, Q
Sun, MZ 
Kuang, XJ
Huang, BL 
Ye, S
Zhang, QY
Issue Date: 2017
Publisher: Royal Society of Chemistry
Source: Journal of materials chemistry C, 2017, v. 5, no. 42, p. 10965-10970 How to cite?
Journal: Journal of materials chemistry C 
Abstract: An optical approach is an alternative method to give insight into the oxide-ion motion in oxide-ion conductors. Herein, we illustrate the correlation between upconversion (UC) luminescence in Yb3+-Er3+ and oxide-ion motion in a beta-La-2(Mo,W)(2)O-9 series. The break points at similar to 150 degrees C in the logarithmic UC emission intensity ratio of I-525/I-660 or I-660/I-550 (the three emission peaks of Er3+) versus temperature imply oxide-ion jumps, whereas the slopes of these plots above 150 degrees C suggest the capacity of oxide-ion motion. Specifically, the larger the absolute slope values, the higher the oxide-ion conduction capacity. Due to the pinning feature of the Fermi level contributed by the Mo-O bonds in beta-La2Mo2O9 both with and without anion-Frenkel defects or W dopants, as revealed by density functional theory calculations, beta-La2Mo2O9 remains electronically insulating. Thus, the increase in activation energy and decline in conductivity with an increase in W contents at low temperature (<400 degrees C) are likely attributed to the higher barrier for the formation of new anion-Frenkel defects. This research gives another perspective on oxide-ion conductors via an optical probe.
ISSN: 2050-7526
EISSN: 2050-7534
DOI: 10.1039/c7tc03695g
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