Effect of ligand environment of rare-earth ions on temperature measurement performance of SrAO4:xEu3+ (A = Mo and W) phosphors. Issue 24 (15th December 2022)

• Record Type: Journal Article
• Authors: Gao, Huabo; Molokeev, Maxim S.; Chen, Qi; Yang, Xuening; Wang, Xinjing; Ma, Bin
• Is Part Of: Ceramics international. Volume 48:Issue 24(2022)
• Page Start: 36835
• Page End: 36844
• Publication Date: 2022-12-15
• Subjects: Luminescent thermometer -- Ligand environment -- Temperature measurement performance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.08.247
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Molybdate and tungstate with scheelite-type structure are excellent self-luminescent materials, which can be used as ideal hosts for the doping of rare-earth ions. In this study, a series of Eu 3+ -activated SrAO4 (A = Mo and W) phosphors were successfully synthesized, and their crystal structures, photoluminescence properties, and temperature measurement performance were analyzed in detail. These phosphors were excited by UV light (291 nm and 247 nm, respectively), with clear energy transfer (ET) (MoO4 2− →Eu 3+ or WO4 2− →Eu 3+ ). According to fluorescence intensity ratio (FIR) and Judd–Ofelt (J–O) theory, compared to SrWO4 :0.01Eu 3+ phosphor, SrMoO4 :0.01Eu 3+ phosphor exhibited better thermal stability, with relatively low Sa value (maximum values were 5.082 %K −1 and 20.74 %K −1, respectively), and their Sr values were not significantly different (maximum values were 0.864 %K −1 and 0.83 %K −1, respectively). Sa value was negatively correlated to central asymmetry of Eu 3+, but the optimal Sr value tended to be more suitable for central asymmetry of Eu 3+ . In addition, Eu 3+ exhibited stronger central asymmetry as well as covalency of Eu–O bond in SrMoO4 . Results reveal that SrMoO4 :xEu 3+ and SrWO4 :xEu 3+ can be used for luminescent thermometers.