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Keywords:

  • upconversion;
  • nanomaterials;
  • NIR-triggered release;
  • caged nitric oxides;
  • photoactivation
Thumbnail image of graphical abstract

Lanthanide-doped upconversion nanoparticles (UCNPs) mediate nitric oxide uncaging from Roussin's black salt anion Fe4S3(NO)7 using NIR light from a simple diode laser operating continuously at 980 nm. This result offers a new paradigm for applications of multi-photon absorption in the therapeutic delivery of NO.