Issue 46, 2023

Upconversion enhancement through engineering the local crystal field in Yb3+ and Er3+ codoped BaWO4 along with excellent temperature sensing performance

Abstract

High-efficiency upconversion (UC) luminescence has been a hot topic in the development of optical materials. In this study, an extremely strong green UC is successfully achieved in the BaWO4:Yb3+/Er3+ phosphor through engineering the local environment around the luminescent centers, realized by Ca2+ doping. The green UC intensity of Ca2+ doped BaWO4:Yb3+/Er3+ is 6.5 and 2.3 times stronger than that of BaWO4:Yb3+/Er3+ and CaWO4:Yb3+/Er3+, respectively. Eu3+ ions are employed as the structure probe to detect the evolution of the crystal field symmetry with the increase of Ca2+ doping concentration, the results of which match well with the corresponding variation of the UC spectra. Meanwhile, the BaWO4:Yb3+/Er3+/Ca2+ exhibits excellent temperature sensing performance based on the fluorescence intensity ratio (FIR) between the thermally coupled 2H11/2 and 4S3/2 states of Er3+ ions. Its absolute sensitivity and relative sensitivity for optical thermometry can reach 1.21% K−1 and 1.31% K−1, outperforming the majority of the same type optical thermometers. The temperature resolution of the present thermometer remains lower than 0.1 K within the temperature range of 298 K to 573 K. The intense green UC luminescence along with the outstanding thermal properties makes the BaWO4:Yb3+/Er3+ phosphor a promising candidate for optical thermometry.

Graphical abstract: Upconversion enhancement through engineering the local crystal field in Yb3+ and Er3+ codoped BaWO4 along with excellent temperature sensing performance

Supplementary files

Article information

Article type
Paper
Submitted
17 Sep 2023
Accepted
08 Nov 2023
First published
09 Nov 2023

J. Mater. Chem. C, 2023,11, 16310-16315

Upconversion enhancement through engineering the local crystal field in Yb3+ and Er3+ codoped BaWO4 along with excellent temperature sensing performance

G. Xiang, Z. Liu, Z. Yang, Y. Wang, L. Yao, S. Jiang, X. Zhou, L. Li, X. Wang and J. Zhang, J. Mater. Chem. C, 2023, 11, 16310 DOI: 10.1039/D3TC03386D

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