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Published on: May 1, 2014
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NIR-II upconversion nanomaterials for biomedical applications.
Ranran Luo1, Chenxi Zhang1, Zening Zhang1
1Department of Radiology, Second Affiliated Hospital of Chongqing Medical University, Chongqing 400010, China. lrr990710@163.com.
Nanoscale
|December 24, 2024
Summary
Upconversion nanomaterials offer advanced biomedical imaging by utilizing the NIR-II window for deeper tissue penetration and reduced background noise. This review highlights their preparation, applications, and future potential in diagnostics and treatment.
Area of Science:
- Nonlinear optics and nanomaterials science.
- Biomedical imaging and diagnostics.
- Photonics and spectroscopy.
Background:
- Upconversion (UC) nanomaterials absorb low-energy photons for emission, offering advantages like photostability and enhanced tissue penetration.
- Conventional UC nanomaterials using visible light face limitations in tissue penetration and imaging quality due to absorption and scattering.
- Near-infrared-I (NIR-I) window (700-900 nm) UC nanomaterials improve penetration but still struggle with background signals.
Purpose of the Study:
- To review the latest advancements in upconversion nanomaterials specifically designed for the near-infrared-II (NIR-II) window (1000-1700 nm).
- To explore the preparation methods, applications in biomedical imaging, and biological contexts of NIR-II upconversion nanomaterials.
- To discuss current challenges and future prospects for NIR-II upconversion materials in biomedical research.
Main Methods:
- Literature review focusing on upconversion nanomaterials operating in the NIR-II spectral region.
- Analysis of synthesis and preparation techniques for NIR-II upconversion nanomaterials.
- Summarization of reported applications in biomedical imaging, disease diagnosis, and biomarker detection.
Main Results:
- Upconversion nanomaterials in the NIR-II region show significant potential for deep-tissue imaging due to superior penetration and reduced autofluorescence.
- Recent research focuses on novel preparation strategies to optimize quantum yield and stability for NIR-II applications.
- Emerging applications include in vivo imaging, drug delivery, and theranostics with enhanced signal-to-noise ratios.
Conclusions:
- Upconversion nanomaterials in the NIR-II window represent a promising frontier for high-resolution, deep-tissue biomedical imaging.
- Further research into synthesis optimization and targeted delivery systems is crucial for clinical translation.
- Overcoming challenges in material stability and signal detection will unlock the full potential of these materials for advanced diagnostics and therapeutics.
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