Sodium Assists Controlled Synthesis of Cubic Rare-Earth Oxyfluorides Nanocrystals for Information Encryption and Near-Infrared-IIb Bioimaging.

ABSTRACT: Rare-earth oxyfluoride (REOF) colloidal nanocrystals (NCs) suffer from a low photoluminescence efficiency due to their small size with poor crystallinity and a detrimental surface quenching effect. Herein, we introduce an innovative approach that involves doping sodium ions into REOF NCs to produce monodisperse, size-controllable, well-crystallized, and highly luminescent colloidal REOF core/shell NCs. The Na⁺ doping allows for successfully synthesizing the cubic REOF NCs with a tunable size from 6 to 30 nm. Further fabrication of the core/shell NCs doped with Na⁺ results in enhancements up to 1062 (Ho³⁺), 1140 (Er³⁺), and 2212 (Tm³⁺) folds in upconversion luminescence and 17.7 folds (Er³⁺) in downconversion luminescence com

SUBMITTER: Wang Q 

PROVIDER: S-EPMC11688664 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature