title: A UV-blocking polymer shell prevents one-photon photoreactions while allowing multi-photon processes in encapsulated upconverting nanoparticles.
abstract: Sun block for nanoparticles: Unintentional photorelease triggered by UV light is a problem in photodynamic therapy. Encapsulating upconverting nanoparticles containing photoswitches in a UV-blocking amphiphilic polymer shuts down the one-photon process and only allows two-photon-driven photochemistry. Thus, UV light is blocked while NIR light can reach the nanoparticle core and trigger photorelease.
authors.affiliation: Department of Chemistry and 4D LABS, Simon Fraser University, 8888 University Drive, Burnaby, BC V5A 1S6 (Canada).
authors.forename: Tuoqi
authors.initials: T
authors.lastname: Wu
authors.forename: Madeleine
authors.initials: M
authors.lastname: Barker
authors.forename: Khaled M
authors.initials: KM
authors.lastname: Arafeh
authors.forename: John-Christopher
authors.initials: JC
authors.lastname: Boyer
authors.forename: Carl-Johan
authors.initials: CJ
authors.lastname: Carling
authors.forename: Neil R
authors.initials: NR
authors.lastname: Branda
keywords: UV-blocking polymers; multi-photon excitation; nanoparticles; photoswitches; upconversion