Rise and Decay of Photoluminescence in Upconverting Lanthanide-Doped Nanocrystals.

ABSTRACT: Nanocrystals (NCs) doped with lanthanides are capable of efficient photon upconversion, i.e., absorbing long-wavelength light and emitting shorter-wavelength light. The internal processes that enable upconversion are a complex network of electronic transitions within and energy transfer between dopant centers. In this work, we study the rise and decay dynamics of upconversion emission from β-NaYF₄ NCs codoped with Er³⁺ and Yb³⁺. The rise dynamics of the red and green upconverted emissions are nonlinear, reflecting the nonlinear nature of upconversion and revealing the mechanisms that populate the emitting states. The excited-state decay dynamics are nonexponential. We unravel the underlying decay pathways using photonic experiments. These reveal the contrib

SUBMITTER: Vonk SJW 

PROVIDER: S-EPMC11483940 | biostudies-literature | 2024 Oct

REPOSITORIES: biostudies-literature