Upconversion nanoparticles (UCNPs) can convert tissue‐penetrable nearinfrared light into UV emission, making them promising as transducers for photoactivation in biology. However, the choice of the UV emitting UCNPs is limited and their NIR‐to‐UV efficiency is low. G. Han and co‐workers have addressed this issue by developing a family of CaF2‐coated UCNPs with tunable UV enhancement. As reported , such design outperforms known optimal UCNPs and in situ realtime live‐cell photoactivation is recorded for the first time with such nanoparticles. This result is a potential game changer in photoactivation in living systems and a new tool for other biophotonic applications.

No abstract

Lanthanide-doped fluoride nanocrystals (NCs) are known to exhibit unique optical properties, such as upconversion and downconversion luminescence (UCL and DCL), which can be employed in various applications. In this work,...

No abstract