6533b839fe1ef96bd12a5972
RESEARCH PRODUCT
Self-trapped holes and recombination luminescence in LiBaF3 crystals
V. OgorodnikH.-j. FittingI. TaleV. TaleP. KulisUldis RogulisA. VeispalsMaris Springissubject
RadiationChemistryResonanceElectronThermoluminescenceMolecular physicslaw.inventionAfterglowNuclear magnetic resonancelawElectron paramagnetic resonanceLuminescenceInstrumentationQuantum tunnellingRecombinationdescription
Abstract We investigated electron paramagnetic resonance (EPR) angular dependencies, recombination afterglow and thermostimulated luminescence of undoped LiBaF3 crystals, X-irradiated at low temperatures. EPR parameters of the F2− molecule oriented along the [1 1 0] direction have been obtained. Based on the value of the g-shift Δg=g⊥−gII=0.02, characteristic for the VK-centres in similar perovskites, we propose that we indeed observed the VK-centres, not the H-centres. X-irradiation below 170 K results in creation of a long-time temperature-independent afterglow due to the tunnelling recombination between close electron and hole centres. The F-type electron centres and the VK as well as probably O2− centres are proposed to be the tunnelling recombination partners, responsible for the 4.1 and 3.15 eV luminescence bands, respectively.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2001-10-01 | Radiation Measurements |