Self-calibrated optical thermometer LuNbO4:Pr3+/Tb3+ based on intervalence charge transfer transitions. Issue 10 (28th August 2018)

• Record Type: Journal Article
• Authors: Wu, Yanfang; Suo, Hao; Zhao, Xiaoqi; Zhou, Ziwei; Guo, Chongfeng
• Is Part Of: Inorganic chemistry frontiers. Volume 5:Issue 10(2018)
• Page Start: 2456
• Page End: 2461
• Publication Date: 2018-08-28
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8qi00755a
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : High sensitivity thermometer LuNbO4 :Pr 3+ /Tb 3+ based on intervalence charge transfer transitions. Abstract : A Pr 3+ /Tb 3+ co-doped LuNbO4 phosphor was synthesized as a self-calibrated optical thermometer using a high-temperature solid-state method, and its structure and luminescent property were elaborately investigated. Under intervalence charge transfer (IVCT) excitation at 305 nm, the sample LuNbO4 :Pr 3+ /Tb 3+ exhibited several bands in the green and red regions, originating from characteristics transitions of Pr 3+ and Tb 3+ ions. Through monitoring thermo-responsive emission intensity ratios from the 1 D2 → 3 H4 (Pr 3+ ) and 5 D4 → 7 F5 (Tb 3+ ) transitions, sensitive thermometry with good signal discriminability was achieved in phosphor LuNbO4 :Pr 3+ /Tb 3+ owing to a significant difference in thermal activation energy between Pr 3+ and Tb 3+ under IVCT excitation. Moreover, the maximum absolute sensitivity and relative sensitivity reached about 0.024 K −1 at 493 K and 1.26% K −1 at 463 K, respectively, for the LuNbO4 :Pr 3+ /Tb 3+ sample, which implies that the present phosphor could be considered as a promising candidate for self-calibrated optical thermometers.