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In this paper, a very simple method was used to synthesize ligand-free luminous hydrogels doped with Tb3+ and Eu3+. The hydrogels exhibit red (615 nm), green (544 nm) and blue (425 nm) emissions derived from Tb3, Eu3+ and defects, respectively. Effective energy transfer from Tb3+ to Eu3+ is observed. We apply these ligand-free luminous hydrogels for temperature sensing for the first time. In surprise, the relative sensitivities are all very high (＞2 %/K) by using many kinds of fluorescence intensity ratios. In addition, with the increase of temperature, the emission color of the samples changes significantly (from orange-red to blue) which can be applied for visual temperature sensing. The above results infer that the ligand-free luminous hydrogels can be used as an eco-friendly visual temperature sensing material. © 2024 Elsevier B.V.
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Optical Materials
ISSN： 0925-3467
Year： 2024
Volume： 155
3 . 8 0 0
JCR@2023
CAS Journal Grade：3
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ESI Highly Cited Papers on the List： 0 Unfold All
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30 Days PV： 0
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