By means of magnetic resonance spectroscopies we investigate processes of charge trapping in optical, luminescence and scintillation materials, physics of their point defects. Understanding of electron and hole trapping in wide band-gap scintillation materials and the nature of corresponding lattice defects is of crucial importance to optimize the materials performance close to their intrinsic limits. Electron Paramagnetic Resonance (EPR) allows not only to detect impurity ions or lattice defects in a material but also to determine their local structure and interaction with neighborhood. In addition to EPR, Nuclear Magnetic Resonance (NMR) provides unique approach to quantify site occupancy by ions in a material.
EPR spectrum of the W5+ center in PbWO4 created by X-ray irradiation showing spectral lines from 207Pb and 183W isotopes.
