Long-lived Photon Upconversion Phosphorescence in RbCaF₃:Mn²⁺,Yb³⁺ and the Dynamic Color Separation Effect.

ABSTRACT: The development of luminescence materials with long-lived upconversion (UC) phosphorescence and long luminescence rise edge (LRE) is a great challenge to advance the technology of photonics and materials sciences. The lanthanide ions-doped UC materials normally possess limited UC lifetime and short LRE, restricting direct afterglow viewing in visual images by the naked eye. Here, we show that the RbCaF₃:Mn²⁺,Yb³⁺ UC luminescence material generates a long UC lifetime of ∼62 ms peaking at 565 nm and an ultralong LRE of ∼5.2 ms. Density functional theory calculations provide a theoretical understanding of the Mn²⁺-Yb³⁺ aggregation in the high-symmetry RbCaF₃ host lattice that enables the formation of the long-lived UC emission

SUBMITTER: Song E 

PROVIDER: S-EPMC6718810 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature