Issue 42, 2023

UVB upconversion of LiYO2:Ho3+,Gd3+ for application in luminescence thermometry

Abstract

Development of novel ultraviolet (UV) upconversion materials has been emerging as a hot research topic for application in tunable UV lasers, photocatalysis, sterilization, tagging, and most recently luminescence thermometry. We readily synthesized a series of Ho3+/Gd3+ co-doped LiYO2 upconversion phosphors by a traditional high-temperature reaction. Under excitation from a blue ∼445 nm laser, LiYO2:Ho3+,Gd3+ polycrystalline powders yield intense sharp ultraviolet B (UVB) upconversion luminescence from Gd3+ 6Pj (j = 7/2, 5/2, 3/2) excited states. By means of steady and dynamic photoluminescence spectra, we systematically investigated the involved two-photon absorption upconversion as well as the accompanying energy transfer processes between Ho3+ and Gd3+ ions in the LiYO2 host lattice. Interestingly, the distinguishable UVB luminescence constituents from Gd3+ 6Pj excited states exhibit sensitive temperature dependence in a 353–673 K range. Shedding light on thermal equilibria between Gd3+ 6Pj UV-emitting levels, their luminescence intensity ratios follow Boltzmann statistics for the application of new luminescence thermometry. For the scheme of 6P7/26P3/2 thermally coupled levels, it works over a temperature range of 373–673 K with a maximum relative sensitivity (Sr) of about 1.07% K−1 at 373 K, and its 6P7/26P5/2 counterpart works over 353–533 K with a maximum Sr of about 0.83% K−1 at 353 K. Overall, our study provides a new pathway to develop UV upconversion materials, and promotes the application of Gd3+-related UV luminescence constituents in sensitive temperature sensing over a wide temperature range.

Graphical abstract: UVB upconversion of LiYO2:Ho3+,Gd3+ for application in luminescence thermometry

Supplementary files

Article information

Article type
Paper
Submitted
01 Mezh. 2023
Accepted
11 Eost 2023
First published
07 Gwen. 2023

Dalton Trans., 2023,52, 15539-15548

UVB upconversion of LiYO2:Ho3+,Gd3+ for application in luminescence thermometry

S. Zhao, B. Li, T. Shen, F. Fang, S. Zhuang, D. Zhang and D. Yu, Dalton Trans., 2023, 52, 15539 DOI: 10.1039/D3DT01690K

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