Upconversion-pumped luminescence efficiency of rare-earth-doped hosts sensitized with trivalent ytterbium

Infrared luminescence of transparent glass ceramic containing Er3+:NaYF4 nanocrystals

“…As known to us, the main reason for the broadening is the local crystal field symmetry at the rare-earth ion site, and the inhomogeneous broadening is mainly due to the local structure and the coordination configuration of the luminescence ion sites [8]. The first stage corresponds to the crystallization of the glass phase, herein parts of Er 3+ ions incorporate into the precipitated NaYF 4 nanocrystals that possess high local symmetry than the oxide glass matrix, the much-limited distribution of luminescence ion sites in the NaYF 4 crystals finally narrows the emission band.…”

Upconversion luminescence in erbium doped transparent oxyfluoride glass ceramics containing hexagonal NaYF4 nanocrystals

“…Two polymorph modifications of NaYF 4 exist, namely, ␣-NaYF 4 (cubic) and ␤-NaYF 4 (hexagonal) [20]; the efficiency of the UCL in hexagonal NaYF 4 is at least one order of magnitude higher than in its cubic counterpart [18]. Unfortunately, ␤-NaYF 4 cannot be obtained as a single crystal [21], which limits its application in the cases when transparency is required.…”

A numerical method for solving gain characteristics of Er3+/Yb3+ codoped waveguide amplifiers

“…The increased photoluminescence or upconversion fluorescence emitted from those ions codoped with Yb 3+ , has been demonstrated [1][2][3][4][5][6][7][8]. The greater part of these studies has been focused on erbium-ytterbium codoped materials because of their uses as gain media source in the third window for optical communications [9].…”