Stable formation of primary F and aggregate F2and F3+colour centres in LiF crystals irradiated with a X-ray table-top source was investigated by optical absorption and photoluminescence measurements as a function of the irradiation dose. The F absorption band intensity follows a power law behaviour as a function of dose with a single exponent equal to 0.77, a value in excellent agreement with the predictions of a unified model for colour centres formation. The aggregate defects photoluminescence response appears suitable for applications in high dynamic range imaging plate X-ray detectors based on photoluminescence of coloured LiF. The choice of polycrystalline LiF thin films grown on different substrates allows one to obtain high resolved images even when more penetrating X-rays are used, as the colour centres formation is limited in depth by the film total thickness. © 2010 IOP Publishing Ltd.
|Publication status||Published - 2010|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
Montereali, R. M., Almaviva, S., Bonfigli, F., Franzini, I., Pelliccia, D., Cedola, A., & Lagomarsino, S. (2010). F and F-aggregates colour centres in lithium fluoride for high spatial resolution x-ray imaging. https://doi.org/10.1088/1742-6596/249/1/012003