Please use this identifier to cite or link to this item:
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
Appears in Collections:Journal/Magazine Article

View full-text via PolyU eLinks SFX Query
Show full item record


Citations as of Nov 15, 2019


Last Week
Last month
Citations as of Nov 16, 2019

Page view(s)

Last Week
Last month
Citations as of Nov 13, 2019

Google ScholarTM



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.