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ARTICLE

Upconversion photoluminescence and optical temperature sensing properties of PbNb₂O₆:Yb³⁺, Ln³⁺ (Ln³⁺=Er³⁺/Ho³⁺) ceramics

Z. Liu^a,*, K. Li^b, Y. Sun^c, R. X. Wang^a

a School of Science, Jinling Institute of Technology, Nanjing 211168, China
b Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices，Huizhou University, Huizhou 516001, Guangdong, China
c Precision Acousto-optic Instrument Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China

* Corresponding Author:

Chalcogenide Letters 2024, 21(12), 977-988. https://doi.org/10.15251/CL.2024.2112.977

Received 03 October 2024; Accepted 06 December 2024;

Abstract

Through conventional solid-state sintering process, PbNb₂O₆:Yb³⁺, Ln³⁺ (Ln³⁺=Er³⁺/Ho³⁺) ceramics have been fabricated. The structural information of synthesized ceramics was obtained via X-ray diffraction. Scanning electron microscopy was utilized to investigate their morphological properties. The investigation of upconversion photoluminescence properties of the synthesized ceramics was conducted by analyzing upconversion emission spectra upon excitation with 980 nm light. Power dependence studies confirmed the presence of two-photon absorption processes in both PbNb₂O₆:Yb³⁺, Er ³⁺ and PbNb₂O₆:Yb³⁺+, Ho³⁺ ceramics. Temperature-dependent experiments from 303 K to 513 K demonstrated significant variations in emission intensities and fluorescence intensity ratios (FIR), enabling the assessment of temperature changes. The absolute sensitivity of PbNb₂O₆ ceramic co-doped with Yb³⁺, Er ³⁺ ions reached its maximum value of 0.0056 K^-1 at 513 K, while the maximum relative sensitivity of 0.697% K^-1 was recorded at 339 K. For PbNb₂O₆ ceramic co-doped with Yb³⁺, Ho³⁺ ions, the maximum values of absolute and relative sensitivities were 0.048 K^-1 and 0.8% K^-1 at 513 K and 473 K, respectively. These results highlight the potential applications of PbNb₂O₆:Yb³⁺, Ln³⁺ (Ln³⁺=Er³⁺/Ho³⁺) ceramics in advanced temperature sensing based on photoluminescence.

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