(alpha-NaYbF4:Tm(3+))/CaF2 core/shell nanoparticles with efficient near-infrared to near-infrared upconversion for high-contrast deep tissue bioimagingOrthopedics and Physical Rehabilitation Publications and Presentations
UMMS AffiliationDepartment of Orthopedics and Physical Rehabilitation
Medical Subject HeadingsAnimals; Calcium Fluoride; Contrast Media; Femur; Fluorides; Infrared Rays; Materials Testing; Mice; Microscopy, Fluorescence; Molecular Conformation; Muscle, Skeletal; Nanoparticles; Particle Size; Porosity; Rats; Swine; Yttrium
AbstractWe 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).
Rights and PermissionsCitation: ACS Nano. 2012 Sep 25;6(9):8280-7. Epub 2012 Sep 4. Link to article on publisher's site
Related ResourcesLink to Article in PubMed
Citation InformationGuanying Chen, Jie Shen, Tymish Y. Ohulchansky, Nayan J. Patel, et al.. "(alpha-NaYbF4:Tm(3+))/CaF2 core/shell nanoparticles with efficient near-infrared to near-infrared upconversion for high-contrast deep tissue bioimaging" Vol. 6 Iss. 9 (2012) ISSN: 1936-0851 (Linking)
Available at: http://works.bepress.com/jie_song/27/