6533b7cefe1ef96bd1256f2a

RESEARCH PRODUCT

Defect Luminescence of LiBaF3 Perovskites

H.-j. FittingP. KulisMaris SpringisA. VeispalsI. Tale

subject

PhotoluminescenceMaterials scienceImpurityAbsorption bandExcited stateSpontaneous emissionLuminescenceAnisotropyMolecular physicsExcitation

description

Blue and red luminescence of undoped LiBaF3 crystals was studied. A broad, isotropic photoluminescence band centered at 410 nm can be excited by 210 nm — 275 nm light in as grown crystals. After X-irradiation at RT a new narrower, anisotropic luminescence band appears at 425 mn which has an additional excitation band at 290 nm. The X-irradiation also creates the F- type centres and anisotropic centres with an absorption band at 630 nm and a luminescence band at 700 nm. No F- centre luminescence is observed. All the other centres mentioned act as radiative recombination centers as well. It is speculated that the origin of the blue luminescence is due to oxygen defects and that the red luminescence is due to defects of a complex structure involving Fe impurity.

yearjournalcountryeditionlanguage
2000-01-01
https://doi.org/10.1007/978-94-011-4030-0_51