Publications by authors named "Ashot G Petrosyan"
The influence of Ca codoping on the optical absorption, photo-, radio-, and thermo-luminescence properties of YAlO :Ce (YAP:Ce) crystals has been studied for four different calcium concentrations ranging from 0 to 500 ppm. Ca codoping results in a partial oxidation of Ce into Ce , The luminescence time response under pulsed X-ray excitation of the Ce /Ce admixure clearly demonstrates the role of hole migration on both the rise time and the generally observed slow components. From an application point of view, Ca codoping significantly improves the timing performances, but the induced presence of Ce ions is also the cause of a reduction in scintillation efficiency.
View Article and Find Full Text PDFDeep traps can reduce memory effects of shallower ones in scintillators.
Phys Chem Chem Phys
January 2016
Article Synopsis
- X-ray induced luminescence sensitization was studied on three key scintillators: CsI:Tl, YAG:Ce, and LSO:Ce.
- A model was developed to explain the interactions between trapping and recombination of free charge carriers, effectively describing the sensitization behavior observed in the experiments.
- The research suggested a new approach to manage sensitization by intentionally adding deep traps, which could help mitigate the bright burn effect in these materials.