Issue 38, 2024

Thermal enhancement of the upconversion luminescence of Zn2+ ion-doped KYb(MoO4)2:Er3+ phosphors for multimode temperature sensing

Abstract

Pure phase KYb(MoO4)2:Er3+ phosphors doped with different concentrations of Zn2+ ions were prepared by a high temperature solid phase method. Based on XRD refinement results, some Yb3+ ions and K+ ions were replaced by Zn2+ ions. The upconversion luminescence (UCL) spectra of 980 nm laser excitation show that KYb(MoO4)2:Er3+ emits single near-infrared light and KYb(MoO4)2:Er3+,Zn2+ presents multi-modal UCL emission. The optimal doping concentration of Zn2+ ions was 0.08. Meanwhile, the energy transfer process of UCL was revealed by optical characterization methods. The temperature sensing characteristics of the phosphor were tested in the temperature range of 298–523 K. The phosphor exhibits thermal enhancement. Variable temperature XRD from 298 K to 523 K resulted in a slight enlargement and expansion in the refinement of cell parameters and volume. This indicates that thermal enhancement is attributed to the lattice structure distortion caused by doping of Zn2+ ions, not caused by phase transformation and negative thermal expansion. In addition, the relative and absolute sensitivities of the phosphor were 1.1% K−1 at 298 K and 1.73% K−1 at 348 K, respectively. This provides a new approach and opens up new avenues for the theory of thermally enhanced luminescence.

Graphical abstract: Thermal enhancement of the upconversion luminescence of Zn2+ ion-doped KYb(MoO4)2:Er3+ phosphors for multimode temperature sensing

Article information

Article type
Paper
Submitted
12 Jul 2024
Accepted
09 Sep 2024
First published
19 Sep 2024

J. Mater. Chem. C, 2024,12, 15781-15792

Thermal enhancement of the upconversion luminescence of Zn2+ ion-doped KYb(MoO4)2:Er3+ phosphors for multimode temperature sensing

J. Hu, D. Zhu, Y. Wu, K. Guo, C. Ding, R. Fan, C. Dong, W. Jin and Y. Liu, J. Mater. Chem. C, 2024, 12, 15781 DOI: 10.1039/D4TC02959C

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