Electron paramagnetic resonance studies of photorefractive crystals II: Fe³⁺ doped Bi₁₂SiO₂₀ with copper vapour laser illumination in 10-100 K range

Abstract

Photo-induced charge transfer and its kinetics were investigated in Bi₁₂SiO₂₀ in 10-300 K temperature range, using EPR of Fe³⁺ centre, underin situ illumination with copper vapour laser (CVL). The decay kinetics was found to follow double exponential behaviour. Relaxation of the photo-induced electron transfer to the preillumination condition occurred even at 10 K. Shallow traps were, therefore, associated with the electron trapping, leading to a better understanding of the fast photorefractive response of BSO.