Long-lasting phosphorescence in Ce3+-doped Ca2Al2SiO7 and CaYAl3O7 crystals

Abstract

Long-lasting phosphorescence is observed in Ce3+-doped Ca2Al2SiO7 (CASM) and CaYAl3O7 (CYAM) crystals at room temperature. UV irradiation at 365 nm produces broadband emissions with peaks at 417 nm for CASM and 425 nm for CYAM, which persist for not less than 1 h after the removal of the irradiating light. Based on the time dependence of the intensity of the phosphorescence, the long-lasting phosphorescence in these crystals is considered to be due to the electron–hole recombination at shallow traps, which occurs by a thermally activated process.

Luminescent properties of Eu2+-activated SrLaGa3S6O phosphor

“…Malinowski et al [15] have studied the spectroscopy properties of Dy 3+ -doped SrLaGa 3 O 7 crystals. Long-lasting phosphorescences have also been reported recently in CaYAl 3 O 7 :Ce 3+ (CYAM) [16,17], CaYAl 3 O 7 :Eu 2+ , Dy 3+ [18] and CaGdAl 3 O 7 :Eu 2+ , Dy 3+ [18] melilite crystals. Flahaut and co-workers [19] have shown that the thiogallates MLaGa 3 S 7 (M = Ca, Sr) and La 5/3 Ga 3 S 7 have the structure of melilite.…”

Luminescence properties of long-persistence silicate phosphors

“…Long-persistence phosphorescence in Ce 3+ doped Ca 2 Al 2 SiO 7 with a melilite structure has been reported recently by Kodama et al [2,3]. Ce 3+ functions as a high-efficiency emission center because 4f-5d transitions * Corresponding author.…”

Temperature dependence of structural and luminescence properties of Eu3+-doped Y2O3 red-emitting phosphor thin films by pulsed laser deposition

“…The slurry method is the most common method, in which phosphor powder is mixed with photosensitive chemicals and is patterned using photolithography techniques. For operating voltages greater than 2 kV, the screen is back coated with a thin layer of aluminium which acts as an optical reflector as well as a charge dissipater [20][21][22]. At operating voltage below 2 kV, the electron penetration depth is so small that the screens are left un-coated [23][24][25].…”