Main group element ion doped zero-dimensional metal halide fluorescent sensing material as well as preparation method and application thereof

By preparing zero-dimensional metal halide fluorescent sensing materials doped with main group element ions and combining fluorescence lifetime and luminescence intensity detection, the problem of insufficient sensitivity of traditional fluorescent thermometers at extreme low temperatures is solved, and high-sensitivity temperature detection in the range of 4-70 K is achieved, which is suitable for extreme low temperature environments.

CN122144777APending Publication Date: 2026-06-05FUZHOU UNIV
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Patent Information

Application Number
CN202610279102.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-09
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing fluorescence thermometers suffer from reduced sensitivity and reliability at extreme low temperatures. Traditional fluorescence lifetime meters rely on the suppression of non-radiative relaxation processes in the low-temperature range, resulting in insufficient accuracy in low-temperature temperature detection. The photoluminescence mechanism of metal halide doped with main group element ions is unclear, which limits the temperature detection performance in the low-temperature region.

Method used

Zero-dimensional metal halide fluorescent sensing materials doped with main group element ions are used to achieve temperature detection in extreme low-temperature regions through dual-mode detection of fluorescence lifetime and luminescence intensity. The materials include Tl+, Sn2+, Sb3+, Bi3+, Te4+, and Se4+ as luminescence centers and are prepared by solvothermal method. The reaction conditions are controlled to obtain a highly sensitive temperature sensing material.

Benefits of technology

Achieving high-sensitivity temperature detection in extreme low-temperature regions, the material exhibits a relative sensitivity of up to 8.5% K⁻¹ in the range of 4-70 K, demonstrating excellent temperature detection performance and stability, and is suitable for low-temperature environments such as liquid helium and liquid nitrogen.

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Abstract

The invention provides a main group element ion doped zero-dimensional metal halide fluorescent sensing material as well as a preparation method and application thereof, and belongs to the technical field of fluorescent sensing materials. The main group element ion doped zero-dimensional metal halide microcrystal is synthesized through a solvothermal method, and the strong dependency difference of two thermal coupling energy levels of main group element ions on the temperature is utilized; the fluorescence lifetime and the fluorescence intensity of the zero-dimensional metal halide doped with the main group element ions show an obvious temperature-dependent evolution trend at a low temperature, and dual-mode (fluorescence intensity ratio / fluorescence lifetime) high-sensitivity temperature detection in a liquid helium temperature region can be realized. The synthesis method is simple and convenient in process, synthesis conditions are easy to control, and the obtained material shows extremely high relative sensitivity in a liquid helium temperature zone, has relatively high practical application value, can be used as a novel optical temperature sensing material and is used for temperature detection of various extreme temperature zones.
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