Synthesis and luminescent properties of lanthanide-doped ScVO 4 microcrystals

Luminescence, energy transfer, colour modulation and up-conversion mechanisms of Yb3+, Tm3+ and Ho3+ co-doped Y6MoO12

“…Photon up-conversion (UC) is an anti-Stokes process in which the absorption of multiple low-energy photons leads to the emission of a photon with a higher energy than the excitation photon. [1][2][3][4][5][6][7] Rare-earth-doped up-conversion nanocrystals have garnered considerable attention because of their efficient energy transfer, good luminescence properties, and optical absorption ability, [8][9][10][11] which have signicant applications in the elds of solid-state laser, 12,13 multicolour display, 14,15 optical data storage, 16,17 optical communication, 18,19 and optical sensing. 20,21 Ye and co-worker discovered a new non-contact optical material Ba 3 Y 4 O 9 for temperature measurement, and they achieved high sensitivity over a wide measuring temperature range.…”

Design for Brighter Photon Upconversion Emissions via Energy Level Overlap of Lanthanide Ions

“…Although lanthanide-doped upconversion nanomaterials possess great potential in temperature probing, deep-tissue bioimaging, theranostics, three-dimensional display, super-resolution nanoscopy, and lasing, − the inherently low photon upconversion efficiency has severely limited their practical applications. Recently, considerable efforts have been devoted toward enhanced upconversion luminescence in approaches such as surface plasmon coupling, design of varied host lattice structures with optimal crystal parameters, formation of nanoclusters, energy transfer modulation, fabrication of core–shell nanostructures, as well as organic dye sensitization. − For example, Zhao obtained 197-fold enhanced red-to-green intensity ratio by codoping Mn 2+ into α-phase NaYF 4 :Yb/Er nanoparticles, while Han realized red emissions from α-NaYbF 4 :Er­(2 mol%)@CaF 2 nanoparticles that are 15 times stronger than those of routinely designed β-NaYF 4 :Yb/Er­(20/2 mol%)@β-NaYF 4 nanoparticles …”