White Up-Conversion Luminescence in Rare-Earth-Ion-Doped YAlO₃ Nanocrystals

Abstract

Room-temperature bright white up-conversion (UC) luminescence in Yb3+/Er3+/Tm3+ ion-doped YAlO3 nanocrystals was achieved under diode laser excitation of 974.5 nm. The white light consists of the blue (1G4 → 3H6 of Tm3+), green (2H11/2/ 4S3/2 → 4I15/2 of Er3+), and red (1G4 → 3F4 of Tm3+ and 4F9/2 → 4I15/2 of Er3+) UC emissions. The UC mechanisms were proposed based on spectral, pump power dependence and kinetic analyses. The white light may be a possible candidate for applications in the field of lighting, displays, and photonics.