Six-photon upconverted excitation energy lock-in for ultraviolet-C enhancement.

ABSTRACT: Photon upconversion of near-infrared (NIR) irradiation into ultraviolet-C (UVC) emission offers many exciting opportunities for drug release in deep tissues, photodynamic therapy, solid-state lasing, energy storage, and photocatalysis. However, NIR-to-UVC upconversion remains a daunting challenge due to low quantum efficiency. Here, we report an unusual six-photon upconversion process in Gd³⁺/Tm³⁺-codoped nanoparticles following a heterogeneous core-multishell architecture. This design efficiently suppresses energy consumption induced by interior energy traps, maximizes cascade sensitizations of the NIR excitation, and promotes upconverted UVC emission from high-lying excited states. We realized the intense six-photon-upconverted UV emissions at 253 nm under 808 nm ex

SUBMITTER: Su Q 

PROVIDER: S-EPMC8285497 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature