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A Bright NIR-II Fluorescence Probe for Vascular and Tumor Imaging

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Multi-Mode Lanthanide-Doped Ratiometric Luminescent Nanothermometer for Near-Infrared Imaging within Biological

Hao Li¹, Esmaeil Heydari², Yinyan Li¹

¹Key Laboratory of Rare Earth Optoelectronic Materials and Devices of Zhejiang Province, China Jiliang University, Hangzhou 310018, China.

Nanomaterials (Basel, Switzerland)

|January 8, 2023

Summary

Lanthanide-doped core-shell nanoparticles offer reliable, non-contact temperature measurement for biomedical applications. These nanomaterials enable multi-mode luminescence and near-infrared imaging, enhancing bio-imaging capabilities.

Keywords:

fluoride nanocrystals lanthanide dopant photothermal therapy ratiometric thermometry upconversion

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Area of Science:

Materials Science
Nanotechnology
Biomedical Engineering

Background:

Ratiometric luminescent thermometers provide accurate, non-contact temperature measurements.
Lanthanide-doped nanomaterials offer multi-mode luminescence for temperature sensing.
Near-infrared (NIR) photon penetration is crucial for deep-tissue bio-imaging and photothermal applications.

Purpose of the Study:

To develop core-shell nanomaterials for multi-mode ratiometric optical thermometry.
To investigate lanthanide ion doping (Er3+/Yb3+/Nd3+) in Ba2LuF7/Ba2LaF7 core-shell structures.
To enable non-contact temperature measurement at various tissue depths using NIR emission.

Main Methods:

Synthesis of Ba2LuF7:Er3+/Yb3+/Nd3+@Ba2LaF7 core-shell nanoparticles.
Characterization of nanoparticle structure and luminescence properties.
Evaluation of ratiometric thermometry performance under different excitation wavelengths (980 nm and 808 nm).

Main Results:

Green upconversion luminescence observed under both 980 nm and 808 nm excitation.
Distinct emission band patterns obtained under different excitation sources.
Successful demonstration of multi-mode ratiometric optical thermometers for temperature measurement in the NIR window.

Conclusions:

The developed core-shell NIR nanoparticles exhibit potential for advanced bio-imaging.
These nanoparticles can accurately record temperature for biomedical applications.
The study highlights the utility of lanthanide-doped nanomaterials in optical thermometry and imaging.