(alpha-NaYbF4:Tm(3+))/CaF2 core/shell nanoparticles with efficient near-infrared to near-infrared upconversion for high-contrast deep tissue bioimaging
Department of Orthopedics and Physical Rehabilitation; Department of Cell and Developmental Biology; Department of Biochemistry and Molecular Pharmacology
Medical Subject Headings
Animals; Calcium Fluoride; Contrast Media; Femur; Fluorides; Infrared Rays; Materials Testing; Mice; Microscopy, Fluorescence; Molecular Conformation; Muscle, Skeletal; Nanoparticles; Particle Size; Porosity; Rats; Swine; Yttrium
Bioimaging and Biomedical Optics | Cell Biology | Nanoscience and Nanotechnology | Orthopedics
We describe the development of novel and biocompatible core/shell (alpha-NaYbF(4):Tm(3+))/CaF(2) nanoparticles that exhibit highly efficient NIR(in)-NIR(out) upconversion (UC) for high contrast and deep bioimaging. When excited at ~980 nm, these nanoparticles emit photoluminescence (PL) peaked at ~800 nm. The quantum yield of this UC PL under low power density excitation (~0.3 W/cm(2)) is 0.6 +/- 0.1%. This high UC PL efficiency is realized by suppressing surface quenching effects via heteroepitaxial growth of a biocompatible CaF(2) shell, which results in a 35-fold increase in the intensity of UC PL from the core. Small-animal whole-body UC PL imaging with exceptional contrast (signal-to-background ratio of 310) is shown using BALB/c mice intravenously injected with aqueously dispersed nanoparticles (700 pmol/kg). High-contrast UC PL imaging of deep tissues is also demonstrated, using a nanoparticle-loaded synthetic fibrous mesh wrapped around rat femoral bone and a cuvette with nanoparticle aqueous dispersion covered with a 3.2 cm thick animal tissue (pork).
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Citation: ACS Nano. 2012 Sep 25;6(9):8280-7. Epub 2012 Sep 4. Link to article on publisher's site
Chen, Guanying; Shen, Jie; Ohulchansky, Tymish Y.; Patel, Nayan J.; Kutikov, Artem; Li, Zhipeng; Song, Jie; Pandey, Ravindra K.; Agren, Hans; Prasad, Paras N.; and Han, Gang, "(alpha-NaYbF4:Tm(3+))/CaF2 core/shell nanoparticles with efficient near-infrared to near-infrared upconversion for high-contrast deep tissue bioimaging" (2012). Orthopedics and Physical Rehabilitation Publications and Presentations. 147.