Issue 35, 2024

Molten salt synthesized LaTa7O19:Er3+/Yb3+ with superior upconversion luminescence using KCl flux

Abstract

A LaTa7O19(LTO):Er3+/Yb3+ upconversion luminescence (UCL) phosphor with a hexagonal structure was successfully prepared using a molten salt synthesis method using KCl as solvent. Increasing the holding temperature from 825 to 1150 °C, the LTO structure is transformed towards K2LaTa5O15(KLTO). At 1150 °C, the sample is pure phase KLTO:Er3+/Yb3+. Increasing the holding time at 825 °C from 2 to 48 h, the LTO phase first increases and then decreases. Increasing the KCl flux mass at 825 °C for 24 h, the KLTO structure is first transformed towards LTO, then the KLTO structure increases, and LTO:Er3+/Yb3+ grain size decreases. The highest green UCL integral intensity of LTO:Er3+/Yb3+ reached 89% of β-NaYF4:Er3+/Yb3+. The maximum relative temperature sensitivity of 0.866% K−1 is reached by using the luminescence intensity ratio (LIR) technique. LTO:Er3+/Yb3+ phosphors with excellent pure green UCL can be prepared by molten salt with KCl flux, which can be applied in display and temperature sensing.

Graphical abstract: Molten salt synthesized LaTa7O19:Er3+/Yb3+ with superior upconversion luminescence using KCl flux

Supplementary files

Article information

Article type
Paper
Submitted
23 Jun 2024
Accepted
29 Jul 2024
First published
30 Jul 2024

J. Mater. Chem. C, 2024,12, 13875-13883

Molten salt synthesized LaTa7O19:Er3+/Yb3+ with superior upconversion luminescence using KCl flux

X. Yan, Y. Cao, X. Wang, J. Zhang, S. Xu, G. Li and B. Chen, J. Mater. Chem. C, 2024, 12, 13875 DOI: 10.1039/D4TC02625J

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