Internal OH^- induced cascade quenching of upconversion luminescence in NaYF₄:Yb/Er nanocrystals.

ABSTRACT: Internal hydroxyl impurity is known as one of the main detrimental factors affecting the upconversion (UC) efficiency of upconversion luminescence (UCL) nanomaterials. Different from surface/ligand-related emission quenching which can be effectively diminished by, e.g., core/shell structure, internal hydroxyl is easy to be introduced in synthesis but difficult to be quantified and controlled. Therefore, it becomes an obstacle to fully understand the relevant UC mechanism and improve UC efficiency of nanomaterials. Here we report a progress in quantifying and large-range adjustment of the internal hydroxyl impurity in NaYF₄ nanocrystals. By combining the spectroscopy study and model simulation, we have quantitatively unraveled the microscopic interactions underlying UCL quenching

SUBMITTER: Feng Y 

PROVIDER: S-EPMC8134431 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature